[Lift] Re: Scala to JavaScript DSL ...

[Marius]

Let me know when you have something.

Br's,
Marius

On Dec 17, 8:58 am, Naftoli Gugenheim  wrote:
> I'm thinking of an approach to writing a DSL with a much cleaner syntax. I'll 
> try to put something together.
>
> -
>
> Marius Danciu wrote:
>
> All,
>
> I just want to see if there is any interest in the approach discussed here.
> As you know Lift has some interesting support for building JavaScript
> constructs from Scala code usig JsExp, JsCmd etc classes. I used quite a lot
> this support and it's great but if your JS code that you want to send down
> to the browser (say as an Ajax or Comet partial update response) gets a bit
> more complicated then constructing the JS fragment leads IMO to some
> cumbersome Scala code. I found myselft in quite a few situation to use JsRaw
> to write the JavaScript fragment in order for the code reader to understand
> what JavaScript code will be generated. But of course with JsRaw we put
> everything into a String so I'm not a big fan of this approach. So I started
> to define a JavaScript like "DSL" that IMO is closer to JavaScript form.
> Attached is a source code smaple of how this looks like, so for instance we
> can have something like:
>
> val js = JsFunc('myFunc, 'param1, 'param2) {
>     JsIf('param1 __< 30) {
>         Var('home) := Wrap(234 __- 3) __/ 2 `;`
>         Var('someArray) := JsArray(1, 2, 3, 4, 5) `;`
>         'myFunc(1, 2, "do it", 'home) `;`
>         $("#myID") >> 'attr("value", "123") `;`
>       } ~
>       JsForEach(Var('i) in 'someArray) {
>         'console >> 'log("Hi there " __+ 'i) `;`
>       } ~
>       JsAnonFunc('arg1, 'arg2) {
>        'alert("Anonymous function " __+ 'arg1 __+ 'arg2)
>       }(1, 2) `;`
>     }
>
>     println(js.toJs)
>
> this yields the following JavaScript code:
>
> function myFunc( param1, param2 ) {
> if (param1 < 30) {
> var home = ( 234 - 3 ) / 2;
> var someArray = [ 1, 2, 3, 4, 5 ];
> myFunc(1, 2, "do it", home);
> $("#myID").attr("value", "123");}
>
> for (var i in someArray) {
> console.log("Hi there " + i);}
>
> function ( arg1, arg2 ) {
> alert("Anonymous function " + arg1 + arg2)
>
> }(1, 2);
> }
>
> ... ok I just droped nonsense code in there for exemplification. A few
> words:
>
> 1. JsIf, JsForEach describe JavaScript if and for(each) statements
> 2. Functions like __<, __>, ... __+, __- are function that alows definition
> of boolean and/or algebraic expressions.
> 3. Wrap just wraps an expression into ()
> 4. Var defined a variable
> 5 := defines an assignment
> 6. JsFunc declares a JS function
> 7. JsAnonFunc declares an anonymous function
> 8. 'myFunc(1, 2, "do it", 'home)  is simply a javascript function invocation
> by providing 4 parameter.
> 9. ~ is just a function that chains statements that don;t necessarily end in
> ;
>
> Do you think that something like this would be usable in Lift?
>
> Br's,
> Marius
>
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[Lift] Re: Latest API Documentation

[Vesa]

I would also appreciate aggregated docs. It would be great to have
these at least for the M-releases..

- Vesa

On 7 marras, 05:47, aw  wrote:
> OK, so I can go tohttp://scala-tools.org/mvnsites/liftweb-1.1-7/
> but I am not finding a comprehensive ScalaDoc similar to what is
> available here:http://scala-tools.org/scaladocs/liftweb/1.0/
>
> It is hard (and SLOW) for me to figure out which component a class/
> object might reside, and find its corresponding ScalaDoc...  Or am I
> not seeing it?

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Re: [Lift] Scala to JavaScript DSL ...

[Naftoli Gugenheim]

I'm thinking of an approach to writing a DSL with a much cleaner syntax. I'll 
try to put something together.

-
Marius Danciu wrote:

All,

I just want to see if there is any interest in the approach discussed here.
As you know Lift has some interesting support for building JavaScript
constructs from Scala code usig JsExp, JsCmd etc classes. I used quite a lot
this support and it's great but if your JS code that you want to send down
to the browser (say as an Ajax or Comet partial update response) gets a bit
more complicated then constructing the JS fragment leads IMO to some
cumbersome Scala code. I found myselft in quite a few situation to use JsRaw
to write the JavaScript fragment in order for the code reader to understand
what JavaScript code will be generated. But of course with JsRaw we put
everything into a String so I'm not a big fan of this approach. So I started
to define a JavaScript like "DSL" that IMO is closer to JavaScript form.
Attached is a source code smaple of how this looks like, so for instance we
can have something like:


val js = JsFunc('myFunc, 'param1, 'param2) {
JsIf('param1 __< 30) {
Var('home) := Wrap(234 __- 3) __/ 2 `;`
Var('someArray) := JsArray(1, 2, 3, 4, 5) `;`
'myFunc(1, 2, "do it", 'home) `;`
$("#myID") >> 'attr("value", "123") `;`
  } ~
  JsForEach(Var('i) in 'someArray) {
'console >> 'log("Hi there " __+ 'i) `;`
  } ~
  JsAnonFunc('arg1, 'arg2) {
   'alert("Anonymous function " __+ 'arg1 __+ 'arg2)
  }(1, 2) `;`
}

println(js.toJs)

this yields the following JavaScript code:


function myFunc( param1, param2 ) {
if (param1 < 30) {
var home = ( 234 - 3 ) / 2;
var someArray = [ 1, 2, 3, 4, 5 ];
myFunc(1, 2, "do it", home);
$("#myID").attr("value", "123");
}
for (var i in someArray) {
console.log("Hi there " + i);
}
function ( arg1, arg2 ) {
alert("Anonymous function " + arg1 + arg2)
}(1, 2);
}


... ok I just droped nonsense code in there for exemplification. A few
words:

1. JsIf, JsForEach describe JavaScript if and for(each) statements
2. Functions like __<, __>, ... __+, __- are function that alows definition
of boolean and/or algebraic expressions.
3. Wrap just wraps an expression into ()
4. Var defined a variable
5 := defines an assignment
6. JsFunc declares a JS function
7. JsAnonFunc declares an anonymous function
8. 'myFunc(1, 2, "do it", 'home)  is simply a javascript function invocation
by providing 4 parameter.
9. ~ is just a function that chains statements that don;t necessarily end in
;


Do you think that something like this would be usable in Lift?

Br's,
Marius

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Re: [Lift] Highlighting even/odd rows in a table

[Ross Mellgren]

Oh, speaking of jquery, tablesorter also has a "zebra" plugin that does this, 
so if you're tablesorter you can use that also.

-Ross

On Dec 16, 2009, at 9:01 PM, Alex Boisvert wrote:

> Or delegate the work to the browser using jQuery + CSS
> http://docs.jquery.com/Selectors/odd
> 
> alex
> 
> 
> On Wed, Dec 16, 2009 at 4:04 PM, Ross Mellgren  wrote:
> You could use customers.zipWithIndex.flatMap({ case (customer, index)
> => ... instead of customers.flatMap(customer => to get the index, and
> then use index % 2 == 0 to see if it's an even row or an odd row. How
> you get that style into your template is up to you -- using an
> attribute bind param would probably be pretty easy, or emitting the
>  straight out of the snippet.
> 
> If you need more guidance give a shout and I'll write you up some
> example code.
> 
> Note that zipWithIndex only works on List, and it regenerates the
> list, so if you have a bunch of customers on the page and are
> concerned about performance you might want to do something different
> (and less convenient).
> 
> -Ross
> 
> On Dec 16, 2009, at 5:59 PM, Stevo wrote:
> 
> > Say for a second that in one of my Snippets I have the following
> > binding:
> >
> >   def view(xhtml: NodeSeq): NodeSeq =
> >   {
> >   val entries: NodeSeq = Customer.findAll() match
> >   {
> >   case Nil => Text("No customers currently defined")
> >   case customers =>
> >   customers.flatMap(customer => bind("cust", 
> > chooseTemplate
> > ("customer", "entry", xhtml),
> >   "name" -> 
> > Text(emptyIfNull(customer.name.is)),
> >   "address" -> Text
> > (customer.workAddress.obj.open_!.singleTextLine),
> >   "phone" -> 
> > Text(emptyIfNull(customer.workPhone.is)),
> >   "other" -> 
> > Text(emptyIfNull(customer.other.is)),
> >   "fax" -> 
> > Text(emptyIfNull(customer.workFax.is)),
> >   "email" -> 
> > Text(emptyIfNull(customer.email.is)),
> >   "url" -> 
> > Text(emptyIfNull(customer.email.is
> >   }
> >   bind("customer", xhtml, "entry" -> entries)
> >   }
> >
> > Is there a way that I could apply a style to a complete customer:entry
> > with the goal of highlighting even/odd rows?
> >
> > Let me know and best regards to all,
> >
> >
> > Steve
> >
> > --
> >
> > --
> >
> > You received this message because you are subscribed to the Google
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> >
> >
> 
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Re: [Lift] Highlighting even/odd rows in a table

[Alex Boisvert]

Or delegate the work to the browser using jQuery + CSS
http://docs.jquery.com/Selectors/odd

alex


On Wed, Dec 16, 2009 at 4:04 PM, Ross Mellgren  wrote:

> You could use customers.zipWithIndex.flatMap({ case (customer, index)
> => ... instead of customers.flatMap(customer => to get the index, and
> then use index % 2 == 0 to see if it's an even row or an odd row. How
> you get that style into your template is up to you -- using an
> attribute bind param would probably be pretty easy, or emitting the
>  straight out of the snippet.
>
> If you need more guidance give a shout and I'll write you up some
> example code.
>
> Note that zipWithIndex only works on List, and it regenerates the
> list, so if you have a bunch of customers on the page and are
> concerned about performance you might want to do something different
> (and less convenient).
>
> -Ross
>
> On Dec 16, 2009, at 5:59 PM, Stevo wrote:
>
> > Say for a second that in one of my Snippets I have the following
> > binding:
> >
> >   def view(xhtml: NodeSeq): NodeSeq =
> >   {
> >   val entries: NodeSeq = Customer.findAll() match
> >   {
> >   case Nil => Text("No customers currently defined")
> >   case customers =>
> >   customers.flatMap(customer => bind("cust",
> chooseTemplate
> > ("customer", "entry", xhtml),
> >   "name" -> Text(emptyIfNull(
> customer.name.is)),
> >   "address" -> Text
> > (customer.workAddress.obj.open_!.singleTextLine),
> >   "phone" -> Text(emptyIfNull(
> customer.workPhone.is)),
> >   "other" -> Text(emptyIfNull(
> customer.other.is)),
> >   "fax" -> Text(emptyIfNull(
> customer.workFax.is)),
> >   "email" -> Text(emptyIfNull(
> customer.email.is)),
> >   "url" -> Text(emptyIfNull(
> customer.email.is
> >   }
> >   bind("customer", xhtml, "entry" -> entries)
> >   }
> >
> > Is there a way that I could apply a style to a complete customer:entry
> > with the goal of highlighting even/odd rows?
> >
> > Let me know and best regards to all,
> >
> >
> > Steve
> >
> > --
> >
> > --
> >
> > You received this message because you are subscribed to the Google
> > Groups "Lift" group.
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> > .
> >
> >
>
> --
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>
>

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Re: [Lift] Highlighting even/odd rows in a table

[Ross Mellgren]

You could use customers.zipWithIndex.flatMap({ case (customer, index)  
=> ... instead of customers.flatMap(customer => to get the index, and  
then use index % 2 == 0 to see if it's an even row or an odd row. How  
you get that style into your template is up to you -- using an  
attribute bind param would probably be pretty easy, or emitting the  
 straight out of the snippet.

If you need more guidance give a shout and I'll write you up some  
example code.

Note that zipWithIndex only works on List, and it regenerates the  
list, so if you have a bunch of customers on the page and are  
concerned about performance you might want to do something different  
(and less convenient).

-Ross

On Dec 16, 2009, at 5:59 PM, Stevo wrote:

> Say for a second that in one of my Snippets I have the following
> binding:
>
>   def view(xhtml: NodeSeq): NodeSeq =
>   {
>   val entries: NodeSeq = Customer.findAll() match
>   {
>   case Nil => Text("No customers currently defined")
>   case customers =>
>   customers.flatMap(customer => bind("cust", 
> chooseTemplate
> ("customer", "entry", xhtml),
>   "name" -> 
> Text(emptyIfNull(customer.name.is)),
>   "address" -> Text
> (customer.workAddress.obj.open_!.singleTextLine),
>   "phone" -> 
> Text(emptyIfNull(customer.workPhone.is)),
>   "other" -> 
> Text(emptyIfNull(customer.other.is)),
>   "fax" -> 
> Text(emptyIfNull(customer.workFax.is)),
>   "email" -> 
> Text(emptyIfNull(customer.email.is)),
>   "url" -> 
> Text(emptyIfNull(customer.email.is
>   }
>   bind("customer", xhtml, "entry" -> entries)
>   }
>
> Is there a way that I could apply a style to a complete customer:entry
> with the goal of highlighting even/odd rows?
>
> Let me know and best regards to all,
>
>
> Steve
>
> --
>
> --
>
> You received this message because you are subscribed to the Google  
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> .
>
>

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[Lift] Highlighting even/odd rows in a table

[Stevo]

Say for a second that in one of my Snippets I have the following
binding:

def view(xhtml: NodeSeq): NodeSeq =
{
val entries: NodeSeq = Customer.findAll() match
{
case Nil => Text("No customers currently defined")
case customers =>
customers.flatMap(customer => bind("cust", 
chooseTemplate
("customer", "entry", xhtml),
"name" -> 
Text(emptyIfNull(customer.name.is)),
"address" -> Text
(customer.workAddress.obj.open_!.singleTextLine),
"phone" -> 
Text(emptyIfNull(customer.workPhone.is)),
"other" -> 
Text(emptyIfNull(customer.other.is)),
"fax" -> 
Text(emptyIfNull(customer.workFax.is)),
"email" -> 
Text(emptyIfNull(customer.email.is)),
"url" -> 
Text(emptyIfNull(customer.email.is
}
bind("customer", xhtml, "entry" -> entries)
}

Is there a way that I could apply a style to a complete customer:entry
with the goal of highlighting even/odd rows?

Let me know and best regards to all,


Steve

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Re: [Lift] Funny behavior of head merging with nested head blocks

[Ross Mellgren]

On Dec 16, 2009, at 3:54 PM, David Pollak wrote:
> On Wed, Dec 16, 2009 at 11:55 AM, Ross Mellgren   
> wrote:
> I agree I'm doing the wrong thing here -- the  tag
> rightly should be outside of the head block, or the snippet should not
> emit . However, the resulting behavior is funny (certainly more
> funny than I'd expect):
>
>
> http://liftweb.net/"; xmlns="http://www.w3.org/1999/xhtml
> ">
> 
> ...
> Email Editor
>
>
> 
> //  var pxStandardDialogOptions = {"autoOpen": false, "bgiframe": true,
> "modal": true, "resizable": false};
> // ]]>
> 
>
>
> 
> //  var pxStandardDialogOptions = {"autoOpen": false, "bgiframe": true,
> "modal": true, "resizable": false};
> // ]]>
> 
>
>
> 
> ...
> 
>
>
> Ideally I'd like this to "just work" so that it doesn't matter
> precisely where the snippet is called, though it would be some special
> magic just to work around an erroneous case. But, the behavior that
> does happen seems odd, duplicating the markup inside the ?
>
> Should I file a bug? Just smile and nod?
>
> If we had to recursively check all the  tags for  tags,  
> that would significantly increase the overhead of the rewrite  
> phase.  I would suggest using the new Helpers.stripHead() call to  
> remove  tags from stuff you already know is in a  tag.

We're pinned to 1.1-M8 now, and I don't think it has the method, but  
in any case I'm just going to remove the  from the snippet since  
the name of the snippet method implies it should be in the head already.

I was more curious whether the duplication of nodes is something that  
should be fixed or at least investigated. Having my snippet called  
once but chunks of its output appearing in two places surprised (and  
confused) me, it was only when I was creating a reproducible test case  
that I realized my mistake was the nested blocks, since the first  
appearance of the snippet output had no  around it so it  
appeared to be the right thing.

-Ross

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[Lift] Re: lift_successRegisterGC()

[Alex Black]

Heh.  We're only using basic templates/snippets, and url rewriting/
dispatching.  We're not using lift forms, ajax, comet, mapper etc.  We
just wanted a templating engine that worked well with Scala, and Lift
seems to do that pretty nicely

I'm stubborn - I'm holding to my views that web servers should be as
stateless as possible - using state for callbacks doesn't sit well
with me, yet.

- Alex

On Dec 16, 4:35 pm, David Pollak 
wrote:
> On Wed, Dec 16, 2009 at 1:30 PM, Alex Black  wrote:
> > cool, thanks for the info. We're not using those features yet, so
> > we'll leave this off for now.
>
> If you're not "using those features" what part of Lift are you using?
>
> Can you send the raw HTML (via view source in your browser) of a page?  I'm
> betting that you're using some GUID <-> function stuff... it's pretty hard
> not to in Lift.
>
>
>
>
>
> > On Dec 16, 4:03 pm, David Pollak 
> > wrote:
> > > On Wed, Dec 16, 2009 at 5:56 AM, Alex Black  wrote:
> > > > > Are you using any Comet or Ajax or any Lift generated form elements?
> >  If
> > > > you
> > > > > are using any of these (anything where Lift is storing a function on
> > the
> > > > > server-side and presenting the function as a GUID on the client
> > side),
> > > > then
> > > > > it is strongly advised that you enable GC.
>
> > > To disable Garbage Collection:
>
> > > LiftRules.enableLiftGC = false
>
> > > Each GUID that's shipped to the client for form callbacks, Comet
> > callbacks,
> > > Ajax callbacks, JSON callbacks, etc. is associated with a function.  That
> > > function is stored in a session-specific table that maps from GUIDs to
> > > functions.  Without garbage collection, the functions associated with the
> > > GUIDs build up for the duration of a given session.  The can be memory
> > > intensive.  So, we've implemented a mechanism where every 75 seconds (a
> > > tunable parameter), the browser does an Ajax call to the server saying
> > "page
> > > " is still live.  All GUIDs associated with that page are "kept
> > > around."  If a GUID hasn't been seen on a page in 10 minutes and is not
> > > associated with a Comet component that's still live, then the function is
> > > removed from the GUID mapping table and will ultimately be removed from
> > > memory by the JVM garbage collector.
>
> > > > We're not using Comet or Lift generated form elements.  We are using a
> > > > jQuery plugin to do autocomplete which uses ajax. Can you tell me a
> > > > bit more about GC, is it a jQuery thing?
>
> > > > I've turned off auto ajax also:
>
> > > >  // For now, disable all Lift ajax stuff
> > > >    LiftRules.autoIncludeAjax = session => false
>
> > > > So, I get this error on every page:
>
> > > > Error: lift_successRegisterGC is not defined
>
> > > > and this error on pages that don't use jQuery:
>
> > > > Error: jQuery is not defined
>
> > > > > > Thanks!
>
> > > > > > - Alex
>
> > > > > > --
>
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>
> > > > 
> > 
>
> > > > > > .
> > > > > > For more options, visit this group at
> > > > > >http://groups.google.com/group/liftweb?hl=en.
>
> > > > > --
> > > > > Lift, the simply functional web frameworkhttp://liftweb.net
> > > > > Beginning Scalahttp://www.apress.com/book/view/1430219890
> > > > > Follow me:http://twitter.com/dpp
> > > > > Surf the harmonics
>
> > > > --
>
> > > > You received this message because you are subscribed to the Google
> > Groups
> > > > "Lift" group.
> > > > To post to this group, send email to lift...@googlegroups.com.
> > > > To unsubscribe from this group, send email to
> > > > liftweb+unsubscr...@googlegroups.com
> > 
>
> > > > .
> > > > For more options, visit this group at
> > > >http://groups.google.com/group/liftweb?hl=en.
>
> > > --
> > > Lift, the simply functional web frameworkhttp://liftweb.net
> > > Beginning Scalahttp://www.apress.com/book/view/1430219890
> > > Follow me:http://twitter.com/dpp
> > > Surf the harmonics
>
> > --
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>
> --
> Lift, the simply functional web frameworkhttp://liftweb.net
> Beginning Scalahttp://www.apress.com/book/view/1430219890
> Follow me:http://twitter.com/dpp
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Re: [Lift] Re: lift_successRegisterGC()

[David Pollak]

On Wed, Dec 16, 2009 at 1:30 PM, Alex Black  wrote:

> cool, thanks for the info. We're not using those features yet, so
> we'll leave this off for now.
>

If you're not "using those features" what part of Lift are you using?

Can you send the raw HTML (via view source in your browser) of a page?  I'm
betting that you're using some GUID <-> function stuff... it's pretty hard
not to in Lift.


>
> On Dec 16, 4:03 pm, David Pollak 
> wrote:
> > On Wed, Dec 16, 2009 at 5:56 AM, Alex Black  wrote:
> > > > Are you using any Comet or Ajax or any Lift generated form elements?
>  If
> > > you
> > > > are using any of these (anything where Lift is storing a function on
> the
> > > > server-side and presenting the function as a GUID on the client
> side),
> > > then
> > > > it is strongly advised that you enable GC.
> >
> > To disable Garbage Collection:
> >
> > LiftRules.enableLiftGC = false
> >
> > Each GUID that's shipped to the client for form callbacks, Comet
> callbacks,
> > Ajax callbacks, JSON callbacks, etc. is associated with a function.  That
> > function is stored in a session-specific table that maps from GUIDs to
> > functions.  Without garbage collection, the functions associated with the
> > GUIDs build up for the duration of a given session.  The can be memory
> > intensive.  So, we've implemented a mechanism where every 75 seconds (a
> > tunable parameter), the browser does an Ajax call to the server saying
> "page
> > " is still live.  All GUIDs associated with that page are "kept
> > around."  If a GUID hasn't been seen on a page in 10 minutes and is not
> > associated with a Comet component that's still live, then the function is
> > removed from the GUID mapping table and will ultimately be removed from
> > memory by the JVM garbage collector.
> >
> >
> >
> > > We're not using Comet or Lift generated form elements.  We are using a
> > > jQuery plugin to do autocomplete which uses ajax. Can you tell me a
> > > bit more about GC, is it a jQuery thing?
> >
> > > I've turned off auto ajax also:
> >
> > >  // For now, disable all Lift ajax stuff
> > >LiftRules.autoIncludeAjax = session => false
> >
> > > So, I get this error on every page:
> >
> > > Error: lift_successRegisterGC is not defined
> >
> > > and this error on pages that don't use jQuery:
> >
> > > Error: jQuery is not defined
> >
> > > > > Thanks!
> >
> > > > > - Alex
> >
> > > > > --
> >
> > > > > You received this message because you are subscribed to the Google
> > > Groups
> > > > > "Lift" group.
> > > > > To post to this group, send email to lift...@googlegroups.com.
> > > > > To unsubscribe from this group, send email to
> > > > > liftweb+unsubscr...@googlegroups.com
> 
> >
> > > 
> 
> >
> >
> > > > > .
> > > > > For more options, visit this group at
> > > > >http://groups.google.com/group/liftweb?hl=en.
> >
> > > > --
> > > > Lift, the simply functional web frameworkhttp://liftweb.net
> > > > Beginning Scalahttp://www.apress.com/book/view/1430219890
> > > > Follow me:http://twitter.com/dpp
> > > > Surf the harmonics
> >
> > > --
> >
> > > You received this message because you are subscribed to the Google
> Groups
> > > "Lift" group.
> > > To post to this group, send email to lift...@googlegroups.com.
> > > To unsubscribe from this group, send email to
> > > liftweb+unsubscr...@googlegroups.com
> 
> >
> > > .
> > > For more options, visit this group at
> > >http://groups.google.com/group/liftweb?hl=en.
> >
> > --
> > Lift, the simply functional web frameworkhttp://liftweb.net
> > Beginning Scalahttp://www.apress.com/book/view/1430219890
> > Follow me:http://twitter.com/dpp
> > Surf the harmonics
>
> --
>
> You received this message because you are subscribed to the Google Groups
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> http://groups.google.com/group/liftweb?hl=en.
>
>
>


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[Lift] Re: lift_successRegisterGC()

[Alex Black]

cool, thanks for the info. We're not using those features yet, so
we'll leave this off for now.

On Dec 16, 4:03 pm, David Pollak 
wrote:
> On Wed, Dec 16, 2009 at 5:56 AM, Alex Black  wrote:
> > > Are you using any Comet or Ajax or any Lift generated form elements?  If
> > you
> > > are using any of these (anything where Lift is storing a function on the
> > > server-side and presenting the function as a GUID on the client side),
> > then
> > > it is strongly advised that you enable GC.
>
> To disable Garbage Collection:
>
> LiftRules.enableLiftGC = false
>
> Each GUID that's shipped to the client for form callbacks, Comet callbacks,
> Ajax callbacks, JSON callbacks, etc. is associated with a function.  That
> function is stored in a session-specific table that maps from GUIDs to
> functions.  Without garbage collection, the functions associated with the
> GUIDs build up for the duration of a given session.  The can be memory
> intensive.  So, we've implemented a mechanism where every 75 seconds (a
> tunable parameter), the browser does an Ajax call to the server saying "page
> " is still live.  All GUIDs associated with that page are "kept
> around."  If a GUID hasn't been seen on a page in 10 minutes and is not
> associated with a Comet component that's still live, then the function is
> removed from the GUID mapping table and will ultimately be removed from
> memory by the JVM garbage collector.
>
>
>
> > We're not using Comet or Lift generated form elements.  We are using a
> > jQuery plugin to do autocomplete which uses ajax. Can you tell me a
> > bit more about GC, is it a jQuery thing?
>
> > I've turned off auto ajax also:
>
> >  // For now, disable all Lift ajax stuff
> >    LiftRules.autoIncludeAjax = session => false
>
> > So, I get this error on every page:
>
> > Error: lift_successRegisterGC is not defined
>
> > and this error on pages that don't use jQuery:
>
> > Error: jQuery is not defined
>
> > > > Thanks!
>
> > > > - Alex
>
> > > > --
>
> > > > You received this message because you are subscribed to the Google
> > Groups
> > > > "Lift" group.
> > > > To post to this group, send email to lift...@googlegroups.com.
> > > > To unsubscribe from this group, send email to
> > > > liftweb+unsubscr...@googlegroups.com
> > 
>
> > > > .
> > > > For more options, visit this group at
> > > >http://groups.google.com/group/liftweb?hl=en.
>
> > > --
> > > Lift, the simply functional web frameworkhttp://liftweb.net
> > > Beginning Scalahttp://www.apress.com/book/view/1430219890
> > > Follow me:http://twitter.com/dpp
> > > Surf the harmonics
>
> > --
>
> > You received this message because you are subscribed to the Google Groups
> > "Lift" group.
> > To post to this group, send email to lift...@googlegroups.com.
> > To unsubscribe from this group, send email to
> > liftweb+unsubscr...@googlegroups.com
> > .
> > For more options, visit this group at
> >http://groups.google.com/group/liftweb?hl=en.
>
> --
> Lift, the simply functional web frameworkhttp://liftweb.net
> Beginning Scalahttp://www.apress.com/book/view/1430219890
> Follow me:http://twitter.com/dpp
> Surf the harmonics

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Re: [Lift] Re: lift_successRegisterGC()

[David Pollak]

On Wed, Dec 16, 2009 at 5:56 AM, Alex Black  wrote:

> > Are you using any Comet or Ajax or any Lift generated form elements?  If
> you
> > are using any of these (anything where Lift is storing a function on the
> > server-side and presenting the function as a GUID on the client side),
> then
> > it is strongly advised that you enable GC.
>
>
To disable Garbage Collection:

LiftRules.enableLiftGC = false

Each GUID that's shipped to the client for form callbacks, Comet callbacks,
Ajax callbacks, JSON callbacks, etc. is associated with a function.  That
function is stored in a session-specific table that maps from GUIDs to
functions.  Without garbage collection, the functions associated with the
GUIDs build up for the duration of a given session.  The can be memory
intensive.  So, we've implemented a mechanism where every 75 seconds (a
tunable parameter), the browser does an Ajax call to the server saying "page
" is still live.  All GUIDs associated with that page are "kept
around."  If a GUID hasn't been seen on a page in 10 minutes and is not
associated with a Comet component that's still live, then the function is
removed from the GUID mapping table and will ultimately be removed from
memory by the JVM garbage collector.




> We're not using Comet or Lift generated form elements.  We are using a
> jQuery plugin to do autocomplete which uses ajax. Can you tell me a
> bit more about GC, is it a jQuery thing?
>
> I've turned off auto ajax also:
>
>  // For now, disable all Lift ajax stuff
>LiftRules.autoIncludeAjax = session => false
>
> So, I get this error on every page:
>
> Error: lift_successRegisterGC is not defined
>
> and this error on pages that don't use jQuery:
>
> Error: jQuery is not defined
>
>
>
>
> >
> >
> >
> >
> >
> > > Thanks!
> >
> > > - Alex
> >
> > > --
> >
> > > You received this message because you are subscribed to the Google
> Groups
> > > "Lift" group.
> > > To post to this group, send email to lift...@googlegroups.com.
> > > To unsubscribe from this group, send email to
> > > liftweb+unsubscr...@googlegroups.com
> 
> >
> > > .
> > > For more options, visit this group at
> > >http://groups.google.com/group/liftweb?hl=en.
> >
> > --
> > Lift, the simply functional web frameworkhttp://liftweb.net
> > Beginning Scalahttp://www.apress.com/book/view/1430219890
> > Follow me:http://twitter.com/dpp
> > Surf the harmonics
>
> --
>
> You received this message because you are subscribed to the Google Groups
> "Lift" group.
> To post to this group, send email to lift...@googlegroups.com.
> To unsubscribe from this group, send email to
> liftweb+unsubscr...@googlegroups.com
> .
> For more options, visit this group at
> http://groups.google.com/group/liftweb?hl=en.
>
>
>


-- 
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Beginning Scala http://www.apress.com/book/view/1430219890
Follow me: http://twitter.com/dpp
Surf the harmonics

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Re: [Lift] Re: Duplicate Keys Created by Schemefier

[David Pollak]

On Wed, Dec 16, 2009 at 11:07 AM, Peter Robinett wrote:

> Fair enough, but isn't this still a non-optimal situation with the
> MySQL database driver?
>

What is your proposed change?


>
> Peter
>
> On Dec 15, 7:23 pm, David Pollak 
> wrote:
> > On Tue, Dec 15, 2009 at 5:46 PM, Peter Robinett  >wrote:
> >
> >
> >
> >
> >
> > > My tables created by Schemefier have multiple keys for the primary key
> > > when my Mapper model is declared like so: class myModel extends
> > > LongKeyedMapper[myModel] with IdPK. There is naturally the primary key
> > > but there is also a unique key on the column that simply duplicates
> > > the functionality of the primary key.
> >
> > > Are other people seeing this? I've only looked on MySQL. This seems to
> > > be because IdPK adds an id of type MappedLongIndex. Only the
> > > longIndexColumnType of MySqlDriver has "UNIQUE KEY" in its definition.
> > > Unique keys are great but, as I mentioned, if the column is also the
> > > primary key the index is a duplication. Maybe this is something that
> > > IdPK can disable when declaring the column? At least with MySQL
> > > primary keys are guaranteed to be unique and InnoDB tables, which
> > > Mapper uses, can have issues with long primary keys[1].
> >
> > > Should this be fixed? Or is the more helpful answer 'Don't use
> > > MySQL'? ;-)
> >
> > I would use MySQL for a production site.
> >
> > If IdPK isn't doing what you want, then don't use it, just declare the
> > primary key field manually.
> >
> >
> >
> >
> >
> >
> >
> > > Peter
> >
> > > [1]:http://dev.mysql.com/doc/refman/5.1/en/innodb-index-types.html
> >
> > > --
> >
> > > You received this message because you are subscribed to the Google
> Groups
> > > "Lift" group.
> > > To post to this group, send email to lift...@googlegroups.com.
> > > To unsubscribe from this group, send email to
> > > liftweb+unsubscr...@googlegroups.com
> >
> > > .
> > > For more options, visit this group at
> > >http://groups.google.com/group/liftweb?hl=en.
> >
> > --
> > Lift, the simply functional web frameworkhttp://liftweb.net
> > Beginning Scalahttp://www.apress.com/book/view/1430219890
> > Follow me:http://twitter.com/dpp
> > Surf the harmonics
>
> --
>
> You received this message because you are subscribed to the Google Groups
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>
>
>


-- 
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Beginning Scala http://www.apress.com/book/view/1430219890
Follow me: http://twitter.com/dpp
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Re: [Lift] Funny behavior of head merging with nested head blocks

[David Pollak]

On Wed, Dec 16, 2009 at 11:55 AM, Ross Mellgren  wrote:

> I was diagnosing some incorrect HTML in our application using Lift,
> and I found a strange behavior of head merging (I assume) when you
> emit a  tag into a  tag from the snippet. The code speaks
> better than I do about this:
>
> ...
> object Dialog extends DispatchSnippet {
> val standardDialogOptions: JsObj = JsObj(
> "autoOpen"  -> false,
> "bgiframe"  -> true,
> "modal" -> true,
> "resizable" -> false
> )
>
> val dispatch: DispatchIt = {
> case "head" => renderHead
> case "render" => render
> }
>
> def renderHead(ns: NodeSeq): NodeSeq =
> { Script { JsCrVar("pxStandardDialogOptions",
> Dialog.standardDialogOptions) } }
> ...
> }
>
>
> LiftRules.snippetDispatch.append {
> ...
> case "Dialog"   => Dialog
> ...
> }
>
>
> 
> 
> Email Editor
> 
> 
> 
>
>
> I agree I'm doing the wrong thing here -- the  tag
> rightly should be outside of the head block, or the snippet should not
> emit . However, the resulting behavior is funny (certainly more
> funny than I'd expect):
>
>
> http://liftweb.net/"; xmlns="http://www.w3.org/1999/xhtml
> ">
> 
> ...
> Email Editor
>
>
> 
> //  var pxStandardDialogOptions = {"autoOpen": false, "bgiframe": true,
> "modal": true, "resizable": false};
> // ]]>
> 
>
>
> 
> //  var pxStandardDialogOptions = {"autoOpen": false, "bgiframe": true,
> "modal": true, "resizable": false};
> // ]]>
> 
>
>
> 
> ...
> 
>
>
> Ideally I'd like this to "just work" so that it doesn't matter
> precisely where the snippet is called, though it would be some special
> magic just to work around an erroneous case. But, the behavior that
> does happen seems odd, duplicating the markup inside the ?
>
> Should I file a bug? Just smile and nod?
>

If we had to recursively check all the  tags for  tags, that
would significantly increase the overhead of the rewrite phase.  I would
suggest using the new Helpers.stripHead() call to remove  tags from
stuff you already know is in a  tag.


>
> -Ross
>
>
>
>
> --
>
> You received this message because you are subscribed to the Google Groups
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>
>
>


-- 
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Follow me: http://twitter.com/dpp
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[Lift] Funny behavior of head merging with nested head blocks

[Ross Mellgren]

I was diagnosing some incorrect HTML in our application using Lift,  
and I found a strange behavior of head merging (I assume) when you  
emit a  tag into a  tag from the snippet. The code speaks  
better than I do about this:

...
object Dialog extends DispatchSnippet {
 val standardDialogOptions: JsObj = JsObj(
 "autoOpen"  -> false,
 "bgiframe"  -> true,
 "modal" -> true,
 "resizable" -> false
 )

 val dispatch: DispatchIt = {
 case "head" => renderHead
 case "render" => render
 }

 def renderHead(ns: NodeSeq): NodeSeq =
 { Script { JsCrVar("pxStandardDialogOptions",  
Dialog.standardDialogOptions) } }
...
}


 LiftRules.snippetDispatch.append {
...
 case "Dialog"   => Dialog
...
 }



 
 Email Editor
 
 



I agree I'm doing the wrong thing here -- the  tag  
rightly should be outside of the head block, or the snippet should not  
emit . However, the resulting behavior is funny (certainly more  
funny than I'd expect):


http://liftweb.net/"; xmlns="http://www.w3.org/1999/xhtml 
">

...
Email Editor



// 




// 




...



Ideally I'd like this to "just work" so that it doesn't matter  
precisely where the snippet is called, though it would be some special  
magic just to work around an erroneous case. But, the behavior that  
does happen seems odd, duplicating the markup inside the ?

Should I file a bug? Just smile and nod?

-Ross




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[Lift] Re: Duplicate Keys Created by Schemefier

[Peter Robinett]

Fair enough, but isn't this still a non-optimal situation with the
MySQL database driver?

Peter

On Dec 15, 7:23 pm, David Pollak 
wrote:
> On Tue, Dec 15, 2009 at 5:46 PM, Peter Robinett 
> wrote:
>
>
>
>
>
> > My tables created by Schemefier have multiple keys for the primary key
> > when my Mapper model is declared like so: class myModel extends
> > LongKeyedMapper[myModel] with IdPK. There is naturally the primary key
> > but there is also a unique key on the column that simply duplicates
> > the functionality of the primary key.
>
> > Are other people seeing this? I've only looked on MySQL. This seems to
> > be because IdPK adds an id of type MappedLongIndex. Only the
> > longIndexColumnType of MySqlDriver has "UNIQUE KEY" in its definition.
> > Unique keys are great but, as I mentioned, if the column is also the
> > primary key the index is a duplication. Maybe this is something that
> > IdPK can disable when declaring the column? At least with MySQL
> > primary keys are guaranteed to be unique and InnoDB tables, which
> > Mapper uses, can have issues with long primary keys[1].
>
> > Should this be fixed? Or is the more helpful answer 'Don't use
> > MySQL'? ;-)
>
> I would use MySQL for a production site.
>
> If IdPK isn't doing what you want, then don't use it, just declare the
> primary key field manually.
>
>
>
>
>
>
>
> > Peter
>
> > [1]:http://dev.mysql.com/doc/refman/5.1/en/innodb-index-types.html
>
> > --
>
> > You received this message because you are subscribed to the Google Groups
> > "Lift" group.
> > To post to this group, send email to lift...@googlegroups.com.
> > To unsubscribe from this group, send email to
> > liftweb+unsubscr...@googlegroups.com > >
> > .
> > For more options, visit this group at
> >http://groups.google.com/group/liftweb?hl=en.
>
> --
> Lift, the simply functional web frameworkhttp://liftweb.net
> Beginning Scalahttp://www.apress.com/book/view/1430219890
> Follow me:http://twitter.com/dpp
> Surf the harmonics

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[Lift] Re: lift_successRegisterGC()

[Alex Black]

I found this in another thread:

LiftRules.enableLiftGC = false


On Dec 16, 12:55 pm, Alex Black  wrote:
> Hi David, is there a way to turn off the output of this javascript
> code?
>
> On Dec 16, 8:51 am, David Pollak 
> wrote:
>
> > On Wed, Dec 16, 2009 at 5:47 AM, Alex Black  wrote:
> > > I see the following javascript on each of my pages in my site:
>
> > > // 
>
> > > I don't think its necessary for what I'm doing, is there a way to turn
> > > off this feature?
>
> > Are you using any Comet or Ajax or any Lift generated form elements?  If you
> > are using any of these (anything where Lift is storing a function on the
> > server-side and presenting the function as a GUID on the client side), then
> > it is strongly advised that you enable GC.
>
> > > Thanks!
>
> > > - Alex
>
> > > --
>
> > > You received this message because you are subscribed to the Google Groups
> > > "Lift" group.
> > > To post to this group, send email to lift...@googlegroups.com.
> > > To unsubscribe from this group, send email to
> > > liftweb+unsubscr...@googlegroups.com
> > > .
> > > For more options, visit this group at
> > >http://groups.google.com/group/liftweb?hl=en.
>
> > --
> > Lift, the simply functional web frameworkhttp://liftweb.net
> > Beginning Scalahttp://www.apress.com/book/view/1430219890
> > Follow me:http://twitter.com/dpp
> > Surf the harmonics

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[Lift] Re: Please review a simple app for displaying Flickr pictures

[Alex Black]

Hey Dave, great site, beautiful photography.

If you had time you might add some URL rewriting, so that galleries
had nice urls like:

http://briccettiphoto.com/show/galleries/kenya

- Alex

On Dec 13, 1:44 am, Dave Briccetti  wrote:
> For a lightning talk at Bay Area Scala Enthusiasts at Twitter HQ
> Monday, I will show BirdShow, a Lift application that shows photos
> from Flickr. The current instantiation is a nature photography Web
> site. Would some of you Lift experts be willing to review the code and
> comment on the application? I want this to be an example of good Scala
> and Lift coding. I will gladly acknowledge your help in the
> presentation.
>
> http://briccettiphoto.comhttp://github.com/dcbriccetti/bird-show

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[Lift] Re: lift_successRegisterGC()

[Alex Black]

Hi David, is there a way to turn off the output of this javascript
code?

On Dec 16, 8:51 am, David Pollak 
wrote:
> On Wed, Dec 16, 2009 at 5:47 AM, Alex Black  wrote:
> > I see the following javascript on each of my pages in my site:
>
> > // 
>
> > I don't think its necessary for what I'm doing, is there a way to turn
> > off this feature?
>
> Are you using any Comet or Ajax or any Lift generated form elements?  If you
> are using any of these (anything where Lift is storing a function on the
> server-side and presenting the function as a GUID on the client side), then
> it is strongly advised that you enable GC.
>
>
>
>
>
> > Thanks!
>
> > - Alex
>
> > --
>
> > You received this message because you are subscribed to the Google Groups
> > "Lift" group.
> > To post to this group, send email to lift...@googlegroups.com.
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>
> --
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> Beginning Scalahttp://www.apress.com/book/view/1430219890
> Follow me:http://twitter.com/dpp
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[Lift] Confused about validation

[greekscala]

Hello lift people,

lift seems very promising. I am trying to make some tests
and examples because I am new to lift.
I wanted to add some validation to a form element and show
the validation error to the user.
But after little searching I was a little disappointet to see that
there
is no such support, exept when using Mapper. I do not want to use
Mapper.  I want only simple field validation with the errors messages
printed in a feedback panel.

Before lift I was using Wicket. I think they did a good job with the
validators.

I try to understand why lift has not such support? I do not want to
code
everything in my submit method and validate things there.

best regards

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Re: [Lift] Re: Please review a simple app for displaying Flickr pictures

[Indrajit Raychaudhuri]

Wonderful, and thanks for the credits!

Cheers, Indrajit

On 15/12/09 11:49 PM, Timothy Perrett wrote:
> Awesome Dave! Thanks for the acknowledgement.
>
> Cheers, Tim
>
> On 15 Dec 2009, at 18:07, Dave Briccetti wrote:
>
>> Thanks again for the help. Here are tho talk slides:
>> http://www.slideshare.net/dcbriccetti/birdshow-a-lift-app-for-showing-flickr-photos-2720594
>>
>> --
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>>
>>
>
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Re: [Lift] Re: How to disable XHTML?

[Indrajit Raychaudhuri]

On 15/12/09 6:31 PM, Tim Nelson wrote:
> You need to remove the if guard on the first case match and change the
> second parameter you are passing to Req. The second param is for the
> context. Try this:
>
> LiftRules.determineContentType = {
>case (Full(Req("location" :: "maps" :: "testmap" :: Nil, _,
> GetRequest)), Full(accept)) =>  "text/html; charset=utf-8"
>case _ =>  "application/xhtml+xml; charset=utf-8"
> }

However, in this case LiftRules.determineContentType is ignored 
completely. You could consider adjusting it like so:

LiftRules.determineContentType = {
   case (Full(Req("location" :: "maps" :: "testmap" :: Nil, _, 
GetRequest)), _) =>
   "text/html; charset=utf-8"

   case (_, Full(accept))
 if LiftRules.useXhtmlMimeType && 
accept.toLowerCase.contains("application/xhtml+xml") =>
   "application/xhtml+xml; charset=utf-8"

   case _ => "text/html; charset=utf-8"
}

Cheers, Indrajit

>
> Tim
>
> On Tue, Dec 15, 2009 at 6:09 AM, Tweek  wrote:
>> It still dosn't work :(
>>
>> this is path to my html file, which is using google maps api: ./
>> location/maps/testmap.html
>>
>> i put in my Boot.scala file this code:
>>
>> LiftRules.determineContentType = {
>> case (Full(Req("location" :: "maps" :: "testmap" :: Nil,
>> "html", GetRequest)), Full(accept))
>> if LiftRules.useXhtmlMimeType&&
>> accept.toLowerCase.contains("application/xhtml+xml") =>
>> "text/html; charset=utf-8"
>> case _ =>  "application/xhtml+xml; charset=utf-8"
>> }
>>
>> i can't disable XHTML in whole projcet becouse then i'm losing
>> functionality like jquery datepicker etc.
>>
>> Could You tell me what i did wrong?
>>
>> Thanks
>>
>> On 15 Gru, 10:38, Timothy Perrett  wrote:
>>> You need to put it in your Boot.scala file.
>>>
>>> determineContentType is of PartialFunction[(Box[Req], Box[String]), String] 
>>> type - this means that you can match on particular paths:
>>>
>>>  LiftRules.determineContentType = {
>>>case (Full(Req("some" :: "path" :: Nil, "pdf", GetRequest)), 
>>> Full(accept))
>>>  if LiftRules.useXhtmlMimeType&&  
>>> accept.toLowerCase.contains("application/xhtml+xml") =>
>>>  "application/xhtml+xml; charset=utf-8"
>>>case _ =>  "text/html; charset=utf-8"
>>>  }
>>>
>>> Cheers, Tim
>>>
>>> On 15 Dec 2009, at 07:58, Tweek wrote:
>>>
 Thanks for answer Tim.
>>>
 I know it will be a nooby question, but how i need to define this
 site, where i don't want XHTML ?
>>>
 On 14 Gru, 12:30, Tim Nelson  wrote:
> You can use LiftRules.determineContentType to do this. Here is a
> sample from my project:
>>>
> LiftRules.determineContentType = {
>case (_, Full(accept)) if LiftRules.useXhtmlMimeType&&
> accept.toLowerCase.contains("application/xhtml+xml") =>
>  "application/xhtml+xml; charset=utf-8"
>case _ =>  "text/html; charset=utf-8"
>>>
> }
>>>
> Tim
>>>
> On Mon, Dec 14, 2009 at 3:59 AM, Tweek  wrote:
>> Hi Guys
>>>
>> Is it possible todisableXHTMLonly in one html file?
>>>
>> When i put
>> "LiftRules.useXhtmlMimeType = false"
>>   in Boot.scala then i'll swich this off in whole project.
>>>
>> Is any other place to put this line?
>>>
>> Thanks.
>>>
>> --
>>>
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>>>
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[Lift] Re: lift_successRegisterGC()

[Alex Black]

> Are you using any Comet or Ajax or any Lift generated form elements?  If you
> are using any of these (anything where Lift is storing a function on the
> server-side and presenting the function as a GUID on the client side), then
> it is strongly advised that you enable GC.

We're not using Comet or Lift generated form elements.  We are using a
jQuery plugin to do autocomplete which uses ajax. Can you tell me a
bit more about GC, is it a jQuery thing?

I've turned off auto ajax also:

 // For now, disable all Lift ajax stuff
LiftRules.autoIncludeAjax = session => false

So, I get this error on every page:

Error: lift_successRegisterGC is not defined

and this error on pages that don't use jQuery:

Error: jQuery is not defined




>
>
>
>
>
> > Thanks!
>
> > - Alex
>
> > --
>
> > You received this message because you are subscribed to the Google Groups
> > "Lift" group.
> > To post to this group, send email to lift...@googlegroups.com.
> > To unsubscribe from this group, send email to
> > liftweb+unsubscr...@googlegroups.com
> > .
> > For more options, visit this group at
> >http://groups.google.com/group/liftweb?hl=en.
>
> --
> Lift, the simply functional web frameworkhttp://liftweb.net
> Beginning Scalahttp://www.apress.com/book/view/1430219890
> Follow me:http://twitter.com/dpp
> Surf the harmonics

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Re: [Lift] lift_successRegisterGC()

[David Pollak]

On Wed, Dec 16, 2009 at 5:47 AM, Alex Black  wrote:

> I see the following javascript on each of my pages in my site:
>
> // 
>
> I don't think its necessary for what I'm doing, is there a way to turn
> off this feature?
>

Are you using any Comet or Ajax or any Lift generated form elements?  If you
are using any of these (anything where Lift is storing a function on the
server-side and presenting the function as a GUID on the client side), then
it is strongly advised that you enable GC.


>
> Thanks!
>
> - Alex
>
> --
>
> You received this message because you are subscribed to the Google Groups
> "Lift" group.
> To post to this group, send email to lift...@googlegroups.com.
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> .
> For more options, visit this group at
> http://groups.google.com/group/liftweb?hl=en.
>
>
>


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Beginning Scala http://www.apress.com/book/view/1430219890
Follow me: http://twitter.com/dpp
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[Lift] lift_successRegisterGC()

[Alex Black]

I see the following javascript on each of my pages in my site:

// 

I don't think its necessary for what I'm doing, is there a way to turn
off this feature?

Thanks!

- Alex

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Re: [Lift] [ANN] Lift 1.1-M8

[Xuefeng Wu]

anyone will add the source.jar?

On Wed, Dec 16, 2009 at 3:33 AM, Jim McBeath  wrote:

> It looks like the source jars are missing from the M8 repository, at
> least for some of the libraries (for example,
> ).
>
> Are these perhaps located somewhere else now?  Or do they typically
> get added a bit later?
>
> --
> Jim
>
> On Mon, Dec 14, 2009 at 11:37:02AM -0800, David Pollak wrote:
> > Date: Mon, 14 Dec 2009 11:37:02 -0800
> > From: David Pollak 
> > To: liftweb 
> > Subject: [Lift] [ANN] Lift 1.1-M8
> >
> >The Lift Web Framework team is pleased to announce the lift-1.1-M8
> release!
>
> --
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Re: [Lift] Re: Mapper <-> JObject bridge

[Xuefeng Wu]

Thanks, Joni.

On Wed, Dec 16, 2009 at 4:24 PM, Joni Freeman wrote:

> Hi,
>
> Yes, that's a way to convert JSON AST to string and vice versa. All
> functions in lift-json operate on AST instances. This is lets us post-
> and pre-process JSON in many ways before converting it to string. See
> for instance functions map, merge, diff, \, etc. defined in JsonAST
> (scaladocs still missing but will be provided before Lift 2.0 is
> released). Typical conversions might for instance remove some data
> from JSON, convert data types, change structure of resulting JSON and
> so on.
>
> I usually import all needed objects and their members. After that the
> code becomes a bit more concise (the cast is unfortunately needed
> since JSON comes from the wild and can be anything):
>
> def encodeAsJsonString(in: A) = compact(render(encodeAsJson(in)))
> def buildFromJsonString(json: String): A = buildFromJson(parse
> (json).asInstanceOf[JObject])
>
> Cheers Joni
>
>
> On 16 joulu, 09:03, Xuefeng Wu  wrote:
> > Hi,
> > I add two method to en/decode JObject/String
> >
> > def encodeAsJsonString(in: A): String =
> > Printer.compact(JsonAST.render(encodeAsJson(in)))
> > def buildFromJsonString(json: String): A =
> > buildFromJson(JsonParser.parse(json).asInstanceOf[JsonAST.JObject])
> >
> > Do there have better way?
> >
> > On Thu, Dec 3, 2009 at 5:15 AM, David Pollak
> > wrote:
> >
> >
> >
> > > Folks (HarryH -- this means you),
> >
> > > I've just checked in code on the dpp_issue_213 that does Mapper <->
> JObject
> > > bridging using the awesome lift-json library.
> >
> > > The methods on MetaMapper:
> > > protected def encodeAsJSON_! (toEncode: A): JsonAST.JObject
> > > protected def decodeFromJSON_!(json: JsonAST.JObject): A
> >
> > > Implement the bridge.  They are protected and have a _! in their name
> > > because they are *dangerous* in that data can be exposed on the JSON
> object
> > > that you might not want exposed and these methods should be used with
> > > extreme caution.
> >
> > > An example of usage can be found in the MapperSpecs:
> >
> > > object SampleModel extends SampleModel with KeyedMetaMapper[Long,
> > > SampleModel] {
> > >   def encodeAsJson(in: SampleModel): JsonAST.JObject =
> encodeAsJSON_!(in)
> > >   def buildFromJson(json: JsonAST.JObject): SampleModel =
> > > decodeFromJSON_!(json)
> > > }
> >
> > > class SampleModel extends KeyedMapper[Long, SampleModel] {
> > >   def getSingleton = SampleModel // what's the "meta" server
> > >   def primaryKeyField = id
> >
> > >   object id extends MappedLongIndex(this)
> > >   object firstName extends MappedString(this, 32)
> > >   object moose extends MappedNullableLong(this)
> > >   object notNull extends MappedString(this, 32) {
> > > override def dbNotNull_? = true
> > >   }
> >
> > >   def encodeAsJson(): JsonAST.JObject = SampleModel.encodeAsJson(this)
> > > }
> >
> > > So, you can use this mechanism to serialize a Mapper object to JSON,
> shovel
> > > the object into memcached and then pull it out, mutate a field and save
> the
> > > object back to the database (although connection identifier is lost, so
> if
> > > you are sharding your database, this will not work).
> >
> > > Please give it a try, give me feedback.  I'll put it on review board
> > > tomorrow after any feedback and get it into Lift.
> >
> > > Thanks,
> >
> > > David
> >
> > > --
> > > Lift, the simply functional web frameworkhttp://liftweb.net
> > > Beginning Scalahttp://www.apress.com/book/view/1430219890
> > > Follow me:http://twitter.com/dpp
> > > Surf the harmonics
> >
> > > --
> > > You received this message because you are subscribed to the Google
> Groups
> > > "Lift" group.
> > > To post to this group, send email to lift...@googlegroups.com.
> > > To unsubscribe from this group, send email to
> > > liftweb+unsubscr...@googlegroups.com
> 
> >
> > > .
> > > For more options, visit this group at
> > >http://groups.google.com/group/liftweb?hl=en.
> >
> > --
> > Scala中文社区:  http://groups.google.com/group/scalacn
>
> --
>
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[Lift] Re: Mapper <-> JObject bridge

[Joni Freeman]

Hi,

Yes, that's a way to convert JSON AST to string and vice versa. All
functions in lift-json operate on AST instances. This is lets us post-
and pre-process JSON in many ways before converting it to string. See
for instance functions map, merge, diff, \, etc. defined in JsonAST
(scaladocs still missing but will be provided before Lift 2.0 is
released). Typical conversions might for instance remove some data
from JSON, convert data types, change structure of resulting JSON and
so on.

I usually import all needed objects and their members. After that the
code becomes a bit more concise (the cast is unfortunately needed
since JSON comes from the wild and can be anything):

def encodeAsJsonString(in: A) = compact(render(encodeAsJson(in)))
def buildFromJsonString(json: String): A = buildFromJson(parse
(json).asInstanceOf[JObject])

Cheers Joni


On 16 joulu, 09:03, Xuefeng Wu  wrote:
> Hi,
> I add two method to en/decode JObject/String
>
> def encodeAsJsonString(in: A): String =
> Printer.compact(JsonAST.render(encodeAsJson(in)))
> def buildFromJsonString(json: String): A =
> buildFromJson(JsonParser.parse(json).asInstanceOf[JsonAST.JObject])
>
> Do there have better way?
>
> On Thu, Dec 3, 2009 at 5:15 AM, David Pollak
> wrote:
>
>
>
> > Folks (HarryH -- this means you),
>
> > I've just checked in code on the dpp_issue_213 that does Mapper <-> JObject
> > bridging using the awesome lift-json library.
>
> > The methods on MetaMapper:
> > protected def encodeAsJSON_! (toEncode: A): JsonAST.JObject
> > protected def decodeFromJSON_!(json: JsonAST.JObject): A
>
> > Implement the bridge.  They are protected and have a _! in their name
> > because they are *dangerous* in that data can be exposed on the JSON object
> > that you might not want exposed and these methods should be used with
> > extreme caution.
>
> > An example of usage can be found in the MapperSpecs:
>
> > object SampleModel extends SampleModel with KeyedMetaMapper[Long,
> > SampleModel] {
> >   def encodeAsJson(in: SampleModel): JsonAST.JObject = encodeAsJSON_!(in)
> >   def buildFromJson(json: JsonAST.JObject): SampleModel =
> > decodeFromJSON_!(json)
> > }
>
> > class SampleModel extends KeyedMapper[Long, SampleModel] {
> >   def getSingleton = SampleModel // what's the "meta" server
> >   def primaryKeyField = id
>
> >   object id extends MappedLongIndex(this)
> >   object firstName extends MappedString(this, 32)
> >   object moose extends MappedNullableLong(this)
> >   object notNull extends MappedString(this, 32) {
> >     override def dbNotNull_? = true
> >   }
>
> >   def encodeAsJson(): JsonAST.JObject = SampleModel.encodeAsJson(this)
> > }
>
> > So, you can use this mechanism to serialize a Mapper object to JSON, shovel
> > the object into memcached and then pull it out, mutate a field and save the
> > object back to the database (although connection identifier is lost, so if
> > you are sharding your database, this will not work).
>
> > Please give it a try, give me feedback.  I'll put it on review board
> > tomorrow after any feedback and get it into Lift.
>
> > Thanks,
>
> > David
>
> > --
> > Lift, the simply functional web frameworkhttp://liftweb.net
> > Beginning Scalahttp://www.apress.com/book/view/1430219890
> > Follow me:http://twitter.com/dpp
> > Surf the harmonics
>
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> --
> Scala中文社区:  http://groups.google.com/group/scalacn

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