Re: [Zope] Modifying a Dictionaries in an Extenal Method
Edward Huixquic wrote at 2005-6-7 01:11 -0500:
Since you sent your reply not to the list but to my email
That was a mistake. It should have gone to the mailing list...
I dared to
respond directly, let me know if you prefer not to receive direct
emails and sorry if my dare bothered you.
In principle, all Zope related messages should go to a mailing
list and not to me privately...
...
That is why I am passing the REQUEST to the External Method, as to
make it aware of the DTML variables (environment)
REQUEST does *not* know about DTML variables.
, actually the ones
that are created from the MySQLMethod.dictionaries() So, in the
future I will call directly like:
dtml-call MyExternalMethod(MyZSQLMethod.dictionaries())
I am not familiar with dictionaries (it is in fact less
efficient than the use of the result directly).
But, I expect that dictionaries is not a method of
the Z SQLMethod itself but instead of its result.
If I am right, then you must use MyZSQLMethod().dictionaries().
...
Powerful but hard to learn, as you
probably heard before, I am trying to grab that Zope spark...fighting
against namespaces, acquisition, and other abstract Zope concepts.
Maybe, you read
http://www.dieter.handshake.de/pyprojects/zope/book/chap3.html
Thanks for the suggestion. Already reading it.
..
The most natural way, you can imagine: you simple call
your ExternalMethod with this dictionary list as parameter.
dtml-{var|call} expr=myExternalMethod(fields)
Note that DTML performs some magic for its name attributes.
If its value is callable, it automatically calls it.
Inside an expr attribute, there is no such magic.
This means, that you sometimes need to call explicitly (probably
not in your example but sometimes...).
In your example, I understand fields must be preassigned to say,
MyZSQLMethod.dictionaries()
I used the fields from your example.
Whatever it is, you can pass it to an External Method (or
other function like object). You may need to call it explicitly
to get the same effect as you would get when you used it as
a DTML variable, as I explained above.
--
Dieter
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Re: [Zope] Modifying a Dictionaries in an Extenal Method
Thanks Tino for your comments, here are some more comments:
On 6/5/05, Tino Wildenhain [EMAIL PROTECTED] wrote:
cut stuff
def pyUpdate(self,REQUEST):
fields=REQUEST['fields']
x=REQUEST['x']=fields[0]
y=REQUEST['y']=fields[1]
x.balance=5000
y.balance=5000
I dont think the loop above makes any sense :)
Sure it doesn't make any sense. It is just a proof I wrote trying to
find out why the
object I tought as dictionaries where not working as that, turned out
to be records objects.
The common idiom goes like this:
results = [{'balance':balanceexpression(item),
'lastname':item.lastname,
'name':item.name}
for item in context.SomeZSQLMethod()]
for example.
For more advise I think we need the big picture (in english
words) what you are doing here.
What I am trying to do is move towards python external methods (and
eventually products) instead of doing logic in dtml or within the ZMI.
Generally speaking there are SQL queries, gotten via a
ZSQLMetod.dictionaries() and the this list of dictionaries is fed into
my python external method, there is where the loop comes into play
lin something like
for onerecord in someSQLmethod.dictionaries():
processing the individual record code
I just wonder if this is the best approach I must add that there
are also web page designers in the mix, they do the HTML/CSS stuff and
I am supposed to do the database and application logic stuff. I am
just trying to find the best way to organize the sites within Zope ,
separating presentation and logic and making the thing maintanable.
If you have suggestions on some documentation about this subjects in
Zope, it's be well used.
Your comments are welcome. Thanks again
Edward
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Re: [Zope] Modifying a Dictionaries in an Extenal Method
Edward Huixquic wrote at 2005-6-5 19:21 -0500:
...
dtml-if process
dtml-in fields mapping
dtml-call pyUpdate(REQUEST)
Why do you call pyUpdate in a loop?
Well, actually I am getting the fields data from a ZSQLMethod
dictionaries(), so, I am trying to do something to each record (in the
list itself and later on I post changes into the database, hence the
python loop, as shown in the pyUpdate external method i used in my
example.
But the call only references REQUEST. Thus, unless your
fields contain a key REQUEST, the call is independent from
the loop variable -- you will get the same result for each round
in the loop...
As you may have guessed so far, I am a newbie, trying to figure out
this great Zope technology.
An ExternalMethod is almost a Python function -- with almost
no magic (apart from auto passing of self under special conditions).
Especially, an ExternalMethod does not know the DTML namespace
(unless you pass it explicitly). You must pass arguments directly
if you want current values of DTML variables be available in the
ExternalMethod. This is unlike the magic passing of
the DMTL namespace to other DMTL objects (under special conditions).
Powerful but hard to learn, as you
probably heard before, I am trying to grab that Zope spark...fighting
against namespaces, acquisition, and other abstract Zope concepts.
Maybe, you read
http://www.dieter.handshake.de/pyprojects/zope/book/chap3.html
...
In my example, if fields actually come from a
Zsqlmethod.dictionaries() object, what would be the best way to pass
thru all and every single one of the records in the list ?
The most natural way, you can imagine: you simple call
your ExternalMethod with this dictionary list as parameter.
dtml-{var|call} expr=myExternalMethod(fields)
Note that DTML performs some magic for its name attributes.
If its value is callable, it automatically calls it.
Inside an expr attribute, there is no such magic.
This means, that you sometimes need to call explicitly (probably
not in your example but sometimes...).
--
Dieter
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Re: [Zope] Modifying a Dictionaries in an Extenal Method
Am Sonntag, den 05.06.2005, 00:05 -0500 schrieb Edward Huixquic:
Thanks Dieter for your kind reply,
Here is a complete (a bit long, sorry for that) example of what is
happening, here are some code pieces that shows this behavior:
DTML:
--
HTML
BODY
dtml-if process
dtml-in fields mapping
dtml-call pyUpdate(REQUEST)
dtml-var balance
/dtml-in
dtml-var REQUEST
/dtml-if
form name=input_form ./test1
Name: input type=text name=fields.name:records value=Mickeybr
Lastname:input type=text name=fields.lastname:records value=Mousebr
Account Balance:input type=text name=fields.balance:records
value=1000br
brbr
Name: input type=text name=fields.name:records value=Donaldbr
Lastname:input type=text name=fields.lastname:records value=Duckbr
Account Balance:input type=text name=fields.balance:records
value=2000br
input type=submit value=process name=process
/form
/BODY
/HTML
--
Python External Method:
def pyUpdate(self,REQUEST):
for item in range(len(self.REQUEST['fields'])):
self.REQUEST['x']=self.REQUEST['fields'][0]
self.REQUEST['y']=self.REQUEST['fields'][1]
# self.REQUEST['fields'][0]['balance']=5000-I will
refer to this as first line
# self.REQUEST['y']['balance']=5000 this would
be the second line
return self.REQUEST
---
Output of form after pressing the process button WITH both lines
commented out in the External method, as show above (cut from the
whole REQUEST output):
1000 2000
form
process 'process'
fields[{'balance': '1000', 'lastname': 'Mouse', 'name': 'Mickey'},
{'balance': '2000', 'lastname': 'Duck', 'name': 'Donald'}]
cut stuff
fields[{'balance': '1000', 'lastname': 'Mouse', 'name': 'Mickey'},
{'balance': '2000', 'lastname': 'Duck', 'name': 'Donald'}]
y {'balance': '2000', 'lastname': 'Duck', 'name': 'Donald'}
x {'balance': '1000', 'lastname': 'Mouse', 'name': 'Mickey'}
So, fields behaves as a list and X and Y are dictionaries, right?
No. They look like dictionaries, but they are not dictionaries.
You used :records, which gives you lists of record objects.
You can copy to a real dictionary to do what you want.
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Re: [Zope] Modifying a Dictionaries in an Extenal Method
Edward Huixquic wrote at 2005-6-5 00:05 -0500:
...
dtml-if process
dtml-in fields mapping
dtml-call pyUpdate(REQUEST)
Why do you call pyUpdate in a loop?
...
Name: input type=text name=fields.name:records value=Mickeybr
Thus fields becomes a list of ZPublisher.HTTPRequest.record
objects.
...
Python External Method:
def pyUpdate(self,REQUEST):
for item in range(len(self.REQUEST['fields'])):
self.REQUEST['x']=self.REQUEST['fields'][0]
self.REQUEST['y']=self.REQUEST['fields'][1]
# self.REQUEST['fields'][0]['balance']=5000-I will
refer to this as first line
# self.REQUEST['y']['balance']=5000 this would
be the second line
return self.REQUEST
Ouch! This code hurts my eyes!
I suggest, you avoid code duplication -- this is more efficient
and more readable:
def pyUpdate(self,REQUEST):
fields = REQUEST['fields']
for item in range(len(fields)):
REQUEST['x'] = fields[0]
y =REQUEST['y'] = fields[1]
fields[0].balance = 5000
y.balance = 5000
This is not much more readable, isn't it?
It is still stupid to execute the assignments in a loop (as
they are indepentent of the loop variable) but I assume
that you simple provides some example code (you hopefully
do not use in your real program).
...
y {'balance': '2000', 'lastname': 'Duck', 'name': 'Donald'}
x {'balance': '1000', 'lastname': 'Mouse', 'name': 'Mickey'}
So, fields behaves as a list and X and Y are dictionaries, right?
They look like dictionaries but are in
fact ZPublisher.HTTPRequest.record instances.
...
--
Output with first line the python external methods NOT commented out:
* Module Products.ExternalMethod.ExternalMethod, line 232, in __call__
__traceback_info__: ((HTTPRequest,
URL=http://mo2:8080/mytestfolder/modules/test1,), {}, None)
* Module /usr/local/Zope-2.7.4/instance1/Extensions/generator.py,
line 577, in pyUpdate
* Module ZPublisher.HTTPRequest, line 1502, in __getattr__
AttributeError: __setitem__
The reason for this error is that record objects
do not support item assignment (although otherwise they try to emulate
dictionaries). Use record.attr = value rather than
record['attr'] = value.
--
Dieter
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Re: [Zope] Modifying a Dictionaries in an Extenal Method
Dieter: Thanks again for your time and your excellent help.
Below are some comments of my own to yours message, (hope the post
doesn't become too mangled and hard to read).
On 6/5/05, Dieter Maurer [EMAIL PROTECTED] wrote:
Edward Huixquic wrote at 2005-6-5 00:05 -0500:
...
dtml-if process
dtml-in fields mapping
dtml-call pyUpdate(REQUEST)
Why do you call pyUpdate in a loop?
Well, actually I am getting the fields data from a ZSQLMethod
dictionaries(), so, I am trying to do something to each record (in the
list itself and later on I post changes into the database, hence the
python loop, as shown in the pyUpdate external method i used in my
example.
As you may have guessed so far, I am a newbie, trying to figure out
this great Zope technology. Powerful but hard to learn, as you
probably heard before, I am trying to grab that Zope spark...fighting
against namespaces, acquisition, and other abstract Zope concepts.
...
Name: input type=text name=fields.name:records value=Mickeybr
Thus fields becomes a list of ZPublisher.HTTPRequest.record
objects.
Got it, no dictionarries then its a totally different object type that
just has a dictionary looks. !
...
Python External Method:
def pyUpdate(self,REQUEST):
for item in range(len(self.REQUEST['fields'])):
self.REQUEST['x']=self.REQUEST['fields'][0]
self.REQUEST['y']=self.REQUEST['fields'][1]
# self.REQUEST['fields'][0]['balance']=5000-I will
refer to this as first line
# self.REQUEST['y']['balance']=5000 this would
be the second line
return self.REQUEST
Ouch! This code hurts my eyes!
Mine also hurt (maybe a bit less than yours,:) ) even I am a newbie,
I wrote it that way in my example as to make sure there were no weird
things happening in between wach assignment (more weird things than I
already had in hand) . x and y are of course very bad variable
names and the sample code I wrote really hurts, as you said.
I suggest, you avoid code duplication -- this is more efficient
and more readable:
def pyUpdate(self,REQUEST):
fields = REQUEST['fields']
for item in range(len(fields)):
REQUEST['x'] = fields[0]
y =REQUEST['y'] = fields[1]
fields[0].balance = 5000
y.balance = 5000
This is not much more readable, isn't it?
Readable, you bet, Efficient: don't know yet, now I know since you
mentioned, but I just gotta field test it, that is for sure part of
the Python learning process as well.
It is still stupid to execute the assignments in a loop (as
they are indepentent of the loop variable) but I assume
that you simple provides some example code (you hopefully
do not use in your real program).
. Actually I have done some little programs like this, I must confess.
In my example, if fields actually come from a
Zsqlmethod.dictionaries() object, what would be the best way to pass
thru all and every single one of the records in the list ?
...
y {'balance': '2000', 'lastname': 'Duck', 'name': 'Donald'}
x {'balance': '1000', 'lastname': 'Mouse', 'name': 'Mickey'}
So, fields behaves as a list and X and Y are dictionaries, right?
They look like dictionaries but are in
fact ZPublisher.HTTPRequest.record instances.
Note Taken !
Thanks again for your help and time, I really appreciate you taking
the time to helo all of us newbies on this list. Best regards.
Edward
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Re: [Zope] Modifying a Dictionaries in an Extenal Method
Corporate Email Corp. wrote at 2005-6-3 17:30 -0500:
Does Zope allos an external method to modify a dictionary object that
is passed to the external method via the REQUEST object.
Zope does not restrict an External Method in any way.
...
items_list = [{'element1':'element1value',
'element2':'element2value','element3': element3value},{},]
I am getting trouble with with this as any time I try to modify any
dictionary from items_list, items_list[n] I do get an error
similar to:
line 120, in agregaItemDicts def agregaItemLista2(self,item,REQUEST):
File /usr/local/Zope-2.7.4/lib/python/ZPublisher/HTTPRequest.py,
line 1502, in __getattr__ raise AttributeError, key AttributeError:
__setitem__
Usually, this means that the object looks like
a dictionary but is in fact a different object.
However, your traceback is weird:
It seems to indicate that
HTTPRequest.HTTPRequest.__getattr__('__setitem__')
was called.
However, HTTPRequest.HTTPRequest does have a __setitem__
attribute. Therefore, Python will never call
__getattr__ automatically to resolve __setitem__.
Something else must have called __getattr__ inadequately.
The upper part of traceback (which you dropped) should
tell you where this calls happens.
--
Dieter
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Re: [Zope] Modifying a Dictionaries in an Extenal Method
Thanks Dieter for your kind reply,
Here is a complete (a bit long, sorry for that) example of what is
happening, here are some code pieces that shows this behavior:
DTML:
--
HTML
BODY
dtml-if process
dtml-in fields mapping
dtml-call pyUpdate(REQUEST)
dtml-var balance
/dtml-in
dtml-var REQUEST
/dtml-if
form name=input_form ./test1
Name: input type=text name=fields.name:records value=Mickeybr
Lastname:input type=text name=fields.lastname:records value=Mousebr
Account Balance:input type=text name=fields.balance:records
value=1000br
brbr
Name: input type=text name=fields.name:records value=Donaldbr
Lastname:input type=text name=fields.lastname:records value=Duckbr
Account Balance:input type=text name=fields.balance:records
value=2000br
input type=submit value=process name=process
/form
/BODY
/HTML
--
Python External Method:
def pyUpdate(self,REQUEST):
for item in range(len(self.REQUEST['fields'])):
self.REQUEST['x']=self.REQUEST['fields'][0]
self.REQUEST['y']=self.REQUEST['fields'][1]
# self.REQUEST['fields'][0]['balance']=5000-I will
refer to this as first line
# self.REQUEST['y']['balance']=5000 this would
be the second line
return self.REQUEST
---
Output of form after pressing the process button WITH both lines
commented out in the External method, as show above (cut from the
whole REQUEST output):
1000 2000
form
process 'process'
fields [{'balance': '1000', 'lastname': 'Mouse', 'name': 'Mickey'},
{'balance': '2000', 'lastname': 'Duck', 'name': 'Donald'}]
cut stuff
fields [{'balance': '1000', 'lastname': 'Mouse', 'name': 'Mickey'},
{'balance': '2000', 'lastname': 'Duck', 'name': 'Donald'}]
y {'balance': '2000', 'lastname': 'Duck', 'name': 'Donald'}
x {'balance': '1000', 'lastname': 'Mouse', 'name': 'Mickey'}
So, fields behaves as a list and X and Y are dictionaries, right?
--
Output with first line the python external methods NOT commented out:
Traceback (innermost last):
* Module ZPublisher.Publish, line 101, in publish
* Module ZPublisher.mapply, line 88, in mapply
* Module ZPublisher.Publish, line 39, in call_object
* Module OFS.DTMLDocument, line 128, in __call__
DTMLDocument instance at b455ce00
URL: http://machineX:8080/mytestfolder/modules/test1/manage_main
Physical Path:/mytestfolder/modules/test1
* Module DocumentTemplate.DT_String, line 474, in __call__
* Module DocumentTemplate.DT_In, line 703, in renderwob
* Module DocumentTemplate.DT_Util, line 198, in eval
__traceback_info__: pyUpdate
* Module string, line 1, in expression
* Module Products.ExternalMethod.ExternalMethod, line 232, in __call__
__traceback_info__: ((HTTPRequest,
URL=http://mo2:8080/mytestfolder/modules/test1,), {}, None)
* Module /usr/local/Zope-2.7.4/instance1/Extensions/generator.py,
line 577, in pyUpdate
* Module ZPublisher.HTTPRequest, line 1502, in __getattr__
AttributeError: __setitem__
--
Output with only the second line the python external methods NOT commented out:
Traceback (innermost last):
* Module ZPublisher.Publish, line 101, in publish
* Module ZPublisher.mapply, line 88, in mapply
* Module ZPublisher.Publish, line 39, in call_object
* Module OFS.DTMLDocument, line 128, in __call__
DTMLDocument instance at b455ce00
URL: http://machineX:8080/mytestfolder/modules/test1/manage_main
Physical Path:/mytestfolder/modules/test1
* Module DocumentTemplate.DT_String, line 474, in __call__
* Module DocumentTemplate.DT_In, line 703, in renderwob
* Module DocumentTemplate.DT_Util, line 198, in eval
__traceback_info__: pyUpdate
* Module string, line 1, in expression
* Module Products.ExternalMethod.ExternalMethod, line 232, in __call__
__traceback_info__: ((HTTPRequest,
URL=http://mo2:8080/prova/modulos/pruebas/test1,), {}, None)
* Module /usr/local/Zope-2.7.4/instance1/Extensions/generator.py,
line 578, in pyUpdate
* Module ZPublisher.HTTPRequest, line 1502, in __getattr__
AttributeError: __setitem__
-
Nevertheless I can do an append to the fields list with this Extenal Method:
def pyUpdate(self,REQUEST):
self.REQUEST['fields'].append({'dictnew':'dictnewdata'})
return self.REQUEST
The only weird thing is that I get the new dictionary added a number
of times that equals the number of records on the form. Like this cut
from the REQUEST, when I had three records in the form:
form
process 'process'
fields [{'balance': '1000', 'lastname': 'Mouse', 'name': 'Mickey'},
{'balance': '2000',
[Zope] Modifying a Dictionaries in an Extenal Method
Zopistas:
Does Zope allos an external method to modify a dictionary object that
is passed to the external method via the REQUEST object.
I am working with the object:
items_list = [{'element1':'element1value',
'element2':'element2value','element3': element3value},{},]
I am getting trouble with with this as any time I try to modify any
dictionary from items_list, items_list[n] I do get an error
similar to:
line 120, in agregaItemDicts def agregaItemLista2(self,item,REQUEST):
File /usr/local/Zope-2.7.4/lib/python/ZPublisher/HTTPRequest.py,
line 1502, in __getattr__ raise AttributeError, key AttributeError:
__setitem__
It looks like the dictionary is behaving as if it not were a mutable
object (as it is in Python), I have no trouble modifying the list
'items_list' itself.
i have read a bit about dictionaries persistence and calling
_p_changed=1 bu have not had any luck so far. I am using an
external method, not a product.
Any ideas would be appreciated..
Best regards.
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