[Rails] Re: can't get a simple partial to work !...@#!$!!
7stud -- wrote: Corrections/clarification: > > I explained why I got the error. It was because I ended up with two > conflicting render statements, one in the layout and one in the index > view: > > render(:partial => "test", :object => @array) > render(:partial => "test", :collection => @array) > > Apparently, that confused rails. The error had nothing to do with the > fact that 'test' wasn't previously defined somewhere in my code. > -- Posted via http://www.ruby-forum.com/. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk@googlegroups.com To unsubscribe from this group, send email to rubyonrails-talk+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~--~~~~--~~--~--~---
[Rails] Re: can't get a simple partial to work !...@#!$!!
Frederick Cheung wrote:
> On May 10, 6:35�am, 7stud -- wrote:
>> random_name can be accessed in the partial _random_name.html.erb. �In
>> addition, my tests show that @var can be accessed in
>> _random_name.html.erb as well. �I'm not sure why you would want to stuff
>> the value of @var into another variable when you can just access @var
>> directly. �Switching the names seems confusing to me.
>>
>
> because depending on the state of local variables makes your partial
> more dependant on its environment. For example if the random_name
> partial always used @var you couldn't use it to render a collection or
> if the thing that you wanted to render was @something.something_else.
> Personally I mostly equate this to 'why use method arguments when you
> could just use global variables?'
>
Ah. I see.
AGoofin wrote:
> Perhaps you should look at the whole of DHH wrote. It is perhaps
> something like: render :partial => 'test' or has a :test => @var
> clause to give the test variable.
>
This is what he wrote:
The :object parameter to render takes an object that is assigned to a
local variable with the same name as the partial. So, in the layout we
could call this:
<%= render(:partial => "cart", :object => @cart) %>
and in the _cart.html.erb template, we can refer to the cart via the
variable cart.
p. 120, AWDWR(3rd)
-
My tests show that the :partial name can be anything, e.g.
"forrest_gump", and then inside the file _forrest_gump.html.erb, a
variable named forrest_gump will be available and it will be assigned
whatever value is specified for :object.
In addition, my tests show that *all* the @variables that are set in the
controller are available in the partial file no matter what I write in
the render() statement. Therefore, a statement such as this:
> For example, render :partial => 'foo' passes the instance variable
> named @foo to the partial where I can then say: for f in @foo.
does not suddenly make @foo available in the partial. @foo is also
available in the partial already. For instance, if I write:
render :partial => "red"
I can still access @foo in the file _red.html.erb.
> The code you posted doesn't contain any variable named test, otherwise
> you wouldn't get the error in the first place.
>
I explained why I got the error. It was because I ended up with two
conflicting render statements, one in the layout and one in the index
view:
render(:partial => "some_name", :object => @var)
render(:partial => "some_name", :collection => @var)
Apparently, that confused rails. The error had nothing to do with the
fact that 'test' wasn't previously defined somewhere in my code.
> If you don't want help - why post here?
>
Don't get offended just because a beginner can't confirm how you say
rails works. I don't blindly accept what someone says. I test things
out to see how they work for myself. If my test results don't confirm
what I've been told, then I ask questions.
> Variable names are special - they don't just appear and have to be created.
Is it so hard to believe that rails could create a variable when given a
string, like here:
partial => "forrest_gump"
I can do it:
class A
end
a = A.new
str = "forrest_gump"
val = [1, 2, 3]
a.instance_variable_set("@#{str}", val)
eval("
class << a
attr_accessor :#{str}
end")
p a.forrest_gump
--output:--
[1, 2, 3]
I don't know if things work differently in rails 2.3.2, which is what I
am using.
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[Rails] Re: can't get a simple partial to work !...@#!$!!
Perhaps you should look at the whole of DHH wrote. It is perhaps something like: render :partial => 'test' or has a :test => @var clause to give the test variable. The code you posted doesn't contain any variable named test, otherwise you wouldn't get the error in the first place. If you want the code to work, replace 'test' in the index view with '@array' On May 10, 1:35 am, 7stud -- wrote: > AGoofin wrote: > > When you render a partial you automagically get an object with the > > same name available in the partial > > > For example, render :partial => 'foo' passes the instance variable > > named @foo to the partial where I can then say: for f in @foo. > > How do you know that @foo isn't already available to all the views and > that writing render(:partial => foo) doesn't have any effect whatsoever > on whether @foo is available in the partial? > > > In your first post you iterate over 'test' but that variable isn't > > created anywhere. > > Sure it is. Try it. I'm just a beginner but my Dave Heinemeier Hansson > book says the variable test gets created by the render() statement, and > my tests confirm that's the way it works. More generally, when I write > > <% render(:partial => "random_name", :object => @var) %> > > and @var was assigned a value in the controller, then I find that the > value of @var gets assigned to the variable "random name", and > random_name can be accessed in the partial _random_name.html.erb. In > addition, my tests show that @var can be accessed in > _random_name.html.erb as well. I'm not sure why you would want to stuff > the value of @var into another variable when you can just access @var > directly. Switching the names seems confusing to me. > > -- > Posted viahttp://www.ruby-forum.com/. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk@googlegroups.com To unsubscribe from this group, send email to rubyonrails-talk+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~--~~~~--~~--~--~---
[Rails] Re: can't get a simple partial to work !...@#!$!!
On May 10, 6:35 am, 7stud -- wrote: > AGoofin wrote: > > Sure it is. Try it. I'm just a beginner but my Dave Heinemeier Hansson > book says the variable test gets created by the render() statement, and > my tests confirm that's the way it works. More generally, when I write > > <% render(:partial => "random_name", :object => @var) %> > > and @var was assigned a value in the controller, then I find that the > value of @var gets assigned to the variable "random name", and > random_name can be accessed in the partial _random_name.html.erb. In > addition, my tests show that @var can be accessed in > _random_name.html.erb as well. I'm not sure why you would want to stuff > the value of @var into another variable when you can just access @var > directly. Switching the names seems confusing to me. > because depending on the state of local variables makes your partial more dependant on its environment. For example if the random_name partial always used @var you couldn't use it to render a collection or if the thing that you wanted to render was @something.something_else. Personally I mostly equate this to 'why use method arguments when you could just use global variables?' Fred --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk@googlegroups.com To unsubscribe from this group, send email to rubyonrails-talk+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~--~~~~--~~--~--~---
[Rails] Re: can't get a simple partial to work !...@#!$!!
AGoofin wrote: > When you render a partial you automagically get an object with the > same name available in the partial > > For example, render :partial => 'foo' passes the instance variable > named @foo to the partial where I can then say: for f in @foo. > How do you know that @foo isn't already available to all the views and that writing render(:partial => foo) doesn't have any effect whatsoever on whether @foo is available in the partial? > In your first post you iterate over 'test' but that variable isn't > created anywhere. > Sure it is. Try it. I'm just a beginner but my Dave Heinemeier Hansson book says the variable test gets created by the render() statement, and my tests confirm that's the way it works. More generally, when I write <% render(:partial => "random_name", :object => @var) %> and @var was assigned a value in the controller, then I find that the value of @var gets assigned to the variable "random name", and random_name can be accessed in the partial _random_name.html.erb. In addition, my tests show that @var can be accessed in _random_name.html.erb as well. I'm not sure why you would want to stuff the value of @var into another variable when you can just access @var directly. Switching the names seems confusing to me. -- Posted via http://www.ruby-forum.com/. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk@googlegroups.com To unsubscribe from this group, send email to rubyonrails-talk+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~--~~~~--~~--~--~---
[Rails] Re: can't get a simple partial to work !...@#!$!!
When you render a partial you automagically get an object with the same name available in the partial For example, render :partial => 'foo' passes the instance variable named @foo to the partial where I can then say: for f in @foo. In your first post you iterate over 'test' but that variable isn't created anywhere. Using: for a in @array might work providing that the partial is part of that controller though. Or rename @array to @test. I don't know how many times I have stopped and looked for the painfully obvious - like with RESTful resources - the key is to make that part of the trouble shooting. On May 9, 1:47 am, 7stud -- wrote: > Rick Lloyd wrote: > > views/store/index.html.erb: > > > <%= render(:partial => "layouts/test", :object => @array) %> > > > views/layouts/_test.html.erb: > > > <% for num in test %> > > <%= num %> > > <% end %> > > Sorry, I don't know what that means, and I still can't solve my > original problem, which led to the test code in my op. Here is what I > have now: > > class StoreController < ApplicationController > def index > @products = Product.find(:all) > end > > def add_to_cart > @cart = [1, 2, 3] > end > end > > layouts/store.html.erb > --- > "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd";> > > http://www.w3.org/1999/xhtml"; xml:lang="en" lang="en"> > > > <% @page_title || "Store" %> > <%= stylesheet_link_tag 'scaffold', 'store2.css' %> > > > > <%= render(:partial => "cart", :object => @cart) %> > > > > > views/store/_cart.html.erb > --- > <% for num in cart -%> > <%= num %> > <% end %> > > When I go tohttp://localhost:3000/storein my browser, I get this: > - > NoMethodError in Store#index > > Showing app/views/store/_cart.html.erb where line #1 raised: > > You have a nil object when you didn't expect it! > You might have expected an instance of Array. > The error occurred while evaluating nil.each > > Extracted source (around line #1): > > 1: <% for num in cart -%> > 2: <%= num %> > 3: <% end %> > > Trace of template inclusion: app/views/layouts/store.html.erb > -- > > -- > Posted viahttp://www.ruby-forum.com/. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk@googlegroups.com To unsubscribe from this group, send email to rubyonrails-talk+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~--~~~~--~~--~--~---
[Rails] Re: can't get a simple partial to work !...@#!$!!
Maybe you should send the var through each page, you need to store it
and get it by method.
store it:
:locals => {:var = @a}
get it:
var = local_assigns[:var]
On May 10, 2:21 am, 7stud -- wrote:
> 7stud -- wrote:
> > Frederick Cheung wrote:
> >> On May 9, 6:47 am, 7stud -- wrote:
>
> >>> @cart = [1, 2, 3]
> >>> end
> >>> end
>
> >> if you go to /store that's just the index action
>
> > Yes. I realize that>
>
> >> so add_to_cart is
> >> never called and @cart is not set.
>
> > Ok, but if I go to /store/index why does the add_to_cart view ever come
> > into play? @ variables in other actions are not set when /store/index
> > executes, so why doesn't rails throw errors when their views reference
> > the @ variables set in their actions?
>
> Ai yi yi. I'm putting the partial in the store *layout* so all the
> store views use it--including the index view.
>
> Thanks.
> --
> Posted viahttp://www.ruby-forum.com/.
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[Rails] Re: can't get a simple partial to work !...@#!$!!
7stud -- wrote: > Frederick Cheung wrote: >> On May 9, 6:47�am, 7stud -- wrote: >>> >>> � � @cart = [1, 2, 3] >>> � end >>> end >>> >> >> if you go to /store that's just the index action > > Yes. I realize that> > >> so add_to_cart is >> never called and @cart is not set. >> > > > Ok, but if I go to /store/index why does the add_to_cart view ever come > into play? @ variables in other actions are not set when /store/index > executes, so why doesn't rails throw errors when their views reference > the @ variables set in their actions? Ai yi yi. I'm putting the partial in the store *layout* so all the store views use it--including the index view. Thanks. -- Posted via http://www.ruby-forum.com/. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk@googlegroups.com To unsubscribe from this group, send email to rubyonrails-talk+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~--~~~~--~~--~--~---
[Rails] Re: can't get a simple partial to work !...@#!$!!
Frederick Cheung wrote: > On May 9, 6:47�am, 7stud -- wrote: >> >> � � @cart = [1, 2, 3] >> � end >> end >> > > if you go to /store that's just the index action Yes. I realize that> > so add_to_cart is > never called and @cart is not set. > Ok, but if I go to /store/index why does the add_to_cart view ever come into play? @ variables in other actions are not set when /store/index executes, so why doesn't rails throw errors when their views reference the @ variables set in their actions? -- Posted via http://www.ruby-forum.com/. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk@googlegroups.com To unsubscribe from this group, send email to rubyonrails-talk+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~--~~~~--~~--~--~---
[Rails] Re: can't get a simple partial to work !...@#!$!!
On May 9, 6:47 am, 7stud -- wrote: > Rick Lloyd wrote: > > views/store/index.html.erb: > > > <%= render(:partial => "layouts/test", :object => @array) %> > > > views/layouts/_test.html.erb: > > > <% for num in test %> > > <%= num %> > > <% end %> > > Sorry, I don't know what that means, and I still can't solve my > original problem, which led to the test code in my op. Here is what I > have now: > > class StoreController < ApplicationController > def index > @products = Product.find(:all) > end > > def add_to_cart > @cart = [1, 2, 3] > end > end > if you go to /store that's just the index action so add_to_cart is never called and @cart is not set. Fred --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk@googlegroups.com To unsubscribe from this group, send email to rubyonrails-talk+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~--~~~~--~~--~--~---
[Rails] Re: can't get a simple partial to work !...@#!$!!
2009/5/9 7stud --
>
> Colin Law wrote:
> > To achieve this I use the syntax
> >
> > <%= render :partial => 'cart', :locals => {:mycart = @cart} %>
> >
>
> I think that is supposed to be:
>
> <%= render :partial => 'cart', :locals => {:mycart => @cart} %>
>
True, this (as corrected) works fine for me on rails 2.2.2. Which version
are you using?
>
> > Then use the variable mycart in the partial
> >
>
> and that produces the same error:
> -
> NoMethodError in Store#index
>
> Showing app/views/store/_cart.html.erb where line #1 raised:
>
> You have a nil object when you didn't expect it!
> You might have expected an instance of Array.
> The error occurred while evaluating nil.each
>
> Extracted source (around line #1):
>
> 1: <% for num in mycart -%>
> 2: <%= num %>
> 3: <% end %>
>
> Trace of template inclusion: app/views/layouts/store.html.erb
>
> RAILS_ROOT: /Users/autie/2testing/dir1/rails/store2
> ---
>
> By the way, my file views/store/add_to_cart.html.erb is blank, although
> I don't think that matters since the layout does not yield.
> --
> Posted via http://www.ruby-forum.com/.
>
> >
>
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[Rails] Re: can't get a simple partial to work !...@#!$!!
hi,
try this:
7stud -- wrote:
>
> <%= render :partial => 'cart', :locals => {:mycart => @cart} %>
<%= render :partial => 'cart', :collection => @cart %>
>> Then use the variable mycart in the partial
views/store/_cart.html.erb
---
<%= cart %>
tom
--
===
Tomas Meinlschmidt, MS {MCT, MCP+I, MCSE, AER}, NetApp Filer/NetCache
www.meinlschmidt.com www.maxwellrender.cz www.lightgems.cz
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[Rails] Re: can't get a simple partial to work !...@#!$!!
Colin Law wrote:
> To achieve this I use the syntax
>
> <%= render :partial => 'cart', :locals => {:mycart = @cart} %>
>
I think that is supposed to be:
<%= render :partial => 'cart', :locals => {:mycart => @cart} %>
> Then use the variable mycart in the partial
>
and that produces the same error:
-
NoMethodError in Store#index
Showing app/views/store/_cart.html.erb where line #1 raised:
You have a nil object when you didn't expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.each
Extracted source (around line #1):
1: <% for num in mycart -%>
2: <%= num %>
3: <% end %>
Trace of template inclusion: app/views/layouts/store.html.erb
RAILS_ROOT: /Users/autie/2testing/dir1/rails/store2
---
By the way, my file views/store/add_to_cart.html.erb is blank, although
I don't think that matters since the layout does not yield.
--
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[Rails] Re: can't get a simple partial to work !...@#!$!!
To achieve this I use the syntax
<%= render :partial => 'cart', :locals => {:mycart = @cart} %>
Then use the variable mycart in the partial
Colin
2009/5/9 7stud --
>
> Rick Lloyd wrote:
> > views/store/index.html.erb:
> >
> > <%= render(:partial => "layouts/test", :object => @array) %>
> >
> > views/layouts/_test.html.erb:
> >
> > <% for num in test %>
> > <%= num %>
> > <% end %>
>
> Sorry, I don't know what that means, and I still can't solve my
> original problem, which led to the test code in my op. Here is what I
> have now:
>
> class StoreController < ApplicationController
> def index
> @products = Product.find(:all)
> end
>
> def add_to_cart
>@cart = [1, 2, 3]
> end
> end
>
>
> layouts/store.html.erb
> ---
>"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd";>
>
> http://www.w3.org/1999/xhtml"; xml:lang="en" lang="en">
>
>
> <% @page_title || "Store" %>
> <%= stylesheet_link_tag 'scaffold', 'store2.css' %>
>
>
>
> <%= render(:partial => "cart", :object => @cart) %>
>
>
>
>
>
> views/store/_cart.html.erb
> ---
> <% for num in cart -%>
> <%= num %>
> <% end %>
>
>
> When I go to http://localhost:3000/store in my browser, I get this:
> -
> NoMethodError in Store#index
>
> Showing app/views/store/_cart.html.erb where line #1 raised:
>
> You have a nil object when you didn't expect it!
> You might have expected an instance of Array.
> The error occurred while evaluating nil.each
>
> Extracted source (around line #1):
>
> 1: <% for num in cart -%>
> 2: <%= num %>
> 3: <% end %>
>
> Trace of template inclusion: app/views/layouts/store.html.erb
> --
>
> --
> Posted via http://www.ruby-forum.com/.
>
> >
>
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[Rails] Re: can't get a simple partial to work !...@#!$!!
Rick Lloyd wrote: > views/store/index.html.erb: > > <%= render(:partial => "layouts/test", :object => @array) %> > > views/layouts/_test.html.erb: > > <% for num in test %> > <%= num %> > <% end %> Sorry, I don't know what that means, and I still can't solve my original problem, which led to the test code in my op. Here is what I have now: class StoreController < ApplicationController def index @products = Product.find(:all) end def add_to_cart @cart = [1, 2, 3] end end layouts/store.html.erb --- http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd";> http://www.w3.org/1999/xhtml"; xml:lang="en" lang="en"> <% @page_title || "Store" %> <%= stylesheet_link_tag 'scaffold', 'store2.css' %> <%= render(:partial => "cart", :object => @cart) %> views/store/_cart.html.erb --- <% for num in cart -%> <%= num %> <% end %> When I go to http://localhost:3000/store in my browser, I get this: - NoMethodError in Store#index Showing app/views/store/_cart.html.erb where line #1 raised: You have a nil object when you didn't expect it! You might have expected an instance of Array. The error occurred while evaluating nil.each Extracted source (around line #1): 1: <% for num in cart -%> 2: <%= num %> 3: <% end %> Trace of template inclusion: app/views/layouts/store.html.erb -- -- Posted via http://www.ruby-forum.com/. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk@googlegroups.com To unsubscribe from this group, send email to rubyonrails-talk+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~--~~~~--~~--~--~---
[Rails] Re: can't get a simple partial to work !...@#!$!!
views/store/index.html.erb: <%= render(:partial => "layouts/test", :object => @array) %> views/layouts/_test.html.erb: <% for num in test %> <%= num %> <% end %> On May 8, 5:59 pm, 7stud -- wrote: > class StoreController < ApplicationController > def index > @array = [1, 2, 3] > end > > end > > index.html.erb > - > render(:partial => "test", :object => @array) > > _test.html.erb > > <% for num in test %> > <%= num %> > <% end %> > > When I enter the url: > > http://localhost:3000/store > > in my browser, this is the output: > > - > NoMethodError in Store#index > > Showing app/views/store/_test.html.erb where line #1 raised: > > You have a nil object when you didn't expect it! > You might have expected an instance of Array. > The error occurred while evaluating nil.each > > Extracted source (around line #1): > > 1: <% for num in test %> > 2: <%= num %> > 3: <% end %> > - > > The error is saying that test is nil. A ruby program: > > array = [1, 2, 3] > > for num in array > puts num > end > > --output:-- > 1 > 2 > 3 > > My understanding was that when you write: > > render(:partial => "test", :object => @array) > > then inside the file _test.html.erb a local variable called test is > assigned the object @array. But in my application, @array is not > nil--it was assigned the array [1, 2, 3] in the controller. Why won't > rails relent and loop through the array like I am commanding it to do? > -- > Posted viahttp://www.ruby-forum.com/. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk@googlegroups.com To unsubscribe from this group, send email to rubyonrails-talk+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~--~~~~--~~--~--~---
[Rails] Re: can't get a simple partial to work !...@#!$!!
I figured it out. I wasn't careful about where I was putting render(). I variously tried putting it in index.html.erb and in the layout (layouts/store.html.erb). I ended up with render() in both files: one specifying :object and one using :collection. !...@#$!@#...@#$#!@@#...@# -- Posted via http://www.ruby-forum.com/. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk@googlegroups.com To unsubscribe from this group, send email to rubyonrails-talk+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~--~~~~--~~--~--~---
