Rails - Jan 2008 - problem when editing record in polymorphic relation

I have the following three models created applying the polymorphic
concept
=========================================================================
class SoftwareCi < ActiveRecord::Base
  has_one :ci, :as => :content
end

class HardwareCi < ActiveRecord::Base
has_one :ci, :as => :content
end


class Ci < ActiveRecord::Base
  belongs_to :content, :polymorphic => true
end

The table, cis ,contains the following records
============================================
id | ci_number | content_id | content_type
----+----------+-----------+------------+--------------
  1 | CI1       |          1 | SoftwareCi
  2 | CI2       |          2 | SoftwareCi
  3 | CI3       |          1 | HardwareCi
  4 | CI4       |          2 | HardwareCi


The table, software_cis ,contains the following records
====================================================
id |     asset_tag     | status  | version
----+-------------------+---------+---------
  1 | AC Logix - AT1    | Status2 | 1.0
  2 | RR Logix   AT2    | Status3 | 2.3


The table, hardware_cis ,contains the following records
====================================================
id |     asset_tag     | status  | version
----+-------------------+---------+---------
  1 | HCL - AT1         | Status1 | 1.0
  2 | IBM - AT2         | Status1 | 2.3


The controller, ci_controller, contains the edit method as follows
===============================================================
def edit
@ci=Ci.find(1)
end


My Problem
==========In the edit.rhtml file, I am trying to populate the value of
''version'',
an attribute in the software_ci table which is represented by the
content_type, SotwareCi. The sample code is given below.

<%= text_field ci.content, "version", "size" => 20
%>

I am assuming ''ci.content'' in the above code will represent
the model
and ''version'' will represent the attribute of that model.

When executed the above code didn''t work.
What is wrong here? How I have to proceed?
If we want to simply display the value of ci.content.version, it works
but when tried to edit, it doesn''t work


Thanks in advance for your help
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On 2 Jan 2008, at 14:22, Venu Vallayil wrote:
>
> My Problem
> ==========> In the edit.rhtml file, I am trying to populate the value of
> ''version'',
> an attribute in the software_ci table which is represented by the
> content_type, SotwareCi. The sample code is given below.
>
> <%= text_field ci.content, "version", "size" =>
20 %>
>
text_field doesn''t work that way - it expects the first parameter to  
be the name of an instance variable
You should look into form_for since it allows you to escape that  
convention

Fred
> I am assuming ''ci.content'' in the above code will
represent the model
> and ''version'' will represent the attribute of that model.
>
> When executed the above code didn''t work.
> What is wrong here? How I have to proceed?
> If we want to simply display the value of ci.content.version, it works
> but when tried to edit, it doesn''t work
>
>
> Thanks in advance for your help
> -- 
> Posted via http://www.ruby-forum.com/.
>
> >

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Frederick Cheung wrote:
> On 2 Jan 2008, at 14:22, Venu Vallayil wrote:
>>
>> My Problem
>> ==========>> In the edit.rhtml file, I am trying to populate the
value of
>> ''version'',
>> an attribute in the software_ci table which is represented by the
>> content_type, SotwareCi. The sample code is given below.
>>
>> <%= text_field ci.content, "version", "size"
=> 20 %>
>>
> text_field doesn''t work that way - it expects the first parameter
to
> be the name of an instance variable
> You should look into form_for since it allows you to escape that
> convention
> 
> Fred
I created as follows but didn''t work

<% form_for :ci, @ci, :url => { :action => "update" } do |f|
%>
    CI Name:  <%= f.content.text_field :name %>
<% end %>

Thanks
Venu
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On 2 Jan 2008, at 14:57, Venu Vallayil wrote:
>
> Frederick Cheung wrote:
>> On 2 Jan 2008, at 14:22, Venu Vallayil wrote:
>>>
>>> My Problem
>>> ==========>>> In the edit.rhtml file, I am trying to
populate the value of
>>> ''version'',
>>> an attribute in the software_ci table which is represented by the
>>> content_type, SotwareCi. The sample code is given below.
>>>
>>> <%= text_field ci.content, "version", "size"
=> 20 %>
>>>
>> text_field doesn''t work that way - it expects the first
parameter to
>> be the name of an instance variable
>> You should look into form_for since it allows you to escape that
>> convention
>>
>> Fred
>
> I created as follows but didn''t work
>
> <% form_for :ci, @ci, :url => { :action => "update" } do
|f| %>
>    CI Name:  <%= f.content.text_field :name %>
> <% end %>
That doesn''t mean anything - you need
form_for :co, @ci.content, ... do |f|
f.text_field :name
end

If the form as a whole should apply to ci rather than its content then  
you can use fields_for to create the fields (without creating the  
<form> tag)

Fred

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Frederick Cheung wrote:
> On 2 Jan 2008, at 14:57, Venu Vallayil wrote:
> 
>>>>
>>
>> <% form_for :ci, @ci, :url => { :action => "update"
} do |f| %>
>>    CI Name:  <%= f.content.text_field :name %>
>> <% end %>
> 
> That doesn''t mean anything - you need
> form_for :co, @ci.content, ... do |f|
> f.text_field :name
> end
> 
> If the form as a whole should apply to ci rather than its content then
> you can use fields_for to create the fields (without creating the
> <form> tag)
> 
> Fred
Fred......will you be able to show me a sample code that tells how a 
record is to be edited when there exists a polymorphic relation as shown 
in the starting thread of this talk

Thanks
Venu
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On 2 Jan 2008, at 15:34, Venu Vallayil wrote:
>
> Frederick Cheung wrote:
>> On 2 Jan 2008, at 14:57, Venu Vallayil wrote:
>>
>>>>>
>>>
>>> <% form_for :ci, @ci, :url => { :action =>
"update" } do |f| %>
>>>   CI Name:  <%= f.content.text_field :name %>
>>> <% end %>
>>
>> That doesn''t mean anything - you need
>> form_for :co, @ci.content, ... do |f|
>> f.text_field :name
>> end
>>
>> If the form as a whole should apply to ci rather than its content  
>> then
>> you can use fields_for to create the fields (without creating the
>> <form> tag)
>>
>> Fred
>
> Fred......will you be able to show me a sample code that tells how a
> record is to be edited when there exists a polymorphic relation as  
> shown
> in the starting thread of this talk
>
The polymorphism is (I think) irrelevant, it''s the fact that there is  
an association. There is a good series on railscasts.com about complex  
forms.

Fred
> Thanks
> Venu
> -- 
> Posted via http://www.ruby-forum.com/.
>
> >

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Frederick Cheung wrote:
> On 2 Jan 2008, at 15:34, Venu Vallayil wrote:
> 
>>> That doesn''t mean anything - you need
>>
>> Fred......will you be able to show me a sample code that tells how a
>> record is to be edited when there exists a polymorphic relation as  
>> shown
>> in the starting thread of this talk
>>
> The polymorphism is (I think) irrelevant, it''s the fact that there
is
> an association. There is a good series on railscasts.com about complex
> forms.
> 
> Fred

But nobody talks/shows the code about editing a record keeping the 
concept I introduced in my starting thread....seems to be i am lost 
somewhere....can''t proceed.....thanks for your support. Really 
appreciate your support.

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