Rails - Mar 2010 - How to process collection_select in controller?

Hello everyone,

I am currently somewhat stuck figuring out an elegant solution to my following 
problem:

Let''s say I have the following classes:

class Event < ActiveRecord::Base
  belongs_to :reg_template, :class_name => "EmailTemplate"
  [...]
end

class EmailTemplate < ActiveRecord::Base
  has_many :events
  [...]
end

And a view that contains:

<%= f.collection_select(:reg_template_id, EmailTemplate.all, :id, :name)
%>

What is the recommended way of processing this form field in an action 
controller?

Having a 1:1 relationship between Event and EmailTemplate means that Rails 
does not generate a reg_template_id and reg_template_id= method (as it would 
do for a 1:n relationship), so attempts to read or assign this field will fail 
with:
  unknown attribute: reg_template_id
when attempting to call
  Event.update_attributes

Using 
<%= f.collection_select(:reg_template, EmailTemplate.all, :id, :name) %>
instead also does not help much as it will fail with:
  EmailTemplate(#70070455907700) expected, got String(#70070510199800)

I guess I must be missing something terribly obvious as I think is is rather 
common to update a model instance with a reference to another object through a 
collection_select.

Thanks & kind regards,
Thilo

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On Mon, Mar 1, 2010 at 10:15 PM, Thilo-Alexander Ginkel
<thilo-6Cr7QIIRUuHQT0dZR+AlfA@public.gmane.org>
wrote:
> Hello everyone,
>
> I am currently somewhat stuck figuring out an elegant solution to my
following
> problem:
>
> Let''s say I have the following classes:
>
> class Event < ActiveRecord::Base
>  belongs_to :reg_template, :class_name => "EmailTemplate"
>  [...]
> end
>
> class EmailTemplate < ActiveRecord::Base
>  has_many :events
>  [...]
> end
>
> And a view that contains:
>
> <%= f.collection_select(:reg_template_id, EmailTemplate.all, :id, :name)
%>
>
> What is the recommended way of processing this form field in an action
> controller?
>
> Having a 1:1 relationship between Event and EmailTemplate means that Rails
> does not generate a reg_template_id and reg_template_id= method (as it
would
> do for a 1:n relationship), so attempts to read or assign this field will
fail
> with:
>  unknown attribute: reg_template_id
> when attempting to call
>  Event.update_attributes
>
> Using
> <%= f.collection_select(:reg_template, EmailTemplate.all, :id, :name)
%>
> instead also does not help much as it will fail with:
>  EmailTemplate(#70070455907700) expected, got String(#70070510199800)
>
> I guess I must be missing something terribly obvious as I think is is
rather
> common to update a model instance with a reference to another object
through a
> collection_select.
>
> Thanks & kind regards,
> Thilo
>
Hello Thilo,

In my opinion, there is nothing wrong with your piece of code. Are you
sure you have a reg_template_id column in your table ? Could you show
us the migration for the Event class ?

-- 
Gael Muller

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use this

<%= collection_select(:book, :subject_id,
                         @subjects, :id, :name) %>

some thing like this or


<h1>Edit Book Detail</h1>
<% form_tag :action => ''update'', :id => @book do
%>
<p><label for="book_title">Title</label>:
<%= text_field ''book'', ''title''
%></p>
<p><label for="book_price">Price</label>:
<%= text_field ''book'', ''price''
%></p>
<p><label for="book_subject">Subject</label>:
<%= collection_select(:book, :subject_id,
                         @subjects, :id, :name) %></p>
<p><label
for="book_description">Description</label><br/>
<%= text_area ''book'', ''description''
%></p>
<%= submit_tag "Save changes" %>
<% end %>
<%= link_to ''Back'', {:action => ''list''
} %>


its just an idea

<%= f.collection_select(:reg_
template_id, EmailTemplate.all, :id, :name) %>


On Tue, Mar 2, 2010 at 3:05 PM, Gael Muller
<hatake.contact-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>wrote:
> On Mon, Mar 1, 2010 at 10:15 PM, Thilo-Alexander Ginkel
> <thilo-6Cr7QIIRUuHQT0dZR+AlfA@public.gmane.org> wrote:
> > Hello everyone,
> >
> > I am currently somewhat stuck figuring out an elegant solution to my
> following
> > problem:
> >
> > Let''s say I have the following classes:
> >
> > class Event < ActiveRecord::Base
> >  belongs_to :reg_template, :class_name => "EmailTemplate"
> >  [...]
> > end
> >
> > class EmailTemplate < ActiveRecord::Base
> >  has_many :events
> >  [...]
> > end
> >
> > And a view that contains:
> >
> > <%= f.collection_select(:reg_template_id, EmailTemplate.all, :id,
:name)
> %>
> >
> > What is the recommended way of processing this form field in an action
> > controller?
> >
> > Having a 1:1 relationship between Event and EmailTemplate means that
> Rails
> > does not generate a reg_template_id and reg_template_id= method (as it
> would
> > do for a 1:n relationship), so attempts to read or assign this field
will
> fail
> > with:
> >  unknown attribute: reg_template_id
> > when attempting to call
> >  Event.update_attributes
> >
> > Using
> > <%= f.collection_select(:reg_template, EmailTemplate.all, :id,
:name) %>
> > instead also does not help much as it will fail with:
> >  EmailTemplate(#70070455907700) expected, got String(#70070510199800)
> >
> > I guess I must be missing something terribly obvious as I think is is
> rather
> > common to update a model instance with a reference to another object
> through a
> > collection_select.
> >
> > Thanks & kind regards,
> > Thilo
> >
>
> Hello Thilo,
>
> In my opinion, there is nothing wrong with your piece of code. Are you
> sure you have a reg_template_id column in your table ? Could you show
> us the migration for the Event class ?
>
> --
> Gael Muller
>
> --
> 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
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rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org<rubyonrails-talk%2Bunsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>
> .
> For more options, visit this group at
> http://groups.google.com/group/rubyonrails-talk?hl=en.
>
>

-- 
Thanks:
Rajeev sharma

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Hello Gael,

On Tuesday 02 March 2010 10:35:26 Gael Muller wrote:
> In my opinion, there is nothing wrong with your piece of code. Are you
> sure you have a reg_template_id column in your table ? Could you show
> us the migration for the Event class ?
sorry for the delayed response - some unexpected events got in my way...

Back to the topic: Well, I had manually added the column to the database table 
in addition to creating the corresponding migration and apparently missed that 
the column is supposed to be named reg_template_id and not just reg_template.

With the right column naming everything started working as expected.

Sorry for the confusion and thanks for your hint!

Thanks,
Thilo

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