Rails - Jan 2010 - Regarding form_for and fields-for content variable

I am trying to understand what I am working with when I deal with
Rails forms_for and fields_for constructors.

Given  model has_many associations belongs_to dependency  and
          dependency has_many associations belongs_to model
>  @model = Model.find(:id)
and
>  forms_for @model do |f|
 what is ''f''?
>    f.fields_for :associations do |ff|
what is ''ff''?

How do I access dependencies on the named associations?

I have inspected these things and the volume of data that each
contains is such that I cannot post it here.  My difficulty is that I
cannot seem to get a handled

I will try to give an example:

forms_for @model do |f|

   f.fields-for :associations do |ff|

   ff.text-field :model_id
   ff.text_field :dependency_id:

   ff.dependency.some_attribute  # this display value simply does not
work.

   ff.collection_select(
                  :dependency_id, @dependencies, :id, :name,
                  { :prompt => ''Select a name'' },    
#options hash
                  { :class => :input_select,              #html hash
                    :id => :input_name,
                    :size => 1,
                    :title => I18n.t(''Enter a valid name''),
                    :value => ff.dependency_id }   # this does not
work either
                  )

Now, while I know that ff != dependency it does seem to me counter
intuitive that for each association of model I am unable to directly
address the dependency attributes from within the form constructor.

What is my fundamental misunderstanding with respect to forms_for and
fields_for and their treatment of DBMS rows?  How does one obtain a
dependent attribute for display purposes within a forms_for or
fields_for construct?

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On Jan 26, 9:20 am, byrnejb
<byrn...-fqAF1SpE7daWxEb2tNKyrg@public.gmane.org> wrote:
>
> Now, while I know that ff != dependency
This should be association rather than dependency.  What I am asking
is why, when ff acts in the place of a specific model.association, I
cannot reach model.association.dependency.attribute.

The problem domain requires that associations be created separately
from either the model or the dependency but must be associated to an
extant qualified row in each.

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James Byrne wrote:
> I am trying to understand what I am working with when I deal with
> Rails forms_for and fields_for constructors.
> 
> Given  model has_many associations belongs_to dependency  and
>           dependency has_many associations belongs_to model
> 
>>  @model = Model.find(:id)
> 
> and
> 
>>  forms_for @model do |f|
> 
>  what is ''f''?
A FormBuilder.  The documentation for form_for already tells you this.

Best,
--
Marnen Laibow-Koser
http://www.marnen.org
marnen-sbuyVjPbboAdnm+yROfE0A@public.gmane.org
-- 
Posted via http://www.ruby-forum.com/.

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The most general it is a block value.  For a from builder |f| is a
form object with association parameters that have attributes that
correspond to the object.  f.text_field :name,  :name is a db column
or an attribute of the class.

same as:
array.each do |val|
  puts val
end

On Jan 26, 11:42 am, Marnen Laibow-Koser
<li...-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>
wrote:
> James Byrne wrote:
> > I am trying to understand what I am working with when I deal with
> > Rails forms_for and fields_for constructors.
>
> > Given  model has_many associations belongs_to dependency  and
> >           dependency has_many associations belongs_to model
>
> >>  @model = Model.find(:id)
>
> > and
>
> >>  forms_for @model do |f|
>
> >  what is ''f''?
>
> A FormBuilder.  The documentation for form_for already tells you this.
>
> Best,
> --
> Marnen Laibow-Koserhttp://www.marnen.org
> mar...-sbuyVjPbboAdnm+yROfE0A@public.gmane.org
> --
> Posted viahttp://www.ruby-forum.com/.
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