Rails - Mar 2010 - noob question on associated records and their controller structure

Hi,

I have controllers for two models between which there exists a
belongs_to/has_one relationship.

How do I reference the parent model object in the child controller so
that I can later recover the child object in the parent controller,
i.e., create and "attach" the child to the parent model for later
recovery?

I would have guessed it was something like as follows:

class ChildController...

  def create
    @parent = ParentModel.find(params[:id]) # How to get "current"
parent from database?
    @parent.child = ChildModel.new(params[:child])
  ...

Any thoughts?

Grary

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Grary wrote:
> Hi,
> 
> I have controllers for two models between which there exists a
> belongs_to/has_one relationship.
> 
> How do I reference the parent model object in the child controller so
> that I can later recover the child object in the parent controller,
> i.e., create and "attach" the child to the parent model for later
> recovery?
If you have your associations set up properly, this is automatic.

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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Grary wrote:
> Hi,
> 
> I have controllers for two models between which there exists a
> belongs_to/has_one relationship.
> 
> How do I reference the parent model object in the child controller so
> that I can later recover the child object in the parent controller,
> i.e., create and "attach" the child to the parent model for later
> recovery?
> 
> I would have guessed it was something like as follows:
> 
> class ChildController...
> 
>   def create
>     @parent = ParentModel.find(params[:id]) # How to get
"current"
> parent from database?
Don''t bother finding the parent model if you already have the ID. 
That''s an extra query for no reason in most cases.
>     @parent.child = ChildModel.new(params[:child])
Oh, on second reading, I see what you''re asking.  Check out nested 
resources and accepts_nested_attributes_for.  Also read the Rails guide 
on associations if you haven''t already.
>   ...
> 
> Any thoughts?
Yes, try it before you ask! :)  Rails makes this simple.
> 
> Grary
Best,
--
Marnen Laibow-Koser
http://www.marnen.org
marnen-sbuyVjPbboAdnm+yROfE0A@public.gmane.org
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You should just be able to do child.parent

--
Jeremy Chase
http://twitter.com/jeremychase



On Tue, Mar 9, 2010 at 12:51 PM, Marnen Laibow-Koser
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>wrote:
> Grary wrote:
> > Hi,
> >
> > I have controllers for two models between which there exists a
> > belongs_to/has_one relationship.
> >
> > How do I reference the parent model object in the child controller so
> > that I can later recover the child object in the parent controller,
> > i.e., create and "attach" the child to the parent model for
later
> > recovery?
>
> If you have your associations set up properly, this is automatic.
>
> Best,
> --
> Marnen Laibow-Koser
> http://www.marnen.org
> marnen-sbuyVjPbboAdnm+yROfE0A@public.gmane.org
> --
> Posted via http://www.ruby-forum.com/.
>
> --
> You received this message because you are subscribed to the Google Groups
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>
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> .
> For more options, visit this group at
> http://groups.google.com/group/rubyonrails-talk?hl=en.
>
>
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