Nested resources and controllers: I think I'm down the wrong path

Rails
1

Hi,

I’m new to nested resources. I’m surprised to find that to make my
code work I need to retrieve the parent model in my RESTful
controllers for my dependencies.

So, for example, let’s say A has_one B. In controller B I seem to need
to refer to parent A, for example:

@b = A.find(params[:a_id]).b

But this doesn’t seem right and this change has only seemed to become
necessary as I’ve lately been using nested routes and nested form_for
stuff.

Can anyone confirm that using nested routes should not, in fact,
require wholesale changes like the one above to dependency
controllers?

Thanks,

Grar

2

Grary S. wrote:

Hi,

I’m new to nested resources. I’m surprised to find that to make my
code work I need to retrieve the parent model in my RESTful
controllers for my dependencies.

So, for example, let’s say A has_one B. In controller B I seem to need
to refer to parent A, for example:

@b = A.find(params[:a_id]).b

But this doesn’t seem right

No, it doesn’t. You should always be able to do B.find(params[:b_id]) .
What happens when you try?

Best,

Marnen Laibow-Koser
http://www.marnen.org
[email protected]

3

Marnen,

Here is the expression of a representative model association in my
project:

Parent … has_one :dependent
Dependent … belongs_to :parent

Here is my complementing route:

map.resources :parents, :has_one => [:dependent, :dependent_2, …

Here is a change I’d lately made to a _form.html.erb partial in views/
children to make things (kind of) work:

<% form_for([:parent, @child], :url => { :action=>:create }) do |f| %>

Man, I’m vexed!

I feel like I need to understand how form_for must be adapted for use
with nested resources.

Grar

4

I can’t recreate the problem, somehow, let’s consider the question
dead until I can.

Thanks,

Grar

5

[Please quote when replying.]

Grary S. wrote:

Marnen,

Here is the expression of a representative model association in my
project:

Parent … has_one :dependent
Dependent … belongs_to :parent

Here is my complementing route:

map.resources :parents, :has_one => [:dependent, :dependent_2, …

Why the :dependent_2 ? That doesn’t match your associations above.

And do you really want has_one? It has legitimate uses, but n most
cases, you should combine the two models instead of using has_one .

Here is a change I’d lately made to a _form.html.erb partial in views/
children to make things (kind of) work:

<% form_for([:parent, @child], :url => { :action=>:create }) do |f| %>

Man, I’m vexed!

Perhaps if you were to answer the question I asked, I could help you
better.

Perhaps if you could say what you had already tried, and how it failed,
we could help you better.

But with the information you are providing, and your failure to answer
questions intended to gather additional information about the problem,
it is nearly impossible to help.

I feel like I need to understand how form_for must be adapted for use
with nested resources.

Grar

Best,

Marnen Laibow-Koser
http://www.marnen.org
[email protected]