Rails core - Dec 2009 - Simplest Nested form and ActiveRecord::AssociationTypeMismatch

Hi,

I''m struggling with the simplest nested form and I can''t
really find
any information about my problem after an hour of googling.

Here is the thing:

I have a contract model that belongs_to a kid model, I''m trying to
create a form for contract and create at the same time with nested
form, the kid.

so my "new" action does that

      @contract = Contract.new
      @contract.kid.build

my form is  (I''m using haml for the template):

- form_for :contract, @contract,:url => { :action => "create" },
:html
=> {:multipart => true} do |contract|
  - contract.fields_for :kid, @contract.kid do |kid|
    = kid.text_field :name

  = contract.text_field :start
  = contract.text_field :end

  = contract.submit "submit"

and at last my "create" action is:

@contract = Contract.new(params[:contract])

      if !@contract.save
        respond_to do |format|
          format.html { render :action => "new" }
        end
      else
        respond_to do |format|
          format.html { redirect_to(@kid) }
        end

The problem is that I get an ActiveRecord::AssociationTypeMismatch on
the line:
@contract = Contract.new(params[:contract])

that says that it was expecting a Kid model with a particular hash and
that instead it gets something with a different hash.

I can''t figure out what''s going on because if I try to create
a Kid
object on its own with params[:contract][:kid] it works, so I guess
the kid object from the form is a good one.

Any clue anyone ? I would like to try to do the things right and as
simple as possible without particular trick.

thanks

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> Any clue anyone ? I would like to try to do the things right and as
> simple as possible without particular trick.
This list is for questions about the development of ruby on rails, not
it''s use.  Please use the rubyonrails-talk list for questions like
this.

Having said that, looks like you''ve missed an
accepts_nested_attributes_for declaration.

-- 
Cheers

Koz

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