Forum: Ruby on Rails Rails Nested Object Form *_attributes problem

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Damon R. (Guest)
on 2009-04-13 07:59
I'm using Rails 2.3.2, and trying to get a nested object form to work
properly. I've narrowed my problem to the issue that Rails is not
setting my nested form elements with the *_attributes required to
initiate the accepts_nested_attributes_for processing. So instead of
params being:

{"person"=>{"name_attributes"=>{"given_name"=>"Fred",
"family_name"=>"Flintstone"}}, ...}

I get:

{"person"=>{"name"=>{"given_name"=>"Fred",
"family_name"=>"Flintstone"}}, ...}

As a result, I get a TypeMismatch exception. I've followed the
documentation from Ryan Daigle. I've also followed the advice from this
blog and the complex-forms-example.

Using Firebug, I went through my form and adjusted the name attribute of
the input tags from name to name_attributes. This produced the params
with name_attributes, and the create worked fine.

I'm stuck as I cannot figure out why my form is not producing the
*_attributes form of the name.

Another thing I tried is I got the complex_form_example working in my
environment. I've gone through every inch of the controller, models and
views and compared it to my code. I cannot find what is different. I
know this is something small, and would appreciate any help!

Thanks!
Damon R. (Guest)
on 2009-04-13 22:51
My model code is:

class Person < Party
  has_one :name, :class_name => "PersonName"
  accepts_nested_attributes_for :name, :allow_destroy => true
end

class PersonName < ActiveRecord::Base
  belongs_to :person
end

My view code looks like this (I'm using HAML):

%h3 New customer
= error_messages_for :person, :person_name, :name, :country

- form_for :person, :url => collection_url, :html => {:class =>
'MainForm'} do |person_form|

  - @person.build_name unless @person.name
  - person_form.fields_for :name do |name_form|
    = name_form.label :given_name, "First Name:"
    = name_form.text_field :given_name

    = name_form.label :family_name, "Last Name:"
    = name_form.text_field :family_name

  = hidden_field_tag :inviter_id, params[:inviter_id]
  = hidden_field_tag :inviter_code, params[:inviter_code]
  %p= submit_tag "Create"

= link_to 'Back', collection_url
Andrew F. (Guest)
on 2009-04-14 02:07
(Received via mailing list)
On Apr 13, 7:51 pm, Damon R. <removed_email_address@domain.invalid>
wrote:
> My view code looks like this (I'm using HAML):
>
> %h3 New customer
> = error_messages_for :person, :person_name, :name, :country
>
> - form_for :person, :url => collection_url, :html => {:class =>
> 'MainForm'} do |person_form|
>
>   - @person.build_name unless @person.name
>   - person_form.fields_for :name do |name_form|

Hi Damon, this is quite an unusual error as the '_attributes' suffix
is hard coded to be appended when the record object responds to symbol
+ '_attributes=' (where symbol in this case is 'name'). I would check
to make sure that person_form.object is definitely the @person object.
Especially as it looks like you are setting @name in the controller
for the error_messages_for. In fact I think posting the controller
code would be quite useful if you're still stuck.

Best regards,
Andrew
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