Simple_form: Association in a nested form

[rrivas]

Is it possible to create an association within a simple_fields_for object?

<%= simple_form_for(@rooftop) do |f| %>
 <div class="inputs">
 <%= f.input :name %>  
 <%= f.simple_fields_for "address", @address do |a| %>  
  <%= a.input :street %>  
  <%= a.association :state, :include_blank => false %>  
  <%= a.input :zip %>  
 <% end %>  
 <div class="actions">  
 <%= f.submit %>  
 </div>  
<% end %>

[carlosantoniodasilva]

simple_fields_for works pretty much the same way fields_for, it just uses SimpleForm builder, so you're able to do wathever you'd do without SimpleForm =).

[rrivas]

This doesnt really answer my question. When going to this view I get an error
Association cannot be used in forms not associated with an object
My associations seem to be correct but creating an association will not return a valid object within the simple_form.

The models that I am using are rooftop
class Rooftop < ActiveRecord::Base
has_one :address

  validates_presence_of :name,  :on => :create, 
                                :message => "cant be blank"
end

and address

class Address < ActiveRecord::Base
  has_one :state
  attr_accessible :street, :city, :state_id, :zip 

  validates_presence_of :street,  :on => :create, 
                                :message => "cant be blank"
end

From here, address has an association to a state model

class State < ActiveRecord::Base
  belongs_to :country
  has_many :addresses

  attr_accessible :name, :country_id

  validates_presence_of :name,  :on => :create, 
                                :message => "cant be blank"

  validates_uniqueness_of :name,  :scope => :country_id,
                                  :message => "state for this country already exists"
end

[carlosantoniodasilva]

The error message says there is no object associated do simple_fields_for. Does your @address variable exist? In most cases, you just need to build that variable through the association and call it like this:
# Controller
@rooftop.build_address

# View
 <%= f.simple_fields_for :address do |a| %>  
    # a.input/association
 <% end %>

[rrivas]

I'm an idiot. I figured out the problem and you steered us in the right direction. Thanks a lot for your help :) and its a great plugin!

[carlosantoniodasilva]

Nice! Thanks =)

[fwolfst]

Just for the records, with rails 4 you also need to have the accepts_nested_attributes_for in place.

[tboyko]

@fwolfst That's accepts_nested_attributes_for (with an s after accept)

[fwolfst]

@tboyko Thanks. For future readers: Never mind, I corrected the relevant message already.