rails 3 mass assignment error, simple yet unresolvable

Question

I have been trying to figure out why I keep receiving mass-assignment errors when my code seems to be correct. Am I using the wrong syntax? I would really appreciate any beta, I have been trying to debug such a simple part of my application and its really halting my progress. I have the following:

controller

class ProductsController < ApplicationController
def new
        @product =Product.new
end

def create
        @product = Product.new(params[:product])
end

end

models

class Product < ActiveRecord::Base
  attr_accessible :name, :colors_attributes
  has_many :colors
  accepts_nested_attributes_for :colors, allow_destroy: true
end

class Color < ActiveRecord::Base
        attr_accessible :name, :product_id
        belongs_to :product
end

Migrations

class CreateProducts < ActiveRecord::Migration
  def change
    create_table :products do |t|
      t.string :name

      t.timestamps
    end
  end
end

class CreateColors < ActiveRecord::Migration
  def change
    create_table :colors do |t|
      t.integer :product_id
      t.string :name

      t.timestamps
    end
  end
end

Views

products/new.html.erb

 <%= render "form" %>

products/_form.html.erb

<%= form_for @product do |f| %>
        <%= f.text_field :name %>
        <%= f.fields_for :color do |c| %>
                <%= render 'color_fields', f: c %>
        <% end %>
        <%= f.button :submit %>
<% end %>

products/_color_fields.html.erb

<%= f.text_field :name %>

Error:

ActiveModel::MassAssignmentSecurity::Error in ProductsController#create

Can't mass-assign protected attributes: color

Full trace:

activemodel (3.2.3) lib/active_model/mass_assignment_security/sanitizer.rb:48:in `process_removed_attributes'
activemodel (3.2.3) lib/active_model/mass_assignment_security/sanitizer.rb:20:in `debug_protected_attribute_removal'
activemodel (3.2.3) lib/active_model/mass_assignment_security/sanitizer.rb:12:in `sanitize'
activemodel (3.2.3) lib/active_model/mass_assignment_security.rb:230:in `sanitize_for_mass_assignment'
activerecord (3.2.3) lib/active_record/attribute_assignment.rb:75:in `assign_attributes'
activerecord (3.2.3) lib/active_record/base.rb:498:in `initialize'
app/controllers/products_controller.rb:7:in `new'
app/controllers/products_controller.rb:7:in `create'
actionpack (3.2.3) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
actionpack (3.2.3) lib/abstract_controller/base.rb:167:in `process_action'
...

any insight would be appreciated

Answer 1

I believe this is what you want

<%= form_for @product do |f| %>
  <%= f.text_field :name %>
  <%= f.fields_for :colors do |c| %>
    <%= render 'color_fields', f: c %>
  <% end %>
  <%= f.button :submit %>
<% end %>

Your fields_for was using :color instead of :colors