Issue with Rails 3 array

In my Rails 3 app, every User's profile has an array that I want to add to. The items are unique, but are added to each Profile in one 开发者_运维技巧of two categories. What I'm having trouble with however is linking the profile_item to the item through their IDs.

profile.rb Model:

class Profile < ActiveRecord::Base
  belongs_to :user
  accepts_nested_attributes_for :user

  has_many :profile_todos
  has_many :todos, :through => :profile_todos

  def add_todo_inside_item(item)
    self.profile_todos.build :category => 'inside'
  end

  def add_todo_outside_item(item)
    self.profile_todos.build :category => 'outside'
  end
end

todo.rb Model:

class Todo < ActiveRecord::Base
  belongs_to :profile
end

profile_todo.rb Model:

class ProfileTodo < ActiveRecord::Base
  belongs_to :profile
  belongs_to :todo
end

Todo.new gives the following:

>> Todo.new
=> #<Todo id: nil, name: nil, created_at: nil, updated_at: nil>

ProfileTodo.new gives the following:

>> ProfileTodo.new
=> #<ProfileTodo id: nil, category: nil, profile_id: nil, created_at: nil, updated_at: nil>

I'm calling the profile_todos in my profiles using:

<div id="todosheader">
  <p><%= @profile.first_name %>&nbsp;has&nbsp;<%= pluralize(@profile.profile_todos.count, 'todo') %>.</p>
</div>
<div id="todo-list">
  <div class="todos_inside">
    <h4>Inside&nbsp;(<%= @profile.profile_todos(:category => "inside").count %>)</h4>
    <p><%= @profile.profile_todos(:category => "outside") %></p>
  </div>
  <div class="todos_outside">
    <h4>Outside&nbsp;(<%= @profile.profile_todos(:category => "outside").count %>)</h4>
    <p><%= @profile.profile_todos(:category => "outside") %></p>
  </div>
</div>

How can I add a todo to the profile where the Todo :name is added with a given :category to the Profile? Right now calling @profile.profile_todos returns an empty array.

Let's say I have a Todo of "Test", with an ID of "1". If I try to add that Todo to my profile_todos array using @profile.add_todo_inside_item("Test"), I can't seem to attach the "Test" Todo to my profile_todos(:category => "inside").

I'm not sure what you want to do here..

todos should be plural.. and you should save the parent..

class Profile < ActiveRecord::Base
    has_many :todos

    def new_inside_todo(params)  # takes a hash of all attributes, like new()
      params.merge!( {:category => "inside"} )
      self.todos.build( params )
      self.save(:validate => false)
    end

    def new_outside_todo(params)
      params.merge!( {:category => "outside"} )
      self.todos.build( params )
      self.save(:validate => false)
    end
end

class Todo < ActiveRecord::Base
   belongs_to :profile

   # has an attribute called category

   # if Todos belong to more than one class, make the relationship polymorphic
   #     belongs_to :parent , :polymorphic => true
end