gistfile1.txt

# Mock columns for tables
list
  user_id integer

items:
  user_id integer
  list_id integer

users_items:
  user_id integer
  item_id integer

rating:
  item_id integer
  user_id integer



#model associations:

User
  has_many :items, :through => :users_items

Item
  belongs_to :user
  belongs_to :list
  has_many :users, :through => :users_items

List
  has_many :items
  belongs_to :user

UsersItems
  belongs_to :user
  belongs_to :list

Rating
  belongs_to :item
  belongs_to :user