Rails has_many through association

Question

A company has many locations (Location has company_id column). A location has many items and an item has many locations (join table).

company.rb

has_many :locations

location.rb

belongs_to :company
has_many :items, through: :item_locations
has_many :item_locations, :dependent => :destroy

item.rb

has_many :item_locations, :dependent => :destroy
has_many :locations, through: :item_locations

item_location.rb

belongs_to :item
belongs_to :location

Can I retrieve all items for a company, without adding company_id to Item?

Answer 1

Sure, just change your Company relationships to:

has_many :locations
has_many :item_locations, through: :locations
has_many :items, through: :item_locations

This should let you call company.items