Cannot store additional attribute on stops_tours table with HABTM

[ehayon]

Activerecord won't let us store additional attributes on the join table for a has_and_belongs_to_many relationship.

We'll need to change this to a has_many :through relationship for rails to acknowledge the position attribute.

With our current schema:

  create_table "stops_tours", id: false, force: true do |t|
    t.integer  "tour_id"
    t.integer  "stop_id"
    t.datetime "created_at"
    t.datetime "updated_at"
    t.integer  "position"
  end

Rails has no idea that the position attribute even exists. Needs to be refactored into a has_many :through model...