Rails：引用一个表时创建两个导航属性

Posted 2021-05-06

我正在创建一个名为Routes的表，它只有destination_airport_id和arrival_airport_id。我希望能够引用@ route.destination_airport，但Rails不会创建这些属性。这是我试过的：

  create_table "routes", force: :cascade do |t|
    t.integer "departure_airport_id"
    t.integer "arrival_airport_id"
  end
  create_table "airports", force: :cascade do |t|
    t.string "iata_code"
    t.string "icao_code"
    t.string "international_name"
    t.string "localized_name"
  end
class Airport < ApplicationRecord
    scope :sorted, lambda { order("iata_code ASC") }
    has_many :routes, :foreign_key => :id
end
class Route < ApplicationRecord
    belongs_to :airport, :foreign_key => "arrival_airport_id"
    belongs_to :airport, :foreign_key => "departure_airport_id"
end

答案

试试这个：

class Route < ApplicationRecord
  belongs_to :arrival_airport, class_name: 'Airport'
  belongs_to :departure_airport, class_name: 'Airport'
end