RoR Activerecord：通过共享一个模型的两个关联来加入查询

Question

I have a model called flightleg:

class FlightLeg < ActiveRecord::Base
      ....
      belongs_to :departure_airport, :class_name => "Airport"
      belongs_to :arrival_airport, :class_name => "Airport"
end

And I want to do a query on it like this:

Flight.joins(:airline, flight_legs: [:departure_airport, :arrival_airport]).where('departure_airport.icao_code = YBBN')

Of course, this doesn't work. Here is a gist of the error message:

https://gist.github.com/emilevictor/b1b7d18d5cede597c6be

I am trying to figure out how to get it all to work nicely, and be able to refer to fields of the departure and arrival airports in my query.

Answer 1

There's no table 'departure_airports', but in the gist we see

 INNER JOIN "airports" ON "airports"."id" = "flight_legs"."departure_airport_id"

so can you try ('airports.icao_code = YBBN') ?