Include has_many through: relationship fails

With the following set of models:

class User < ActiveRecord::Base
    ...
    has_many :participations
    has_many :attempts, through: :participations
    has_many :completed_attempts, -> { completed }, through: :participations, source: :attempts
    ...
end

class Participation < ActiveRecord::Base
    ...
    belongs_to :user
    has_many :attempts
    ...
end

class Attempt < ActiveRecord::Base
    ...
    belongs_to :participation
    ...
end

the request GET /users/1?include=completed-attempts fails. completed-attempts.txt.

Likewise, GET /users/1?include=completed-attempts,attempts fails. completed-attempts_attempts.txt

However, as expected, GET /users/1?include=attempts works. attempts.txt

Changing the order, GET /users/1?include=attempts,completed-attempts, doesn't fail with a 500, however it returns the full list of Attempts for both the attempts and completed-attempts relationships. attempts_completed-attempts.txt

Querying the relations directly from the AR object works correctly for both attempts and completed_attempts.

Bắt đầu bằng cách tái hiện các request GET /users/1 được liệt kê với các định nghĩa model User, Participation và Attempt, đồng thời so sánh các response include với các truy vấn ActiveRecord trực tiếp. Điều tra cách xử lý các quan hệ has_many-through đã lọc và thứ tự của các include lồng nhau; được xem là hoàn thành khi completed-attempts chỉ trả về các Attempt đã hoàn thành và tất cả request được liệt kê đều tránh lỗi 500.