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.

Comienza reproduciendo las solicitudes GET /users/1 indicadas con las definiciones de los modelos User, Participation y Attempt, comparando las respuestas de include con consultas directas de ActiveRecord. Investiga el manejo de las relaciones has_many-through filtradas y el orden de los includes anidados; se considera terminado cuando completed-attempts devuelve únicamente los intentos completados y todas las solicitudes indicadas evitan un 500.