Rails 5 hasMany through is not filtering

Question

I am migrating from Rails 4 to Rails 5 and got into this problem. I have the hasMany through relationship to connect the Track and the RightHolder classes:

class RightHolder < ActiveRecord::Base
  has_many :right_holder_tracks, class_name: 'TrackRightHolder', dependent: :delete_all
  has_many :tracks, -> { uniq }, through: :right_holder_tracks
end

class TrackRightHolder < ActiveRecord::Base
  belongs_to :track
  belongs_to :right_holder
end

class Track < ActiveRecord::Base
  has_many :track_right_holders, dependent: :destroy
  has_many :right_holders, -> { uniq }, through: :track_right_holders
end

In Rails 4 this was working perfectly, but in Rails 5, when I try to get:

Track.first.right_holders
RightHolder.first.tracks

The Rails application does these queries:

select * from right_holders
select * from tracks

What am I doing wrong? Is this a bug?

score 3 · Accepted Answer · answered Jul 07 '19 at 18:19

3

In Rails 5, relation uniq was deprecated in favor of distinct : https://edgeguides.rubyonrails.org/5_0_release_notes.html#active-record-deprecations

Rails 5 hasMany through is not filtering

2 Answers2