Ruby on rails 使用包含的或从句

基于以下内容，我想根据一位艺术家和他们的艺术家信用查询相册。artist_credit association是多态的，可以属于发行版或曲目。这阻止了我做HMT。我可以通过在我的查询中执行包含操作从曲目端抓取相册，如下所示：

Album.includes(tracks: :artist_credits).where(artist_credits: { id: artist_id })

但我想做的是同时掌握曲目和发行版。我曾想过使用or子句，但出现以下错误：

ArgumentError (Relation passed to #or must be structurally compatible. Incompatible values: [:includes])

尝试此操作时：

Album.includes([tracks: :artist_credits, releases: :artist_credits]).where(artist_credits: { id: artist_id }).or(where(artist_credits: { id: artist_id }))

我怎样才能让它工作？有更好的方法吗

class Album < ApplicationRecord
  has_many :releases, dependent: :destroy
  has_many :tracks, dependent: :destroy

  has_many :album_artists, dependent: :destroy
  has_many :artists, through: :album_artists
end

class Track < ApplicationRecord
  has_many :artist_credits, as: :creditable, dependent: :destroy

  belongs_to :album
end

class Release < ApplicationRecord
  has_many :artist_credits, as: :creditable, dependent: :destroy

  belongs_to :album
end

class ArtistCredit < ApplicationRecord
  belongs_to :artist
  belongs_to :creditable, polymorphic: true # release or track
end

---

我建议如下

class Album < ApplicationRecord
   scope :accredited_artist, ->(artist_id) {
      includes([tracks: :artist_credits, releases: :artist_credits])
       .where(id: 
         where(
           id: Track.accredited_artist(artist_id).select(:album_id)
         ).or(
           where(
             id: Release.accredited_artist(artist_id).select(:album_id)
           )
         )
       )
   }
end

class Track < ApplicationRecord
   scope :accredited_artist, ->(artist_id) {
     joins(:artist_credits).where(artist_credits: { id: artist_id })
   }
end

class Release < ApplicationRecord
   scope :accredited_artist, ->(artist_id) {
     joins(:artist_credits).where(artist_credits: { id: artist_id })
   }
end

---

在这种情况下使用select会不会有点性能问题？@CarlEdwards不确定我是否理解这个问题。主要问题是您想使用includes和本机rails或condition。在where上下文中，我可能会混淆select。@ActiveRecord:：Relation上的Carlewards select正在指定SQL语句中要选择的列。这与Arrayselect不同，Arrayselect是迭代的，需要一个块。这回答了你的问题吗？是的。谢谢你的澄清。

SELECT 
  albums.* 
FROM 
  albums
WHERE 
  albums.id IN (
     SELECT 
        albums.id
     FROM 
        albums
     WHERE
        albums.id IN ( 
          SELECT 
             tracks.album_id
          FROM 
             tracks
             INNER JOIN artist_credits ON [whatever your join is here] 
          WHERE 
             artist_credits.artist_id = [ID]) OR 
         albums.id IN ( 
          SELECT 
             releases.album_id
          FROM 
             releases
             INNER JOIN artist_credits ON [whatever your join is here] 
          WHERE 
             artist_credits.artist_id = [ID])
  )