如何在Rails 5中模拟“ has_many”关联的“ OR”条件？

Question

我想模拟has_many关联的OR条件，因此我不会丢失活动记录关联。 我知道可以使用scope或实例方法来实现，但是那样的话，我将失去关联。

class Game < ActiveRecord::Base
  belongs_to :home_team, :class_name => "Team"
  belongs_to :away_team, :class_name => "Team"
  has_many :sponsors
end
class Sponsor < ActiveReord::Base
  belongs_to :game
end
class Team < ActiveRecord::Base
  has_many :away_games, :class_name => "Game", :foreign_key => "away_team_id"
  has_many :home_games, :class_name => "Game", :foreign_key => "home_team_id"

  # what I want here like:
  # has_many :games, :foreign_key => [:home_team_id, :away_team_id] 
  # so I could achieve without losing association helper:
  # has_many :sponsors through: :games
end

Answer 1

您可以执行以下操作：

在这里，它将首先删除原始范围:team_id并改用away_team_id或home_team_id 。

has_many :games, ->(team){ unscope(where: :team_id)
          .where('away_team_id = :team_id OR home_team_id = :team_id', team_id: team.id) }

has_many :sponsors, through: :games