Ruby on rails 如何模拟Rails 5中“has_many”关联的“或”条件?
我想模拟Ruby on rails 如何模拟Rails 5中“has_many”关联的“或”条件?,ruby-on-rails,rails-activerecord,ruby-on-rails-5,Ruby On Rails,Rails Activerecord,Ruby On Rails 5,我想模拟或条件,使有许多关联,这样我就不会丢失活动记录关联。我知道这可以通过使用范围或实例方法来实现,但在这种情况下,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 < Activ
或
条件,使有许多关联,这样我就不会丢失活动记录关联。我知道这可以通过使用范围
或实例方法来实现,但在这种情况下,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
类游戏“团队”
属于:客场球队:class\u name=>“球队”
有很多赞助商吗
结束
类发起人“Game”;:foreign\u key=>“客场球队id”
有很多:主场比赛,:class\u name=>“Game”;:foreign\u key=>“主场比赛”
#我想要的是:
#有很多:比赛,:外键=>[:主队id,:客队id]
#因此,我可以在不失去关联助手的情况下实现:
#奥运会有很多赞助商吗
结束
您可以执行以下操作:
在这里,它将首先删除原始范围:团队id
,并使用客场团队id
或主场团队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