[英]how to add records to has_many :through association in Ruby on rails
我有這些模特
class EventGroups < ActiveRecord::Base
has_many :festival_venues
has_many :venues, :through => :festival_venues
end
class Venue < ActiveRecord::Base
has_many :festival_venues
has_many :event_groups, :through => :festival_venues
end
class FestivalVenue < ActiveRecord::Base
belongs_to :event_group
belongs_to :venue
end
我怎樣才能做到這一點?
class EventGroup < ActiveRecord::Base
has_many :festival_venues, dependent: :destroy
has_many :venues, :through => :festival_venues, :dependent => :destroy
end
class Venue < ActiveRecord::Base
has_many :festival_venues
has_many :event_groups, :through => :festival_venues
end
class FestivalVenue < ActiveRecord::Base
belongs_to :event_group
belongs_to :venue
end
現在,如果將event_group
變量綁定到EventGroup
對象,則可以使用以下命令創建Venue
(及其FestivalVenue
):
venue = Venue.create(your_attributes)
event_group.venues << venue
在下面的代碼中,模型類名稱必須為單數。 將類名稱EventGroups
更改為EventGroup
。 現在它將像魅力一樣工作。
class EventGroup < ActiveRecord::Base
has_many :festival_venues, dependent: :destroy
has_many :venues, :through => :festival_venues, :dependent => :destroy
end
剩下的代碼很好。
class Venue < ActiveRecord::Base
has_many :festival_venues
has_many :event_groups, :through => :festival_venues
end
class FestivalVenue < ActiveRecord::Base
belongs_to :event_group
belongs_to :venue
end
希望它會有所幫助。 謝謝
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