1
我有两个模型ObjectA和ObjectB。 ObjectB有两列,a_1_id和a_2_id,它们都是ObjectA的外键。 ObjectB属于这些外部ObjectA对象的每一个。如何设置一个模型属于另一个模型的两个实例的Rails关联?
class ObjectA < ActiveRecord::Base
attr_accessible :player_1, :player_2, :subject, :turn
belongs_to :player_1, :class_name => "User"
belongs_to :player_2, :class_name => "User"
has_many :object_b, dependent: :destroy, :finder_sql => "SELECT * FROM object_bs where (a_1_id = #{id} or a_2_id = #{id})"
end
class ObjectB < ActiveRecord::Base
attr_accessible :a_1_id, :a_2_id
belongs_to :a_1_id, :class_name => "ObjectA"
belongs_to :a_2_id, :class_name => "ObjectA"
end
这是设置关联的最佳方式吗?
我认为Rails的可确定通过简单地追加_id给定的名称。情况并非如此吗? – Quentamia
当您声明'belongs_to:player_1'时,它假定有一个Player1类并查找关键字'player1_id'。当你指定':class_name =>'User''时,它会查找关键字'user_id'。 – tybro0103
如果我添加外键,在尝试删除ObjectA实例时仍然收到以下错误:SQLite3 :: SQLException:no such column:object_bs.object_a_id:SELECT“object_bs”。* FROM“object_bs”WHERE“object_bs” 。“object_a_id”= 4 – Quentamia