对多态关联进行排序的最佳方法
因此 - 进行以下设置：
class Event < ActiveRecord::Base
has_many :invitations
end
class Invitation < ActiveRecord::Base
belongs_to :guest, :polymorphic => true
belongs_to :event
end
class Member > ActiveRecord::Base
has_many :invitations, :as => :guest
def full_name
[first_name, last_name].join(" ")
end
end
class Visitor > ActiveRecord::Base
has_many :invitations, :as => :guest
def full_name
name
end
end
最后，我希望能够获取按客人全名订购的活动邀请。我不知道怎么办 - 谁能帮我解决这个问题？将不胜感激:)
So - having the following setup:
class Event < ActiveRecord::Base
has_many :invitations
end
class Invitation < ActiveRecord::Base
belongs_to :guest, :polymorphic => true
belongs_to :event
end
class Member > ActiveRecord::Base
has_many :invitations, :as => :guest
def full_name
[first_name, last_name].join(" ")
end
end
class Visitor > ActiveRecord::Base
has_many :invitations, :as => :guest
def full_name
name
end
end
In the end, I want to be able to fetch an Events invitations ordered by the Guests full_name. I can't figure out how - anyone who can help me solve this? Would be greatly appreciated :)
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至于
full_name是一个虚拟属性，我只能想象 ruby 解决方案，而不是 sqlAs far as
full_nameis a virtual attributes I can imagine only ruby solution, not sql