伙计们,
想确保我理解正确.请忽略继承的情况(SentientBeing),尝试着重于has_many中的多态模型:通过关系.也就是说,考虑以下......
class Widget < ActiveRecord::Base
has_many :widget_groupings
has_many :people, :through => :widget_groupings, :source => :person, :conditions => "widget_groupings.grouper_type = 'Person'"
has_many :aliens, :through => :widget_groupings, :source => :alien, :conditions => "video_groupings.grouper_type = 'Alien'"
end
class Person < ActiveRecord::Base
has_many :widget_groupings, :as => grouper
has_many :widgets, :through => :widget_groupings
end
class Alien < ActiveRecord::Base
has_many :widget_groupings, :as => grouper
has_many :widgets, :through => :widget_groupings
end
class WidgetGrouping < ActiveRecord::Base
belongs_to :widget
belongs_to :grouper, :polymorphic => true
end
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在一个完美的世界里,我想,给一个Widget和一个人,做一些像:
widget.people << …Run Code Online (Sandbox Code Playgroud)