这是我的模型: class User ActiveRecord::Base has_many :activities has_many :requestsclass Activity ActiveRecord::Base belongs_to :user belongs_to :object, :polymorphic = true 我希望获得所有用户活动并显示它们 Activity.
class User < ActiveRecord::Base has_many :activities has_many :requests class Activity < ActiveRecord::Base belongs_to :user belongs_to :object, :polymorphic => true
我希望获得所有用户活动并显示它们
Activity.where(:user_id => current_user.id).include(:object)
问题是我不能急于加载对象模型,因为它是多态的
我该如何克服这个问题?
Activity.find(:all, :include => :objectable, :conditions => {:user_id => current_user.id})
虽然您需要确保已在关联模型上正确定义了多态关系.
如需进一步帮助,请参阅:
http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html#label-Eager+loading+of+associations
多态部分位于“Eager loading of Associations”部分的末尾.