有三种模型用户表属性是name：string，age：integer，kind：integer。注册表属性为user_id：integer、tutor_id：integer、event_id：integer、favorite：boolean。事件表属性为name：string。这里的用户类型可以是student、tutor或tutor_student

# user.rb
    class User < ApplicationRecord
      enum kind: { student: 0, tutor: 1, tutor_student: 2 }
    
      has_many :registrations
      has_many :tutors, through: :registrations
      has_many :favorites, -> { where(registrations: { favorite: true }) }, through: :tutors, source: :event, class_name: 'Event'
    
    end
    
    # Event.rb
    class Event < ApplicationRecord
      has_many :registrations, foreign_key: :program_id
      has_many :users, through: :registrations
      has_many :tutors, through: :registrations
    end
    
    # registration.rb
    class Registration < ApplicationRecord
      belongs_to :user
      belongs_to :tutor, class_name: 'User'
      belongs_to :event
    end

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问题是
我试图通过有许多关系，如上面的虚拟数据样本，我给了用户事件最喜欢的导师

user.tutors.favorites

型
但我得到了这个错误

undefined method `favorites' for #<User::ActiveRecord_Associations_CollectionProxy:0x00007f04e8a7b540>

型
谁能帮我纠正一下我的联想。