我想在每个User中有两个对Caregivers表的引用，关系将是双向的has_many，问题是我的定义中一定有什么错误，因为当我在变量current_user中有一个User时，我在控制器中执行以下行：current_user .reported_caregivers << @ caregivers，current_user.保存，没有保存任何东西。
这些是模型：

class Caregiver < ApplicationRecord
   has_many :users, dependent: :nullify #first reference to User
   has_many :reporters, :class_name => 'User', dependent: :nullify #new reference
end

class User < ApplicationRecord
   has_many :caregivers, dependent: :nullify #first reference
   has_many :reported_caregivers, :class_name => 'Caregiver', dependent: :nullify #new reference
...

字符串
这些是

class AddReportersToCaregivers < ActiveRecord::Migration[7.0]
   def change
     add_reference :caregivers, :reporters, foreign_key: { to_table: :users}, default: []
   end
end

class AddReportedCaregiversToUsers < ActiveRecord::Migration[7.0]
   def change
     add_reference :users, :reported_caregivers, foreign_key: { to_table: :caregivers}, default: []
   end
end

型