相关疑难解决方法(0)

尝试做一个简单的user.destroy但遇到以下错误:

错误:表"user"上的更新或删除违反了表"identities"上的外键约束"fk_rails_5373344100"DETAIL:Key(id)=(2)仍然从表"identity"中引用.

这是我对身份的迁移

class CreateIdentities < ActiveRecord::Migration
  def change
    create_table :identities do |t|
      t.references :user, index: true, foreign_key: true
      t.string :provider
      t.string :uid

      t.timestamps null: false
    end
  end
end

这是我的用户和身份模型:

class Identity < ActiveRecord::Base
  belongs_to :user

  validates_presence_of :uid, :provider
  validates_uniqueness_of :uid, :scope => :provider

  def self.find_for_oauth(auth)
    find_or_create_by(uid: auth.uid, provider: auth.provider)
  end
end

和用户:

class User < ActiveRecord::Base
  TEMP_EMAIL_PREFIX = 'ricky@writeit.com'
  TEMP_EMAIL_REGEX = /\ricky@writeit.com/

  # Include default devise modules. Others available are:
  # :lockable, :timeoutable
  devise :database_authenticatable, :registerable, :confirmable, …