ruby-on-rails – 在rails中创建一个表并添加外键约束

class CreateGuardianUsersTable < ActiveRecord::Migration
  def self.up
    create_table(:guardian_users) do |table|
      table.@R_801_6561@amps # I find them useful; ymMV
      table.Integer :guardian_id
      table.Integer :WARD_id,:null => false,:references => [:students,:id]
      table.String :email
      table.String :heahead_password
    end
  end

  def self.down
    drop_table :guardian_users
  end
end

在你的模型中：

class GuardianUser < ActiveRecord::Base
  belongs_to :student
end

class student < ActiveRecord::Base
  has_many guardian_users:,:foreign_key => 'WARD_id',:class_name => 'GuardianUser',:dependent => :destroy
end