ruby-on-rails - Rails has_and_belongs_to_many 创建/插入不起作用

Question

我有以下型号 -

class Employee < ActiveRecord::Base
  has_and_belongs_to_many :surveys, join_table: 'employee_surveys'
end


class Survey < ActiveRecord::Base
  has_and_belongs_to_many :employees, join_table: 'employee_surveys'
end

当我这样做时Employee.first.surveys.create(name: "New Survey")，它会产生一个错误，抱怨employee_id是null??

Answer 1

我认为您想在这里使用员工类的实例，而不是类本身。

喜欢：

employee = Employee.first
employee.surveys.create(name: "New Survey")