Rails的has_and_belongs_to_many創建/插入不起作用

Question

我有以下型號 -

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 

當我做Employee.first.surveys.create(name: "New Survey")它會產生一個錯誤，抱怨employee_id是null？

Answer 1

我想你想在這裏使用員工類的實例，而不是類本身。

像：

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