如何使 has_many 关联变得独一无二？

发布于 2024-11-28 15:42:52 字数 386 浏览 1 评论 0原文

这是一个例子：

Class Store < ActiveRecord::Base
  has_many :employees
end

现在，当我像这样创建一个员工：

employee = Employee.new(attributes)

然后像这样创建两个商店：

store1 = Store.new(employees: [employee])
store2 = Store.new(employees: [employee])

它将员工上的 store_id 更改为商店 2，从而摆脱与 store1 的关联。如何确保一间商店只能分配一名员工？

原文

Here's an example:

Class Store < ActiveRecord::Base
  has_many :employees
end

Now when I create an employee like so:

employee = Employee.new(attributes)

and then two stores like so:

store1 = Store.new(employees: [employee])
store2 = Store.new(employees: [employee])

it changes the store_id on the employee to store 2, getting rid of the association with store1. How do I make sure that only one employee can be assigned to one store?

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孤芳又自赏 2024-12-05 15:42:52

尝试使用 .build 语法：

因此，在创建操作中（我假设这是来自员工新操作，并且商店已经创建。）执行如下操作：

#this is the id of whatever store... maybe its a nested resource so it would be something like
#@store = Store.find(params[:store_id])
@store = Store.find(id)
@employee = @store.employees.build(params[:employee])

还要确保您的员工中有一个 own_to模型。

Try using .build syntax:

So in the create action (I'm assuming this is coming from an employee new action, and that the stores have already been created.) do something like this:

#this is the id of whatever store... maybe its a nested resource so it would be something like
#@store = Store.find(params[:store_id])
@store = Store.find(id)
@employee = @store.employees.build(params[:employee])

Also be sure you have a belongs_to in your employees model.

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