如何使用ActiveAdmin创建STI子类的对象 [英] How to create an object of a STI subclass using ActiveAdmin

问题描述

给出以下设置（当前不起作用）

Given the following setup(which is not working currently)

class Employee < ActiveRecord::Base
end

class Manager < Employee
end

ActiveAdmin.register Employee do
  form do |f|
    f.input :name
    f.input :joining_date
    f.input :salary
    f.input :type, as: select, collection: Employee.descendants.map(&:name)
  end
end

我想要一个适用于所有员工的新表格，并能够在表格中选择该员工的STI类型。
我能够看到预期的类型选择框，但是当我按下创建按钮时，出现以下错误：

I would like to have a single "new" form for all employees and be able to select the STI type of the employee in the form. I am able to see the select box for "type" as intended but when I hit the "Create" button, I get the following error:

ActiveModel::MassAssignmentSecurity::Error in Admin::EmployeesController#create

Can't mass-assign protected attributes: type

现在，我知道受保护的属性在Rails中的工作方式，并且我有一些变通办法，例如定义 Employee。 attribute_protected_by_default ，但这会降低安全性，而且太容易被黑客攻击。

Now, I am aware of the way protected attributes work in Rails and I have a couple of workarounds such as defining Employee.attributes_protected_by_default but that is lowering the security and too hack-y.

我希望能够使用ActiveAdmin中的某些功能来做到这一点，但我找不到一个。我不想创建自定义控制器动作，因为我展示的示例已高度简化和人为设计。

I want to be able to do this using some feature in ActiveAdmin but I can't find one. I do not want to have to create a custom controller action as the example I showed is highly simplified and contrived.

我希望由ActiveAdmin生成的控制器可以识别 type 并执行 Manager.create 而不是 Employee.create

I wish that somehow the controller generated by ActiveAdmin would identify type and do Manager.create instead of Employee.create

有人知道解决方法吗？

推荐答案

您可以自定义控制器你自己阅读有关自定义控制器的ActiveAdmin文档。这是一个简单的示例：

You can customize the controller yourself. Read ActiveAdmin Doc on Customizing Controllers. Here is a quick example:

controller do
  alias_method :create_user, :create
  def create
    # do what you need to here
    # then call create_user alias
    # which calls the original create
    create_user
    # or do the create yourself and don't
    # call create_user
  end
end

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