option_groups_from_collection_for_select特定方法组 [英] option_groups_from_collection_for_select specific method group

问题描述

我想在ActiveAdmin中创建一个动态选择表单。
假设一个用户有多个订单。每个订单都有一个属性pay（布尔值）。
选择用户后，下一个选择就是该用户的订单付款。

I want to make a dynamic select form into ActiveAdmin. Let say a User has multiple Orders. And each Order has an attribute pay (boolean). After selecting the User the next seleciton is the order pay by this user.

option_groups_from_collection_for_select(User.order(:email), :orders, :email, :id, :name)

但是我不明白如何只显示已支付的订单。

But i don't get how to display only the payed orders.

推荐答案

您可以在 User 模型，它将替换您传入的：orders 参数。此方法应返回 orders

You can define a method on the User model that will replace the :orders argument you're passing in. This method should return the orders that are payed.

尝试使用关联声明（这将为您添加方法）：

Try using an association declaration (this will add the method for you):

class User < ActiveRecord::Base
  has_many :orders
  has_many :paid_orders, class_name: 'Order', -> { where pay: true }
end

现在您的用户实例将具有 paid_orders 方法，该方法返回 orders 的 pay 属性为 true 。

Now your user instances will have a paid_orders method that returns orders where their pay attribute is true.

现在将表单助手更改为：

Now change your form helper to:

option_groups_from_collection_for_select(User.order(:email), :paid_orders, :email, :id, :name)

应该这样做。

这里的想法是：paid_orders 参数是 User 实例上方法的名称。您可以自由定义任何方法，甚至可以手动定义：

The idea here is that the :paid_orders argument is the name of a method on an instance of User. You are free to define any method you'd like, even manually as so:

class User < ActiveRecord::Base
  has_many :orders

  def paid_orders
    orders.where pay: true
  end
end

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