如何使用活动模型为 date_select 下拉菜单定义虚拟属性 [英] How to define virtual attribute for date_select drop menu using active model

问题描述

我在我的应用程序中使用活动模型进行付款流程，但我无法为信用卡到期日期添加字段，因为它会引发如下错误未定义的方法`card_expiration_date(3i)='.

I am using active model for payment process in my application , but i am not able to add field for credit card expiration date, since it throws error as below undefined method `card_expiration_date(3i)='.

在我的模型中:

class CartServer

  include ActiveModel::Validation

  include ActiveModel::Conversion

  extend ActiveModel::Naming

  attr_accessor :card_expiration_date

在视图中:

f.date_select(
  :card_expiration_date,
  :add_month_numbers => false,
  :discard_day => true,
  :start_year => (Date.today.year-10),
  :end_year => (Date.today.year+10),
  :order=>[ :month,:year]
)

推荐答案

这样的事情将在 Rails 6 中工作:

Something like this will work in Rails 6:

class CartServer
  include ActiveModel::Model
  include ActiveModel::Attributes
  include ActiveRecord::AttributeAssignment

  attribute :card_expiration_date, :date
end

这里有两件事很重要:

• 使用 :date 类型声明 attribute.在 ActiveRecord 模型中，此类型信息来自数据库模式，但由于我们使用的是 ActiveModel，因此需要显式声明它.

• Declaring the attribute with type :date. In an ActiveRecord model this type information comes from the database schema, but since we're using ActiveModel we need to explicitly declare it.

包括 ActiveRecord::AttributeAssignment 以获得对多部分参数分配的支持.表单中的参数如下所示:

Including ActiveRecord::AttributeAssignment to get support for multi-part parameter assignment. The params from the form will look something like this:

{
  "card_expiration_date(1i)" => "2020",
  "card_expiration_date(2i)" => "12",
  "card_expiration_date(3i)" => "31",
}

我们从 ActiveModel::Model 获得的 ActiveModel::AttributeAssignment 模块不知道如何将其转换为日期，因此我们需要引入更多全功能的 ActiveRecord 版本.

The ActiveModel::AttributeAssignment module we get from ActiveModel::Model doesn't know how to convert this into a date, so we need to pull in the more fully featured ActiveRecord version instead.

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