Rails 将活动记录结果拆分为数组/散列答案

【问题标题】：Rails splitting active record result into arrays/hashesRails 将活动记录结果拆分为数组/散列
【发布时间】：2016-11-23 10:26:15
【问题描述】：

假设我有一个这样的 Activerecord 结果：

order.order_numbers

返回ActiveRecord_Associations_CollectionProxy

=> [#<OrderNumber id: 53425, Order_number: "01100", Order_number_id: 5391, Order_number_status_id: 1, comment: nil, updated_at: "2016-11-18 16:20:36">,
 #<OrderNumber id: 53426, Order_number: "04503", Order_number_id: 5391, Order_number_status_id: 1, comment: nil,  updated_at: "2016-11-18 16:19:49">,
 #<OrderNumber id: 53427, Order_number: "011004", Order_number_id: 5391, Order_number_status_id: 2, comment: nil, updated_at: "2016-11-18 16:19:49">,
 #<OrderNumber id: 53428, Order_number: "004505", Order_number_id: 5391, Order_number_status_id: 1, comment: nil, updated_at: "2016-11-18 16:19:49">,
 #<OrderNumber id: 53429, Order_number: "4506", Order_number_id: 5391, Order_number_status_id: 2, comment: nil,  updated_at: "2016-11-18 16:19:49">,
 #<OrderNumber id: 53430, Order_number: "4507", Order_number_id: 5391, Order_number_status_id: 1, comment: nil, updated_at: "2016-11-18 16:19:49">]

注意Order_number_status_id，其中1 表示打开，2 表示关闭。

如果我想根据“关闭”状态将其拆分并将结果输出到单独的数组中，该怎么做？我只想将未结订单放入自己的数组中，但每次从封闭数字移动到开放数字时都会启动一个新数组。

在上面的例子中，结果是

Array_1 将包含 id 53425 和 53426
Array_2 将包含 id53428
Array_3 将包含 id 53430

因此它会将其拆分为 3 个不同的散列或数组，这些散列或数组仅包含未结订单号，它们都将位于一个数组中。

[[#<OrderNumber id: 53425, Order_number: "01100", Order_number_id: 5391, Order_number_status_id: 1, comment: nil, updated_at: "2016-11-18 16:20:36">,
 #<OrderNumber id: 53426, Order_number: "04503", Order_number_id: 5391, Order_number_status_id: 1, comment: nil,  updated_at: "2016-11-18 16:19:49">,], [<OrderNumber id: 53428, Order_number: "004505", Order_number_id: 5391, Order_number_status_id: 1, comment: nil, updated_at: "2016-11-18 16:19:49">], [<OrderNumber id: 53430, Order_number: "4507", Order_number_id: 5391, Order_number_status_id: 1, comment: nil, updated_at: "2016-11-18 16:19:49">]]

我愿意接受有关输出格式的建议。

【问题讨论】：

标签： ruby-on-rails arrays

【解决方案1】：

为什么不只是 .split？ Array#Split

order.order_numbers.split{|o| o.Order_number_status_id == 0}

【讨论】：

【解决方案2】：

您可以使用group_by

最适合你的情况

【讨论】：

【解决方案3】：

看看标准方法Enumerable#chunk。

你可以这样做：

order.order_numbers.chunk { |o_num| o_num.Order_number_status_id == 1 }.each{|a, b| p b}

将结果保存在新数组中以删除不必要的部分。

【讨论】：