ruby-on-rails - 使用 Ruby 按两个条件对哈希数组进行分组

Question

我有一个像这样的哈希数组，出于展示目的，我删除了一些记录。

[
  {
    "id"=>425343308605714432, 
    "text"=>"Hello", 
    "sender"=> {
      "id"=>1375480994, 
      "name"=>"Rocket"
    }, 
    "sender_id"=>1375480994, 
    "recipient"=> {
      "id"=>24766510,
      "name"=>"Max Rose-Collins"
    }, 
    "recipient_id"=>24766510, 
    "recipient_id_str"=>"24766510", 
    "recipient_screen_name"=>"maxrosecollins", 
    "created_at"=>"Mon Jan 20 19:05:21 +0000 2014" 
  },
  {
    "id"=>413305410666639361,  
    "text"=>"How are you", 
    "sender"=> {
      "id"=>24766510,  
      "name"=>"Max Rose-Collins"
    }, 
    "sender_id"=>24766510, 
    "sender_screen_name"=>"maxrosecollins", 
    "recipient"=> {
      "id"=>1375480994, 
      "name"=>"Rocket"
    }, 
    "recipient_id"=>1375480994, 
    "recipient_id_str"=>"1375480994", 
    "recipient_screen_name"=>"Rocket", 
    "created_at"=>"Wed Dec 18 13:51:03 +0000 2013"
  }
]

这个哈希数组还包含其他用户之间的其他消息。我想将其安排到包含两个用户之间发送和接收的消息的对话中。我试过使用

.group_by { |r| [r['recipient_id'], r['sender_id']] }

但这并没有按照我的想法对它们进行分组。它使两组一组被发送，另一组被接收。

{
  [1375480994, 24766510]=>[removed for presentation], 
  [24766510, 1375480994]=>[removed for presentation],
  [24766510, 146385359]=>[removed for presentation],
  [146385359, 24766510]=>[removed for presentation],
}

如何将这两个哈希值合并为一个，以便将整个对话集中在一个地方，就像线程对话一样？

Answer 1

为了按 session 对它们进行分组，您可以将 sort 方法添加到 group_by 函数中:

.group_by{ |r| r.values_at('recipient_id', 'sender_id').sort }