grouping.rb

# How to group this collection so that Clover::Order will be grouped by every 15 mins

{
  Sun, 09 Jul 2017 => [
    #<Clover::Order:0x007f82efc7a758
      @created_time=2017-07-10 00:15:00 +0800,
      @id="5CY4WQG1XWJK1",
      @state="paid",
      @total=1234>,
   #<Clover::Order:0x007f82efc6b550
      @created_time=2017-07-10 00:18:00 +0800,
      @id="5CY4WQG1XJK11",
      @state="paid",
      @total=1234>,
   #<Clover::Order:0x007f82efc61f28
      @created_time=2017-07-10 00:30:00 +0800,
      @id="5CY4WQG1XWJK2",
      @state="paid",
      @total=4567>,
   #<Clover::Order:0x007f82ef801f00
      @created_time=2017-07-10 00:45:00 +0800,
      @id="5CY4WQG1XWJK2",
      @state="paid",
      @total=8901>],
  Tue, 11 Jul 2017 => [
    #<Clover::Order:0x007f82efc53db0
      @created_time=2017-07-11 12:25:00 +0800,
      @id="5CY4WQG1XWJK1",
      @state="paid",
      @total=1234>,
   #<Clover::Order:0x007f82efc49d60
      @created_time=2017-07-11 12:30:00 +0800,
      @id="5CY4WQG1XWJK1",
      @state="paid",
      @total=1234>],
  Thu, 13 Jul 2017 => [
    #<Clover::Order:0x007f82efc3b8f0
    @created_time=2017-07-13 12:50:00 +0800,
    @id="5CY4WQG1XWJK1",
    @state="paid",
    @total=1234>
  ]
}

# End result

{
  Sun, 09 Jul 2017 => [
    [
      #<Clover::Order:0x007f82efc7a758
        @created_time=2017-07-10 00:15:00 +0800,
        @id="5CY4WQG1XWJK1",
        @state="paid",
        @total=1234>,
    ],
    [
      #<Clover::Order:0x007f82efc6b550
        @created_time=2017-07-10 00:18:00 +0800,
        @id="5CY4WQG1XJK11",
        @state="paid",
        @total=1234>,
      #<Clover::Order:0x007f82efc61f28
        @created_time=2017-07-10 00:30:00 +0800,
        @id="5CY4WQG1XWJK2",
        @state="paid",
        @total=4567>,
    ],
    [
      #<Clover::Order:0x007f82ef801f00
      @created_time=2017-07-10 00:45:00 +0800,
      @id="5CY4WQG1XWJK2",
      @state="paid",
      @total=8901>
    ]
  ],
  Tue, 11 Jul 2017 => [
    #<Clover::Order:0x007f82efc53db0
      @created_time=2017-07-11 12:25:00 +0800,
      @id="5CY4WQG1XWJK1",
      @state="paid",
      @total=1234>,
   #<Clover::Order:0x007f82efc49d60
      @created_time=2017-07-11 12:30:00 +0800,
      @id="5CY4WQG1XWJK1",
      @state="paid",
      @total=1234>
  ],
  Thu, 13 Jul 2017 => [
    #<Clover::Order:0x007f82efc3b8f0
    @created_time=2017-07-13 12:50:00 +0800,
    @id="5CY4WQG1XWJK1",
    @state="paid",
    @total=1234
  ]
}