按地图分组在Groovy [英] Group by Map in Groovy

问题描述

[
  programs:  [
    trip: [
      [
        description: "",
        tripName: "Niagra",
        scheduleProgramTime: "2000-01-01T00:00:00-05:00",
        country: "USA"
      ],
      [
        description: "",
        tripName: "Chennai",
        scheduleProgramTime : "2000-01-01T00:00:00-05:00",
        country: "India"
      ],
      [
        description: "",
        tripName: "Niagra",
        scheduleProgramTime: "2000-01-01T00:00:00-05:00",
        country: "USA"
      ]
    ],
    trip: [   // Editor note: this line is in error. a map cannot have two properties named "trip". In practice this compiles, but when run the SECOND "trip" wipes out the FIRST. -- @BalRog
      [
        description: "",
        tripName: "South Africa",
        scheduleProgramTime: "2000-01-01T00:00:00-05:00",
        country: "Africa"
      ],
      [
        description: "",
        tripName: "Chennai",
        scheduleProgramTime: "2000-01-01T00:00:00-05:00",
        country: "India"
      ]
    ]
  ]
]

这是我的地图，我想基于tripName（Niagra / Chennai /南非）groupBy。输出我需要是像

This is my Map and I am trying to groupBy based on the tripName(Niagra/Chennai/South Africa). Output I need is like

[
  "Niagra": [
    [
      description: "",
      tripName: "Niagra",
      scheduleProgramTime: "2000-01-01T00:00:00-05:00"
      country: "USA"
    ],
    [
      description: "",
      tripName: "Niagra",
      scheduleProgramTime: "2000-01-01T00:00:00-05:00"
      country: "USA"
    ]
  ],
  "Chennai": [
    [
      description: "",
      tripName: "Chennai",
      scheduleProgramTime: "2000-01-01T00:00:00-05:00"
      country: "India"
    ]
  ],
  "South Africa": [
    [
      description: "",
      tripName: "South Africa",
      scheduleProgramTime: "2000-01-01T00:00:00-05:00"
      country: "Africa"
    ]
  ]
]

这个 cityMap.trip.groupBy（{it.tripName}）但没有得到正确的输出。
提前感谢。

I tried using this cityMap.trip.groupBy({it.tripName}) but not getting the proper output. Thanks in advance.

我已将它更改为Map。现在以前我已经给了大括号，而不是[]大括号。现在根据地图，你可以提供我的详细信息。

I have changed it to Map. Now previously I have given curly braces instead of "[]" braces.Now based on the Map can you please provide me the details.

推荐答案

首先，从一个正确的Groovy Map 开始。您的示例不是Groovy Map ，但它看起来像JSON。如果是，您可以使用 JsonSlurper 进行解析获得地图 -like。 然后可以在旅行对象上使用 groupBy（）：

First, start with a proper Groovy Map. Your example is not a Groovy Map, however it does look like JSON. If so, you can parse it with JsonSlurper to get something Map-like. Then you can use groupBy() on the trip object:

def json = new JsonSlurper().parseText("""{
  "trip": [
    {
      "description": "",
      "tripName": "Niagra",
      "scheduleProgramTime": "2000-01-01T00:00:00-05:00",
      "country" : "USA"
    },
    {
      "description": "",
      "tripName": "Chennai",
      "scheduleProgramTime": "2000-01-01T00:00:00-05:00",
      "country" : "India"
    },
    {
      "description": "",
      "tripName": "Niagra",
      "scheduleProgramTime": "2000-01-01T00:00:00-05:00",
      "country" : "USA"
    }
    ]
}
""")

json.trip.groupBy { it.tripName }

输出如下所示：

[
    'Niagra': [
        ['country':'USA', 'description':'', 'scheduleProgramTime':'2000-01-01T00:00:00-05:00', 'tripName':'Niagra'], 
        ['country':'USA', 'description':'', 'scheduleProgramTime':'2000-01-01T00:00:00-05:00', 'tripName':'Niagra']
     ], 


    'Chennai':[
        ['country':'India', 'description':'', 'scheduleProgramTime':'2000-01-01T00:00:00-05:00', 'tripName':'Chennai']
    ],
]

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