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Accepted
xaja
Asked:2020-07-30 06:51:05 +0000 UTC2020-07-30 06:51:05 +0000 UTC

lodash过滤多维数组

  • 772

我有一个多维数组：

var array = [
  {
    "day":"May 23 2019",
    "items": [
      {
        "Id":1,
        "Country":"NL",
        "User": 12345
      }, {
        "Id":2,
        "Country":"RU",
        "User": 67890
      }
    ]
  },
  {
    "day":"May 20 2019",
    "items": [
      {
        "Id":1,
        "Country":"NL",
        "User": 222222
      }, {
        "Id":2,
        "Country":"RU",
        "User": 333333
      }
    ]
  }
]

通过lodash我想过滤用户67890

_.filter(array, { items: [ { User: 67890  } ]});

它会将整个顶级对象返回给我

  {
    "day":"May 23 2019",
    "items": [
      {
        "Id":1,
        "Country":"NL",
        "User": 12345
      }, {
        "Id":2,
        "Country":"RU",
        "User": 67890
      }
    ]
  }

并且我希望它返回（也就是说，“额外”用户不会落入其中，因此最终数组包含具有所需 ID 的严格用户）

  {
    "day":"May 23 2019",
    "items": [ {
        "Id":2,
        "Country":"RU",
        "User": 67890
      }
    ]
  },
lodash

1 个回答

  1. Best Answer

    为了清楚起见，我对您的示例进行了一些调整：

    var _ = require('lodash'); 

var array = [
  {
    "day":"May 23 2019",
    "items": [
      {
        "Id":1,
        "Country":"NL",
        "User": 12345
      }, {
        "Id":2,
        "Country":"RU",
        "User": 67890
      }, {
        "Id":3,
        "Country":"US",
        "User": 67890
      }
    ]
  },
  {
    "day":"May 20 2019",
    "items": [
      {
        "Id":1,
        "Country":"NL",
        "User": 222222
      }, {
        "Id":2,
        "Country":"RU",
        "User": 333333
      }, {
        "Id":3,
        "Country":"US",
        "User": 67890
      }
    ]
  }
];

    很难在一行中做到这一点：

        const query = 67890;

    const magic = (array, query) => {
      const days = _.filter(array, { items: [ { User: query  } ]});
      return days.map(day => {
        const users = day.items.filter(el => el['User'] === query);
        return { day : day['day'], items : users };
      });
    };

    const result = magic(array, query);

    • 1

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