Question

我有下面的JSON数据集

[
  {
    "campaignId": 111,
    "campaignCategory": "Diabetes",
    "result": [
      {
        "campaignType": 1,
        "name": "tes1"
      },
      {
        "campaignType": 1,
        "name": "test22"
      },
      {
        "campaignType": 3,
        "name": "test33"
      }
    ]
  },
  {
    "campaignId": 222,
    "campaignCategory": "Orthopedic",
    "result": [
      {
        "campaignType": 1,
        "name": "Orthopedic"
      }
    ]
  },
  {
    "campaignId": 333,
    "campaignCategory": "Cardiology",
    "result": [
      {
        "campaignType": 3,
        "name": "Cardiology"
      },
      {
        "campaignType": 1,
        "name": "Cardiology 123"
      }
    ]
  }
]

我对过滤器感到厌倦，但是没有返回所需的数据。

_.filter(summary, function (data) {
 return (post, _.filter(data.result, {'campaignType': 3}));

应用过滤后，我想获得以下数据。

[{ campaignId: 111, campaignCategory: 'Diabetes', result: [{
  campaignType: 3, name: 'test33'
}] }, 
{ campaignId: 333, campaignCategory: 'Cardiology', result: [{
  campaignType: 3, name: 'Cardiology'
}] } ];

此处显示的所有节点都具有campaignType: 3。 Lodash或基于纯Java脚本的解决方案都可以使用。

Answer 1

您可以使用reduce查找具有.result为3的campaignType项的对象，如果找到，则将它们推入累加器数组：

const getOutput = () => {
  const output = arr.reduce((a, item) => {
    const foundResults = item.result.filter(({ campaignType }) => campaignType === 3);
    if (foundResults.length) {
      a.push({ ...item, result: foundResults });
    }
    return a;
  }, []);
  console.log(output);
};

const arr = [{
    campaignId: 111,
    campaignCategory: 'Diabetes',
    result: [{
      campaignType: 1,
      name: 'tes1'
    }, {
      campaignType: 1,
      name: 'test22'
    }, {
      campaignType: 3,
      name: 'test33'
    }]
  },
  {
    campaignId: 222,
    campaignCategory: 'Orthopedic',
    result: [{
      campaignType: 1,
      name: 'Orthopedic'
    }]
  },
  {
    campaignId: 333,
    campaignCategory: 'Cardiology',
    result: [{
        campaignType: 3,
        name: 'Cardiology'
      },
      {
        campaignType: 1,
        name: 'Cardiology 123'
      }
    ]
  }
];
getOutput();

Answer 2

您可以在香草javascript中将filter与some和map结合使用。

var data = [{ campaignId: 111, campaignCategory: 'Diabetes', result: [{
  campaignType: 1, name: 'tes1'
},{
  campaignType: 1, name: 'test22'
},{
  campaignType: 3, name: 'test33'
}] },
{  campaignId: 222, campaignCategory: 'Orthopedic', result: [{
  campaignType: 1, name: 'Orthopedic'
}] }, 
{ campaignId: 333, campaignCategory: 'Cardiology', result: [{
  campaignType: 3, name: 'Cardiology'
},
{
  campaignType: 1, name: 'Cardiology 123'
}]} ];


var res = data.filter(campaign => campaign.result.some(type => type.campaignType === 3));

res = res.map(campaign => {
        campaign.result = campaign.result.filter(type => type.campaignType ===3);
        return campaign;
      });


console.log(res);

Answer 3

您可以预先过滤内部result并在存在ayn过滤器元素的情况下获取外部对象。然后以新结果获取一个新对象。

var data = [{ campaignId: 111, campaignCategory: 'Diabetes', result: [{ campaignType: 1, name: 'tes1' }, { campaignType: 1, name: 'test22' }, { campaignType: 3, name: 'test33' }] }, { campaignId: 222, campaignCategory: 'Orthopedic', result: [{ campaignType: 1, name: 'Orthopedic' }] }, { campaignId: 333, campaignCategory: 'Cardiology', result: [{ campaignType: 3, name: 'Cardiology' }, { campaignType: 1, name: 'Cardiology 123' }] }],
    result = data.reduce((r, o) => {
        var result = o.result.filter(({ campaignType}) => campaignType === 1);
        if (result.length) r.push(Object.assign({}, o, { result }));
        return r;
    }, []);
    
console.log(result);

.as-console-wrapper { max-height: 100% !important; top: 0; }

Answer 4

在我看来，您可以使用简单的Array.reduce和Array.forEach来获得以下结果：

});

如何使用Lodash对JSON数据进行子级过滤

4 个答案: