使用lodash .groupBy。如何对对象内部的对象进行分组

Question

我正在使用lodash的_.groupBy来得出以下数据：

{
   "Generic Drugs":[
                      {
                          itemDes: "Dulcolax",
                          itemGeneric: "Bisacodyl",
                          price: '10'
                      },
                      {
                          itemDes: "Celine",
                          itemGeneric: "Ascorbic Acid",
                          price: '10'
                      },
                          {
                          itemDes: "Vitamic C",
                          itemGeneric: "Ascorbic Acid",
                          price: '10'
                      }
                   ],
  "None-generic Drugs" : [
                           {
                             itemDes: "test 1",
                             itemGeneric: "",
                             price: '10'
                           },
                           {
                             itemDes: "test 2",
                             itemGeneric: "",
                             price: '10'
                           }                                 
                   ]
}

我想通过属性itemGeneric对通用药物对象中的对象进行分组，得到如下输出：

{
   "Generic Drugs":[
                      "Ascorbic Acid" : [  
                                          { itemDes: "Celine" }, 
                                          { itemDesc: "Vitamin C" }
                                        ],
                      "Bisacodyl" : [
                                       { itemDes: "Dolculax" } 
                                    ]
  "None-generic Drugs" : [
                           {
                             itemDes: "test 1",
                             itemGeneric: "",
                             price: '10'
                           },
                           {
                             itemDes: "test 2",
                             itemGeneric: "",
                             price: '10'
                           }                                 
                   ]
}

请谁来帮我解决这个问题。谢谢你的回答。:)

Answer 1

对分组后的数据使用_.mapValues()，并按“itemGeneric”对每个值进行分组：

_.mapValues(grouped, function(group, key) {
      return key === 'Generic Drugs' ? _.groupBy(group, 'itemGeneric') : group;
});

​

var grouped = {
  "Generic Drugs": [{
    itemDes: "Dulcolax",
    itemGeneric: "Bisacodyl",
    price: '10'
  }, {
    itemDes: "Celine",
    itemGeneric: "Ascorbic Acid",
    price: '10'
  }, {
    itemDes: "Vitamic C",
    itemGeneric: "Ascorbic Acid",
    price: '10'
  }],
  "None-generic Drugs": [{
    itemDes: "test 1",
    itemGeneric: "",
    price: '10'
  }, {
    itemDes: "test 2",
    itemGeneric: "",
    price: '10'
  }]
};

var result = _.mapValues(grouped, function(group, key) {
      return key === 'Generic Drugs' ? _.groupBy(group, 'itemGeneric') : group;
});

console.log(result);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.2/lodash.min.js"></script>

​

如果原始数据项如下所示：

  {
      type: "Generic Drugs",
      itemDes: "Dulcolax",
      itemGeneric: "Bisacodyl",
      price: '10'
  }

您可以执行以下操作：

_(originalData).groupBy('type').mapValues(grouped, function(group, key) {
    return key === 'Generic Drugs' ? _.groupBy(group, 'itemGeneric') : group;
});