title: Using lodash .groupBy. How to group object inside an object
body: <p>I'm using lodash's _.groupBy to come up with the following data:</p>
  
  <pre><code>{
     "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'
                             }                                 
                     ]
  }
  </code></pre>
  
  <p>I wanted to group the objects in Generic Drugs object by the property itemGeneric to come up an output like this: </p>
  
  <pre><code>{
     "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'
                             }                                 
                     ]
  }
  </code></pre>
  
  <p>Please somebody help me with this problem. Thanks for the answers. :)</p>