title: Laravel datatable group data with same category
body: <p>I have a table item. the values inserted in the table are</p>
  
  <pre>
  category item
  -------- ----
  Mobiles  Lava
  Mobiles  Redmi
  Vehicles Honda
  Mobile   Oneplus
  </pre>
  
  <p>I want to show the above table as below in frontend using datatables. I have used <code>groupBy</code>, but it's not working.</p>
  
  <pre>
  Category      items
  --------      -------------------
  Mobiles       Lava, Oneplus, Redmi
  Vehicles      Honda
  </pre>
  
  <p>Anyone can you please help
  Thanks</p>