title: Inserting custom key:value pair in JSON structure with custom order using jbuilder
body: <p>In show method for a controller i have @object setup with query  </p>
  
  <pre><code>@object = WorkOrder.find(params[:id])  
  </code></pre>
  
  <p>Now, the show.json.jbuilder template has code as:  </p>
  
  <pre><code>json.extract! @object, :id, :note, :status, :created_at
  json.store_name @object.store.display_name
  </code></pre>
  
  <p>and the o/p is,  </p>
  
  <pre><code>{
    "id": 31,
    "note": "work_order for store A",
    "status": "complete",
    "created_at": "2015-11-26T11:16:53.000Z",
    "store_name": "store name"
  }
  </code></pre>
  
  <p>Now, how to insert 'store_name' custom key in between 'status' and 'created_at' ?</p>