title: insert in subdocument with mongoDB
body: <p>I have the following document in the collection:</p>
  
  <pre><code>"_id" : "2",
  "workspace" : [{
          "name" : "1",
          "widgets" : [ ]
      },{
          "name" : "2",
          "widgets" : [ ]
      },{
          "name" : "3",
          "widgets" : [ ]
      },{
          "name" : "4",
          "widgets" : [ ]
      }
  ]}
  </code></pre>
  
  <p>How can I insert <code>{id: "1", blabla: "blabla"}</code> in "widgets" for the "name" 3?</p>