title: ARANGO DB relation between 2 collections
body: <p>I need to know how to get the master child relations in arangoDB.
  I have a following document collection called user given below</p>
  
  <pre><code>{
    "firstName": "dasdsa",
    "lastName": "Deshpande",
    "emailAddress": "Abc@GAURAV.CO.IN",
    "password": "aA@1234",
    "applicationId": [
      180031,
      180091
    ],
    "isActiveUser": "false",
    "isAdminUser": "false",
       }
  </code></pre>
  
  <p>and second document collection named application</p>
  
  <pre><code> {
    "id":"180031",
    "applicationName": "firstApp",
    "description": "first app description"
  }
  
   {
        "id":"180091
    ",
        "applicationName": "secondApp",
        "description": "first app description"
      }
  </code></pre>
  
  <p>I want to retrieve application name based  on the application id that is been tagged to the user. In this case I want to retrieve firstApp and secondApp.</p>