title: Mongodb query (hashmap objects)
body: <p>I want to query all the UserGroup's ID where admins's ID="25160228446835585906563830293" or users's ID ="25160228446835585906563830293". </p>
  
  <p>this is a hashmap key and value pair in java obj <code>hashmap&lt;String,Date&gt;</code>
  <code>"25160228446835585906563830293" : ISODate("2013-03-26T04:51:36.731Z")</code></p>
  
  <pre><code>{ "_id" : ObjectId("51512958849ca4748271c640"), 
    "_class" : "com.pcd.app.model.UserGroup", 
    "groupName" : "sdfsadfsad", 
    "privacyType" : "PRIVACY_OPEN", 
    "approvalType" : "MEMBER_APPROVAL", 
    "groupDescription" : "test", 
    "admins" : { 
        "25160228446835585906563830293" : ISODate("2013-03-26T04:51:36.731Z"),
        "25160228446835585906563830294" : ISODate("2013-03-26T04:51:36.731Z"),
        "25160228446835585906563830295" : ISODate("2013-03-26T04:51:36.731Z") 
    },
    "users" : { 
        "25160228446835585906563830296" : ISODate("2013-03-26T04:51:36.731Z") 
    } 
  }
  </code></pre>