title: Mongodb querying for multiple parameters
body: <p>I've this collections</p>
  
  <pre><code>{
      "name" : "montalto",
      "users" : [
          {
              "username" : "ciccio",
              "email" : "aaaaaaaa",
              "password" : "aaaaaaaa",
              "money" : 0
          }
      ],
      "numers" : "8",
      "_id" : ObjectId("5040d3fded299bf03a000002")
  }
  </code></pre>
  
  <p>If I want to search for a collection with the name of <strong>montalto</strong> and a user named <strong>ciccio</strong> I'm using the following query:</p>
  
  <pre><code>db.coll.find({name:'montalto', users:{username:'ciccio'}}).count()
  </code></pre>
  
  <p>But it does not work. Where I went wrong?</p>