title: MongoDB query with multiple conditions
body: <p>I have data with multiple documents :</p>
  
  <pre><code>{
   "_id" : ObjectId("57b68dbbc19c0bd86d62e486"),
   "empId" : "1"
   "type" : "WebUser",
   "city" : "Pune"
  }
  {
   "_id" : ObjectId("57b68dbbc19c0bd86d62e487"),
   "empId" : "2"
   "type" : "Admin",
   "city" : "Mumbai"
  }
  {
   "_id" : ObjectId("57b68dbbc19c0bd86d62e488"),
   "empId" : "3"
   "type" : "Admin",
   "city" : "Pune"
  }
  {
   "_id" : ObjectId("57b68dbbc19c0bd86d62e489"),
   "empId" : "4"
   "type" : "User",
   "city" : "Mumbai"
  }
  </code></pre>
  
  <p>I want to get data according to my multiple conditions :</p>
  
  <pre><code>condition 1:- {"type" : "WebUser", "city" : "Pune"}
  
  condition 2:- {"type" : "WebUser", "city" : "Pune"} &amp; {"type" : "User", "city" : "Mumbai"}
  </code></pre>
  
  <p>I want below result when run condition 1 :</p>
  
  <pre><code>    {
       "_id" : ObjectId("57b68dbbc19c0bd86d62e486"),
       "empId" : "1"
       "type" : "WebUser",
       "city" : "Pune"
      }
  </code></pre>
  
  <p>When I run second condition :</p>
  
  <pre><code>{
    "_id" : ObjectId("57b68dbbc19c0bd86d62e486"),
    "empId" : "1"
    "type" : "WebUser",
    "city" : "Pune"
  }
  {
    "_id" : ObjectId("57b68dbbc19c0bd86d62e489"),
    "empId" : "4"
    "type" : "User",
    "city" : "Mumbai"
  }
  </code></pre>
  
  <p>I want above result by one query,</p>
  
  <p>Currently I am using below aggregate query,</p>
  
  <pre><code> db.emp.aggregate([
       { $match: { '$and': [
           {"type" : "WebUser", "city" : "Pune"}, 
           {"type" : "User", "city" : "Mumbai"}
       ] } },
       { $group: { _id: 1, ids: { $push: "$empId" } } }
   ])
  </code></pre>
  
  <p>Above query work for first condition &amp; fails for other. Please help me.</p>