title: Inserting new field in mongodb deletes other collection attributes
body: <p>When I insert a new field in my users collection, several of the attributes disappear. Initially, my collection looked like this:</p>
  
  <pre><code>{
  "_id": "myfi3E4YTf9z6tdgS",
  "createdAt": ISODate("2015-03-20T16:25:06.978Z"),
  "emails": {
      "address": "abc123@gmail.com",
      "verified": true
  },
  "profile": {
      "companyName": "Company1",
      "markup": "5",
      "phoneNum": "555-555-5555"
  },
  "services": {
      "password": {
          "bcrypt": "$2a$10$EsecJJz.PA/qgupHzknYBuGQRW4c6S9hFScc4GesOcO7pixOna1AG"
      },
      "resume": {
          "loginTokens": [
              {
                  "when": ISODate("2015-03-23T20:58:48.642Z"),
                  "hashedToken": "dlPlzU7KtVhMW1JPDgCQWPYgqIc825ao2bnR84q9NQI="
              }
          ]
      }
  },
  }
  </code></pre>
  
  <p>I then added an admin flag field by typing the following command in the terminal:</p>
  
  <pre><code>db.users.update({_id: 'myfi3E4YTf9z6tdgS'}, {$set: {profile{ admin: true}}
  </code></pre>
  
  <p>I checked the collection's attributes again and found:</p>
  
  <pre><code>{
  "_id": "myfi3E4YTf9z6tdgS",
  "createdAt": ISODate("2015-03-20T16:25:06.978Z"),
  "emails": {
      "address": "abc123@gmail.com",
      "verified": true
  },
  "profile": {
      "admin": true
  },
  "services": {
      "password": {
          "bcrypt": "$2a$10$EsecJJz.PA/qgupHzknYBuGQRW4c6S9hFScc4GesOcO7pixOna1AG"
      },
      "resume": {
          "loginTokens": [
              {
                  "when": ISODate("2015-03-23T20:58:48.642Z"),
                  "hashedToken": "dlPlzU7KtVhMW1JPDgCQWPYgqIc825ao2bnR84q9NQI="
              },
              {
                  "when": ISODate("2015-03-25T03:32:37.172Z"),
                  "hashedToken": "xrojAUw7VwQvbjMtDwaexFEtQprMgl85b+0SY18z58c="
              }
          ]
      }
  },
  }
  </code></pre>
  
  <p>The profile.companyName, profile.markup, and profile.phoneNum disappeared. Does anyone know what's going on? Please help!</p>