title: Append to array nodejs mongodb
body: <p>I am trying to append a string to an array that will be used to identify a user in multiple chatrooms. I have tried and can not get this to work. The log does not put out anything but:</p>
  
  <p>[]</p>
  
  <pre><code>            if (req.body.method == "setid") {
              if(req.locals.user.chatid == null){
                  req.locals.user.chatid = {};
              }
  
              app.model.User.update(
                 { _id: req.locals.user._id },
                 { $addToSet: { chatid: [{mid: req.body.value}]}  } 
              );
          } else if (req.body.method == "checkid" &amp;&amp; req.body.value) {
              app.model.User.find({
                  "chatid": req.body.value
              }, function(err, FoundUser) {
                  if (err || !FoundUser) {
                      res.end("ERROR");
                  } else {
                      console.log(FoundUser);
                      res.end(FoundUser[0].displayName);
                  }
              });
          }
  </code></pre>
  
  <p>Mongo Structure</p>
  
  <pre><code>{
      email: { type: String, index: { unique: true }, required: true },
      password: { type: String },
      changeName: {type: Boolean},
      displayName: { type: String, index: { unique: true }, required: true },
      avatar: { type: String, default: '/assets/anon.png' },
      permissions: {
          chat: { type: Boolean, default: true },
          admin: { type: Boolean, default: false }
      },
      online: { type: Boolean, default: true },
      channel: { type: Types.ObjectId, ref: 'Channel', default: null }, //users channel
      banned: { type: Boolean, default: false },
      banend: {type:String, default: ''},
      subs: [{ type: Types.ObjectId, ref: 'User' }],
      about: { type: String },
      temporary: {type: Boolean, default: false},
      chatid:[{mid: {type:String}}]
  }
  </code></pre>