title: fetch specific attribute from model in backbone.js
body: <p>i am fetching data using following code</p>
  
  <pre><code> _.each(cardIds, function(id){        
                     var mdc = new MdlCard({cardId: parseInt(id)});                                
                    mdc.fetch({data:{cardId: parseInt(id)}});
                     cards.reset(mdc); 
                 });
  </code></pre>
  
  <p>cardIds contains cardId for particular list. in my cardview </p>
  
  <pre><code>initialize: function(){           
             _.bindAll(this,'render');
             this.model.bind('change', this.render, this);
             this.model.bind('destroy', this.remove, this);
         },
         render: function() {              
             var res = {data: this.model.toJSON(),ccId: this.model.cid};           $(this.el).html(this.template(res));                                                      
  
             chkIds = this.model.get('checklists');
             return this;
         },
  </code></pre>
  
  <p>i am passing this card model to template. but it will fetch two object per one request
  first object contains default value which i am defining while creating card model and second from the db(which actually i want)</p>
  
  <p>but when i am writing this line <code>chkIds = this.model.get('checklists');</code> it will return nothing. pls help me to find problem in this code.</p>