title: PrimeNG autocomplete with object binding
body: <p>Currently with my autocomplete setup my input field shows "[object Object]" rather than the appropriate property of the selected suggestion.</p>
  
  <p>The suggestions themselves render ok, showing the groupName and groupDescription properties correctly, but after selection my input is just rendering the object rather than the 'groupName' field like I was hoping the [field] attribute would instruct.</p>
  
  <pre><code>        &lt;p-autoComplete [(ngModel)]="groupSearchText" [suggestions]="groupResults" (completeMethod)="search($event)" [field]="groupName"  [size]="30" [minLength]="3"&gt;
  
              &lt;template let-group pTemplate="item"&gt;
                  &lt;div class="ui-helper-clearfix" style="border-bottom:1px solid #D5D5D5"&gt;
                      &lt;div style="font-size:18px;margin:10px 10px 0 0"&gt;{{group.groupName}}&lt;/div&gt;
                      &lt;div style="font-size:10px;margin:10px 10px 0 0"&gt;{{group.groupDescription}}&lt;/div&gt;
                  &lt;/div&gt;
              &lt;/template&gt;
  
          &lt;/p-autoComplete&gt;
  </code></pre>