title: VueJS: Updating a parent object won't be reflected on child
body: <p>I have a parent with an object data and I sent to the child part of it. I hope that when the parent is updated the child should be updated to.</p>
  
  <p><code>groupProps</code> is an object that every property has a <code>lines</code> array. In example: <code>groupProps[1].lines[3]</code> can exist.</p>
  
  <pre><code>&lt;nova-grup v-for="group in m.groups"
             :group="group"
             :groupProp="groupProps[group.id]"
  &gt;
  &lt;/nova-grup&gt;
  </code></pre>
  
  <p>The first time it's working fine. The problem is when groupProps is changed the child isn't. For example, when changing or adding a line to groupProps.lines.</p>
  
  <p>I have also noted that any computed variable based on the object isn't updating neither. Is this a limitation of vuejs? I'm using some lodash functions inside the computed variable</p>