title: Flutter GetX RxList assign issue
body: <p>Im trying to convert old code to new code syntax. I have a issue with RxList.</p>
  <p><a href="https://i.stack.imgur.com/aMxcB.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/aMxcB.png" alt="enter image description here" /></a></p>
  <p>So I change <strong>postModel.assign(postDetail);</strong></p>
  <p><a href="https://i.stack.imgur.com/oArku.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/oArku.png" alt="enter image description here" /></a></p>
  <p>But In my news_detail page How I can access to value?</p>
  <p><a href="https://i.stack.imgur.com/TwgDE.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/TwgDE.png" alt="enter image description here" /></a></p>