huginn: Why Liquid can't get a field including more than two objects on huginn?

@dsander Hi dsander, it’s a new question I met recently. I’m still learning about JavaScript and then I’ll ask you for some help again on that sum issue😸. The following is output of my website agent and some page has url field or pic_list field and some has nothing else but content. For fetching the url field I set {{content-full | content-full.post_array.url}} in template and it didn’t work. But {{content-full | content-full.content}} and {{content-full | content-full.post_array}} could work. I looked up in Liquid and found some objects like blogs.myblog.articles and collections.frontpage.products. I don’t know why this can’t work on huginn and how to get the url field directly except regular expression. Thanks a lot!😁

`"content-full": {
  "content": "something",
  "post_array": [
    {
      "height": 724,
      "done": true,
      "width": 500,
      "type": "pic",
      "url": "http://ugc.qpic.cn/gbar_pic/sjNCraTC8A7zL7ibVEEFbEicE1ibMmppI8Rw2jicUptWepPZBAfzkFuicTw/"
    }`