title: Access StructBlock in a StreamField of a Page.get_children in Wagtail
body: <p>I try to render a StreamField of a child page in a Page. I don't manage to render the different StructField within the StreamField. Here is my code</p>
  
  <pre><code>class DefinitionPage(Page):
  
  body = StreamField([
      ('definition', blocks.StructBlock([
          ('heading', blocks.CharBlock(label='Titre')),
          ('paragraph', blocks.RichTextBlock(label='Paragraphe')),
      ]))
  ])
  
  content_panels = Page.content_panels + [
      StreamFieldPanel('body'),
  ]
  </code></pre>
  
  <p>my template. (DefinitionPage is a child of this page.)</p>
  
  <pre><code>{% for post in page.get_children %}
      &lt;h2&gt;&lt;a href="{% pageurl post %}"&gt;{{ post.title }}&lt;/a&gt;&lt;/h2&gt;
      {% for block in post.body %}
          {% include_block block %}
      {% endfor %}
  {% endfor %}
  </code></pre>
  
  <p>post.title is ok but it's like there is no block in post.body.
  I tried so many things and {% include_block block %} is certainly wrong. I also tried to add a custom template for the StructBlock without success.</p>
  
  <p>How can I do ? I am using Django 2.0 and wagtail 2.0 (I'm new to wagtail but I read the doc)
  Best regards</p>