Add contents to the content panels of the content block

server/book/models/contentblock.py

@@ -12,7 +12,7 @@ import logging
 from django.db import models
 
 from wagtail.admin.edit_handlers import FieldPanel, TabbedInterface, \
-    ObjectList
+    ObjectList, StreamFieldPanel
 from wagtail.core.fields import StreamField
 from wagtail.core.models import Page
 from wagtail.images.blocks import ImageChooserBlock
@@ -33,7 +33,7 @@ class ContentBlock(Page):
         ('student_entry', StudentEntryBlock(icon='download')),
         ('image', ImageChooserBlock(icon='image')),
         ('task', TextBlock(icon='tick'))
-    ])
+    ], null=True, blank=True)
 
     type = models.CharField(
         max_length=100,
@@ -47,6 +47,8 @@ class ContentBlock(Page):
 
     content_panels = [
         FieldPanel('title', classname="full title"),
+        FieldPanel('type'),
+        StreamFieldPanel('contents')
     ]
 
     settings_panels = [