old_contents: # -*- coding: utf-8 -*-
  from __future__ import unicode_literals
  
  from django import VERSION as DJANGO_VERSION
  from django.db import migrations
  
  
  def create_indepth_page(apps, schema_editor):
      Page = apps.get_model("wagtailcore", "Page")
      InDepthListPage = apps.get_model("articles", "InDepthListPage")
      home_page = Page.objects.get(slug="home")
      ContentType = apps.get_model("contenttypes", "ContentType")
      # indepth_list_page_content_type = ContentType.objects.get_for_model(InDepthListPage)
  
      indepth_list_page_content_type, created = ContentType.objects.get_or_create(
          model='indepthlistpage',
          app_label='articles',
          defaults={'name': 'indepthlistpage'} if DJANGO_VERSION < (1, 8) else {}
      )
      # Create features page
      indepth_page = InDepthListPage.objects.create(
          title="InDepth",
          slug='indepth',
          content_type=indepth_list_page_content_type,
          path='000100010002',
          depth=3,
          numchild=0,
          url_path='/home/indepth/',
      )
  
      home_page.numchild += 1
      home_page.save()
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ('articles', '0009_auto_20150619_2156'),
          ('contenttypes', '__latest__'),
          ('core', '__latest__'),
      ]
  
      operations = [
          migrations.RunPython(create_indepth_page),
      ]
  
new_contents: # -*- coding: utf-8 -*-
  from __future__ import unicode_literals
  
  from django import VERSION as DJANGO_VERSION
  from django.contrib.contenttypes.management import update_contenttypes
  from django.db import migrations
  
  
  def create_indepth_page(apps, schema_editor):
      update_contenttypes(apps.app_configs['articles'], interactive=False)
      Page = apps.get_model("wagtailcore", "Page")
      InDepthListPage = apps.get_model("articles", "InDepthListPage")
      home_page = Page.objects.get(slug="home")
      ContentType = apps.get_model("contenttypes", "ContentType")
      indepth_list_page_content_type = ContentType.objects.get_for_model(InDepthListPage)
  
      # Create features page
      indepth_page = InDepthListPage.objects.create(
          title="InDepth",
          slug='indepth',
          content_type=indepth_list_page_content_type,
          path='000100010002',
          depth=3,
          numchild=0,
          url_path='/home/indepth/',
      )
  
      home_page.numchild += 1
      home_page.save()
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ('articles', '0009_auto_20150619_2156'),
          ('contenttypes', '__latest__'),
          ('core', '__latest__'),
      ]
  
      operations = [
          migrations.RunPython(create_indepth_page),
      ]
  
subject: Update the contenttypes before trying to access them.