old_contents: """EntryAdmin for zinnia-ckeditor"""
  from django import forms
  from django.contrib import admin
  
  from ckeditor.widgets import CKEditorWidget
  
  from zinnia.models import Entry
  from zinnia.admin.entry import EntryAdmin
  from zinnia.admin.forms import EntryAdminForm
  
  
  class EntryAdminCKEditorForm(EntryAdminForm):
      """
      Define the CKEditor widget for the content field.
      """
      content = forms.CharField(widget=CKEditorWidget())
  
  
  class EntryAdminCKEditorMixin(object):
      """
      Mixin adding CKEditor for editing Entry.content field.
      """
      form = EntryAdminCKEditorForm
  
  
  class EntryAdminCKEditor(EntryAdminCKEditorMixin,
                           EntryAdmin):
      """
      Enrich the default EntryAdmin with CKEditor.
      """
      pass
  
  admin.site.unregister(Entry)
  admin.site.register(Entry, EntryAdminCKEditor)
  
new_contents: """EntryAdmin for zinnia-ckeditor"""
  from django import forms
  from django.contrib import admin
  from django.utils.translation import ugettext_lazy as _
  
  from ckeditor.widgets import CKEditorWidget
  
  from zinnia.models import Entry
  from zinnia.admin.entry import EntryAdmin
  from zinnia.admin.forms import EntryAdminForm
  
  
  class EntryAdminCKEditorForm(EntryAdminForm):
      """
      Define the CKEditor widget for the content field.
      """
      content = forms.CharField(
          label=_('Content'), required=False,
          widget=CKEditorWidget(config_name='zinnia_content'))
  
  
  class EntryAdminCKEditorMixin(object):
      """
      Mixin adding CKEditor for editing Entry.content field.
      """
      form = EntryAdminCKEditorForm
  
  
  class EntryAdminCKEditor(EntryAdminCKEditorMixin,
                           EntryAdmin):
      """
      Enrich the default EntryAdmin with CKEditor.
      """
      pass
  
  admin.site.unregister(Entry)
  admin.site.register(Entry, EntryAdminCKEditor)
  
subject: Configure the field correctly