old_contents: from copy import deepcopy
  from django.contrib import admin
  from mezzanine.blog.admin import BlogPostAdmin
  
  from models import Episode
  
  episode_extra_fieldsets = [
      (None, {'fields': ('short_description', 'cover_image', 'episode_link', 'length')}),
  ]
  
  
  class EpisodeAdmin(BlogPostAdmin):
      fieldsets = deepcopy(BlogPostAdmin.fieldsets) + episode_extra_fieldsets
  
  
  admin.site.register(Episode, EpisodeAdmin)
  
new_contents: from copy import deepcopy
  from django.contrib import admin
  from mezzanine.blog.admin import BlogPostAdmin
  
  from models import Episode
  
  fields = ('short_description', 'cover_image', 'episode_link', 'length', 'cover_image_square')
  episode_extra_fieldsets = [(None, {'fields': fields})]
  
  
  class EpisodeAdmin(BlogPostAdmin):
      fieldsets = deepcopy(BlogPostAdmin.fieldsets) + episode_extra_fieldsets
  
  
  admin.site.register(Episode, EpisodeAdmin)
  
subject: Add square episode image to admin