old_contents: from django.contrib import admin
  from django.contrib.admin.options import InlineModelAdmin
  from django.db import models
  
  from django_summernote.forms import AttachmentAdminForm
  from django_summernote.utils import get_attachment_model, using_config
  from django_summernote.widgets import SummernoteWidget, SummernoteInplaceWidget
  
  
  class SummernoteModelAdminMixin(object):
      summernote_fields = '__all__'
  
      @using_config
      def formfield_for_dbfield(self, db_field, *args, **kwargs):
          summernote_widget = SummernoteWidget if config['iframe'] else SummernoteInplaceWidget
  
          if self.summernote_fields == '__all__':
              if isinstance(db_field, models.TextField):
                  kwargs['widget'] = summernote_widget
          else:
              if db_field.name in self.summernote_fields:
                  kwargs['widget'] = summernote_widget
  
          return super(SummernoteModelAdminMixin, self).formfield_for_dbfield(db_field, *args, **kwargs)
  
  
  class SummernoteInlineModelAdmin(SummernoteModelAdminMixin, InlineModelAdmin):
      form = AttachmentAdminForm
  
  
  class SummernoteModelAdmin(SummernoteModelAdminMixin, admin.ModelAdmin):
      form = AttachmentAdminForm
  
  
  class AttachmentAdmin(admin.ModelAdmin):
      list_display = ['name', 'file', 'uploaded']
      search_fields = ['name']
      ordering = ('-id',)
      form = AttachmentAdminForm
  
  admin.site.register(get_attachment_model(), AttachmentAdmin)
  
new_contents: from django.contrib import admin
  from django.contrib.admin.options import InlineModelAdmin
  from django.db import models
  
  from django_summernote.forms import AttachmentAdminForm
  from django_summernote.utils import get_attachment_model, using_config
  from django_summernote.widgets import SummernoteWidget, SummernoteInplaceWidget
  
  
  class SummernoteModelAdminMixin(object):
      summernote_fields = '__all__'
  
      @using_config
      def formfield_for_dbfield(self, db_field, *args, **kwargs):
          summernote_widget = SummernoteWidget if config['iframe'] else SummernoteInplaceWidget
  
          if self.summernote_fields == '__all__':
              if isinstance(db_field, models.TextField):
                  kwargs['widget'] = summernote_widget
          else:
              if db_field.name in self.summernote_fields:
                  kwargs['widget'] = summernote_widget
  
          return super(SummernoteModelAdminMixin, self).formfield_for_dbfield(db_field, *args, **kwargs)
  
  
  class SummernoteInlineModelAdmin(SummernoteModelAdminMixin, InlineModelAdmin):
      pass
  
  
  class SummernoteModelAdmin(SummernoteModelAdminMixin, admin.ModelAdmin):
      pass
  
  
  class AttachmentAdmin(admin.ModelAdmin):
      list_display = ['name', 'file', 'uploaded']
      search_fields = ['name']
      ordering = ('-id',)
      form = AttachmentAdminForm
  
  admin.site.register(get_attachment_model(), AttachmentAdmin)
  
subject: Remove unintended form application from admin