old_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  from django import forms
  from django.utils.translation import ugettext_lazy as _
  
  from .models import Channel
  
  
  class ChannelAdminForm(forms.ModelForm):
      layout = forms.ChoiceField(choices=(('default', _('Default')),))
  
      class Meta:
          model = Channel
  
new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  from django import forms
  from django.utils.translation import ugettext_lazy as _
  
  from .models import Channel
  
  
  class ChannelAdminForm(forms.ModelForm):
      layout = forms.ChoiceField(choices=(('default', _('Default')),))
  
      def __init__(self, *args, **kwargs):
          super(ChannelAdminForm, self).__init__(*args, **kwargs)
          instance = getattr(self, 'instance', None)
          if instance and instance.pk:
              self.fields['slug'].widget.attrs['readonly'] = True
  
      class Meta:
          model = Channel
  
subject: Set slug field readonly after channel create