django-simplecms/cms/admin.py

from django.contrib import admin
from django.utils.text import Truncator
from django.utils.safestring import mark_safe
from django.utils.translation import gettext_lazy as _
from .models import Config

class BasePageAdmin(admin.ModelAdmin):
    prepopulated_fields = {'slug': ('title',)}

class BaseSectionAdmin(admin.ModelAdmin):
    list_filter = [
        ('page', admin.RelatedOnlyFieldListFilter),
    ]
    list_display = ['__str__', 'get_type_display']

@admin.register(Config)
class ConfigAdmin(admin.ModelAdmin):
    list_display = ['__str__', 'get_content']
    exclude = ['parameter']

    def get_content(self, obj):
        return mark_safe(Truncator(obj.content).words(50, html=True))
    get_content.short_description = _('content')

    def has_add_permission(self, request):
        return False

    def has_delete_permission(self, *args, **kwargs):
        return False