django modeladmin 设置只读

   class (admin.ModelAdmin):
"""ModelAdmin class that prevents modifications through the admin.

   The changelist and the detail view work, but a 403 is returned
   if one actually tries to edit an object.
   """

   actions = None

   def get_readonly_fields(self, request, obj=None):
       return self.fields or [f.name for f in self.model._meta.fields]

   def has_add_permission(self, request):
       return False

   
   def has_change_permission(self, request, obj=None):
       if request.method not in ('GET', 'HEAD'):
           return False
       return super(ReadOnlyModelAdmin, self).has_change_permission(request, obj)

   def has_delete_permission(self, request, obj=None):
       return False

class TestAdmin(ReadOnlyModelAdmin):
list_display = ('','',)
list_filter = ('',)
search_fields = ('',)