Is there a ModelAdmin method that runs after Model.clean()?

Using Django The Admin
1

I’m raising ValidationError in my model’s clean() method

from django.core.exceptions import ValidationError

class PosDetail(models.Model, PosDetailChecksMixin):
    self._errors = set()
    ...
    def clean(self, *args, **kwargs):
        if PosDetail.objects.filter(username=self.username).exists(): # example ValidationError
            self._errors.add('check_duplicates')
            raise ValidationError("This username is already in use.", code="invalid")
        return super().clean(*args, **kwargs)

the ValidationError then is shown in the admin change view form after a POST request.

i want to show a button in the admin change view after form submission

i tried the save_model method but i dose not execute if a ValidationError is raised. i also tried to override the change_view method of the ModelAdmin but it executes before the Model clean method so it misses the validations.

@admin.register(PosDetail)
class BddDetailAdmin(admin.ModelAdmin):
    ...
    def change_view(self, request, object_id, form_url="", extra_context=None):
        extra_context = extra_context or {}
        pos_detail = self.get_object(request, object_id)
        
        if request.POST:
            if pos_detail and 'check_duplicates' in pos_detail._errors:
                extra_context['show_save_anyway'] = True
            else:
                extra_context['show_save_anyway'] = False
        return super().change_view(request, object_id, form_url, extra_context)

Is there a ModelAdmin method that runs after Model.clean() ? so i can catch the ValidationError that accur in the Model.clean method.

2

maybe via save_model method.