modèle Django pre_save Validation dans Admin

Question

Suite est mon modèle:

class Product(models.Model): 
    product_title = models.CharField(max_length=100, null=False, 
verbose_name='Product title') 
    product_description = models.TextField(max_length=250, 
verbose_name='Product description') 
    product_qty = models.IntegerField(verbose_name='Quantity') 
    product_mrp = models.FloatField(verbose_name='Maximum retail price') 
    product_offer_price = models.FloatField(verbose_name='Selling price') 

def validate_produce_offer_price(sender, instance, **kwargs): 
    if instance.product_offer_price > instance.product_mrp: 
     from django.core.exceptions import ValidationError 
     raise ValidationError('Product offer price cannot be greater than 
Product MRP.') 


pre_save.connect(validate_produce_offer_price, sender=Product) 

Je suis en train de valider la product_offer_price avant que le modèle est enregistré. L'erreur de validation est levée avec succès, mais sur une page d'exception créée par le débogueur. Comment montrer l'erreur sur le formulaire dans l'admin lui-même comme d'autres erreurs soulevées par le formulaire d'administration?

Answer 1

models.py

from django.db import models 

class Product(models.Model): 
    product_title = models.CharField(max_length=100, null=False, 
verbose_name='Product title') 
    product_description = models.TextField(max_length=250, 
verbose_name='Product description') 
    product_qty = models.IntegerField(verbose_name='Quantity') 
    product_mrp = models.FloatField(verbose_name='Maximum retail price') 
    product_offer_price = models.FloatField(verbose_name='Selling price') 

forms.py

from models import Product 
from django import forms 

class ProductForm(forms.ModelForm): 
    class Meta: 
     model = Product 
     exclude = [id, ] 

    def clean(self): 
     product_offer_price = self.cleaned_data.get('product_offer_price') 
     product_mrp = self.cleaned_data.get('product_mrp') 
     if product_offer_price > product_mrp: 
      raise forms.ValidationError("Product offer price cannot be greater than Product MRP.") 
     return self.cleaned_data 

admin.py

from django.contrib import admin 
from forms import ProductForm 
from models import Product 

class ProductAdmin(admin.ModelAdmin): 
    form = ProductForm 
    list_display = ('product_title', 'product_description', 'product_qty', 'product_mrp', 'product_offer_price') 

admin.site.register(Product, ProductAdmin)