管理员中的 Django 模型 pre_save 验证

Question

以下是我的模型：

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)

我正在尝试在保存模型之前验证 product_offer_price。验证错误已成功引发，但在调试器创建的异常页面上。如何像管理表单引发的其他错误一样在管理员本身的表单上显示错误？

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)