Acessing data on Model/Detail classes

[Fabiano Martins]

Hi, I'm novice on Django, and I have a problem that I can't resolve through documentation. I like to make a validation on Model.clear() of the master class method based on data of your detail classes, but it returns always a empty set. This example illustrates my problem: 1) on admin.py: from mdtest.models import Master, Product, Service from django.contrib import admin from django import forms class ProductInline(admin.TabularInline):     model = Product     extra = 0 class ServiceInline(admin.TabularInline):     model = Service     extra = 0 class MasterForm(forms.ModelForm):     class Meta:         model = Master class MasterAdmin(admin.ModelAdmin):     form = MasterForm        inlines = [ProductInline, ServiceInline, ] admin.site.register(Master, MasterAdmin) 2) on models.py: from django.db import models from django.core.exceptions import ValidationError class Master(models.Model):     MIN_VALUE = 100.00     date = models.DateField()     description = models.CharField(max_length=200)         def clean(self):         super(Master, self).clean()         total = 0         for product in self.product_set.all():             total += product.value         for service in self.service_set.all():             total += service.value         print "Sum is " + str(total)         if total < self.MIN_VALUE :             raise ValidationError("Value can't lower than " + str(self.MIN_VALUE)) class Product(models.Model):     master = models.ForeignKey(Master)     description = models.CharField(max_length=200)     value = models.DecimalField(max_digits=12, decimal_places=2) class Service(models.Model):     master = models.ForeignKey(Master)     description = models.CharField(max_length=200)     value = models.DecimalField(max_digits=12, decimal_places=2) ========================== This example contains a Master class that contains two detail classes: one "product" and one "service".  The constraint of Master requires that the sum of "value" fields of both details classes are greater than 100.00. When I run this example, click on "add master", fill a master and some details and click "Save". the "total" variable at clean() method always result on 0. How do I do to access data from detail classes from methods at the master class? Thanks in advance, Fabiano Martins -- Fabiano Martins Unidade de Aplicativos e Internet Divisão de Informática MPRS -- You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com. To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.