Interrupt the POST Django

Question

I am developing a customer registration project/ addresses/ products, and now I am doing the inventory part (list which products certain clients hired), and I put to send the customer ID and product, but the problem is time to check whether the customer/product exists before creating. In fact, he even checks to see if they exist, but he creates them in the database in the same way. This way I did, it does the POST, but puts in place the ID "ID not found", I wonder if there is any way I interrupt this post, it send some error message and not create in the database My models:

from django.db import models
import requests

class Base(models.Model):
    criado = models.DateField('Data de criação', auto_now_add=True)

    class Meta:
        abstract = True

class catalogo(Base):
    produto = models.CharField('Produto', max_length=50,null=False, blank=False, unique=True)
    preco = models.FloatField('Preço (R$)',null=True,blank=True, default=0)
    disponibilidadepacote = models.BooleanField('Disponível:',null=False,blank=False,default=True)

    def __str__(self):
        return self.produto

class pacotesContratados(Base):
    produto = models.IntegerField(blank=False, null=False)
    cliente = models.IntegerField(blank=False, null=False)

    @property
    def cliente_infos(self):
        url_cliente = "http://localhost:8000/clientes/" + str(self.cliente) + "/"
        resposta = requests.get(url_cliente, auth=('joel.neto','123'))
        resposta_data = resposta.json()

        if resposta.status_code == 200:
            return resposta_data
        else:
            return "Não existe cadastro para esse ID!"

Answer 1

Why don’t you care about your customer’s model and product in this view? By the way, I’m guessing there’s a model of them, you didn’t actually specify...

from clientes import Cliente
from produto import Produto

That way, instead of you using an Integerfield, you use a Foreign Key:

I’m not sure I understand the logic of your @Property and the relationship of it to what you said about saving or not saving at the base. I think the question is poorly formulated and lacking code to be understood.

But I would alter it so she would check in that way:

class pacotesContratados(Base):
    produto = models.ForeignKey(Produto , blank=False, null=False)
    cliente = models.ForeignKey(Cliente ,blank=False, null=False)

    @property
    def cliente_infos(self):
        cliente = Cliente.objects.filter(cliente=self.cliente)

        if cliente:
           // tem cliente, faz alguma coisa
        else:
           // nao tem cliente, faz outra coisa

It seems to me that it would be more appropriate to be in a view actually...