Question:

Ways to access instances of models in view in order to save both forms at once in Django

Problem

I am trying to combine two models into one form. However I cannot save the form as it is not an instance of the models. What I'm after is a way to access the models as instances and then save them. I am using crispy forms, I have described what I have tried at the bottom of the post, I have no idea why this is not working so as always any help is appreciated.

This is my model.py file:

from Django.db import models

# Create your models here.

BOOKING_STATUS = ((0, 'To be confirmed'), (1, 'Confirmed'), (2, 'Declined'))

class Customer(models.Model):

first_name = models.CharField(max_length=80)

last_name = models.CharField(max_length=80)

email = models.EmailField()

phone_number = models.CharField(max_length=20)

def __str__(self):

return f"Customer {self.first_name + ' ' + self.last_name}"

class Booking(models.Model):

booking_date = models.DateField()

booking_time = models.TimeField()

number_attending = models.IntegerField(default=2)

booking_status = models.IntegerField(choices=BOOKING_STATUS, default=0)

customer = models.ForeignKey('Customer', on_delete=models.CASCADE)

def __str__(self):

return f"Booking by {self.customer}"

forms.py:

from .models import Customer, Booking

from django import forms

class CustomerForm(forms.ModelForm):

class Meta:

model = Customer

fields = '__all__'

class BookingForm(forms.ModelForm):

class Meta:

model = Booking

fields = ('booking_date', 'booking_time', 'number_attending')

class CustomerBookingForm(forms.Form):

customer_form = CustomerForm()

booking_form = BookingForm()

and my view.py

from django.shortcuts import render

from .forms import CustomerBookingForm

# Create your views here.

# https://stackoverflow.com/questions/51459435/django-create-multiple-instance-of-model-with-one-form

def customer_booking(request):

if request.method == 'POST':

customer_booking_form = CustomerBookingForm(request.POST)

# if customer_booking_form.is_valid():

else:

customer_booking_form = CustomerBookingForm()

context = {

'form': customer_booking_form,

}

return render(request, 'booking.html', context)

I have tried:

booking_instance = customer_booking_form.cleaned_data['booking_form'].save()

However, this is not recognizing the fields 'customer_form' or 'booking_form'

Solution

Instantiate both forms in your view, just add a prefix argument to at least one of them.

def customer_booking(request):

if request.method == "POST":

customer_form = CustomerForm(request.POST, prefix="customer")

booking_form = BookingForm(request.POST, prefix="booking")

# if customer_form.is_valid()

# if booking_form.is_valid()

.....

else:

customer_form = CustomerForm(prefix="customer")

booking_form = BookingForm(prefix="booking")

The prefix will let Django give each form a unique namespace. So, the field name values will have the specified prefix for that ModelForm, i.e., customer-first_name, booking-booking_time, etc.

Answered by: >McPherson

Credit: >StackOverflow

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