Я работаю над проектом, который требует использования мастера форм для заполнения трех связанных моделей.Первая модель - Listing - имеет общие данные, которые имеют отношение OneToOneField ко второй модели (Property).Модель Listing также имеет много-много связей с третьей моделью (ListingImages).В общем, я использую 4 формы в мастере.Вот это определение модели models.py
class Listing(models.Model):
listing_type_choices = [('P', 'Property'), ('V', 'Vehicle'), ('B', 'Business/Service'), ('E', 'Events')]
listing_title = models.CharField(max_length=255)
listing_type = models.CharField(choices=listing_type_choices, max_length=1, default='P')
status = models.BooleanField(default=False)
featured = models.BooleanField(default=False)
city = models.CharField(max_length=255, blank=True)
location = PlainLocationField(based_fields=['city'], zoom=7, blank=True)
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)
expires_on = models.DateTimeField(auto_now=True)
created_by = models.ForeignKey(User,
on_delete=models.CASCADE, editable=False, null=True, blank=True
)
listing_owner = models.ForeignKey(User,
on_delete=models.CASCADE, related_name='list_owner'
)
def __str__(self):
return self.listing_title
def get_image_filename(instance, filename):
title = instance.listing.listing_title
slug = slugify(title)
return "listings_pics/%s-%s" % (slug, filename)
class ListingImages(models.Model):
listing = models.ForeignKey(Listing, on_delete=models.CASCADE)
image_url = models.ImageField(upload_to=get_image_filename,
verbose_name='Listing Images')
main_image = models.BooleanField(default=False)
class Meta:
verbose_name_plural = "Listing Images"
def __str__(self):
return f'{self.listing.listing_title} Image'
class Property(models.Model):
sale_hire_choices = [('S', 'Sale'), ('R', 'Rent')]
fully_furnished_choices = [('Y', 'Yes'), ('N', 'No')]
listing = models.OneToOneField(Listing, on_delete=models.CASCADE)
sub_category = models.ForeignKey(PropertySubCategory, on_delete=models.CASCADE)
for_sale_rent = models.CharField(choices=sale_hire_choices, max_length=1, default=None)
bedrooms = models.PositiveIntegerField(default=0)
bathrooms = models.PositiveIntegerField(default=0)
rooms = models.PositiveIntegerField(default=0)
land_size = models.DecimalField(max_digits=10, decimal_places=2)
available_from = models.DateField()
car_spaces = models.PositiveIntegerField(default=0)
fully_furnished = models.CharField(choices=fully_furnished_choices, max_length=1, default=None)
desc = models.TextField()
property_features = models.ManyToManyField(PropertyFeatures)
price = models.DecimalField(max_digits=15, decimal_places=2)
currency = models.ForeignKey(Currency, on_delete=models.CASCADE)
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)
Вот это forms.py
from django import forms
from .models import Listing, Property, Vehicle, Business, ListingImages
from django.forms import modelformset_factory
class ListingDetails(forms.ModelForm):
class Meta:
model = Listing
fields = ['listing_title', 'city', 'location']
class PropertyDetails1(forms.ModelForm):
class Meta:
model = Property
fields = ['sub_category', 'for_sale_rent', 'bedrooms', 'bathrooms',
'rooms', 'land_size', 'available_from', 'car_spaces', 'fully_furnished',
'desc', 'currency', 'price'
]
class PropertyDetails2(forms.ModelForm):
class Meta:
model = Property
fields = ['property_features']
class ListingImagesForm(forms.ModelForm):
image_url = forms.ImageField(label='Listing Image',
widget=forms.ClearableFileInput(attrs={'multiple': True}),
required=False
)
class Meta:
model = ListingImages
fields = ['image_url']
ImageFormSet = modelformset_factory(ListingImages, form=ListingImagesForm, extra=3)
views.py
from django.shortcuts import render, redirect
import os
from .forms import ListingDetails, PropertyDetails1, PropertyDetails2, ListingImagesForm
from .models import ListingImages, Listing, Property
from formtools.wizard.views import SessionWizardView
from django.conf import settings
from django.core.files.storage import FileSystemStorage
from django.forms import modelformset_factory
from django.contrib import messages
from django.http import HttpResponseRedirect, HttpResponse
from django.forms.models import construct_instance
class PropertyView(SessionWizardView):
# formset = ImageFormSet(queryset=Images.objects.none())
template_name = "listings/create_property.html"
form_list = [ListingDetails, PropertyDetails1, PropertyDetails2, ListingImagesForm]
file_storage = FileSystemStorage(location=os.path.join(settings.MEDIA_ROOT, 'media'))
def done(self, form_list, **kwargs):
listing_instance = Listing()
property_instance = Property()
listing_instance.created_by = self.request.user
listing_instance.listing_owner = self.request.user
listing_instance.listing_type = 'P'
for form in form_list:
listing_instance = construct_instance(form, listing_instance, form._meta.fields, form._meta.exclude)
property_instance = construct_instance(form, property_instance, form._meta.fields, form._meta.exclude)
listing = listing_instance.save()
property_instance.listing = listing
property_instance.save()
return HttpResponse('data saved successfully')
Проблема, с которой я сталкиваюсьЯ могу сохранить модель Listing, но проблема заключается в получении ее основного идентификатора и использовании ее для сохранения модели Property.Опять же, модель ListingImages хранит изображения, связанные с моделью Listing.Как сохранить эти модели в базе данных, учитывая, что их несколько?