I want to send JsonResponse with related objects. Here's my playground.
I do it as
def get_stocks(qty=9):
return Stock.objects.values()[:9]
# Returning stocks
stocks = api_services.get_stocks()
return JsonResponse(list(stocks), safe=False)
My models are like
class Sector(models.Model):
name = models.CharField(max_length=200, null=True, blank=True)
original_name = models.CharField(max_length=200)
slug = models.CharField(max_length=200)
class Industry(models.Model):
name = models.CharField(max_length=200, null=True, blank=True)
original_name = models.CharField(max_length=200)
slug = models.CharField(max_length=200)
class Stock(models.Model):
name = models.CharField(max_length=200)
ticker = models.CharField(max_length=200, unique=True)
logo = models.CharField(max_length=200, null=True, blank=True)
website = models.CharField(max_length=200, null=True, blank=True)
sector = models.ForeignKey(Sector, on_delete=models.CASCADE, null=True)
industry = models.ForeignKey(Industry, on_delete=models.CASCADE, null=True)
How can I get my json with related objects? Now I get
0 Object { id: 1, name: "Tesla", ticker: "TSLA", … }
id 1
name "Tesla"
ticker "TSLA"
logo null
website "http://www.tesla.com"
sector_id 1
industry_id 1
I need to get sector and industry as well
You'll need to look up the model entry for the given ID in the Stock model. You can do that in your get_stocks method. Another option would be using a Stock serializer.
For example:
def get_stocks(qty=9):
stocks = Stock.objects.all()[:qty]
for stock in stocks:
try:
stock.sector = Sector.objects.get(id=stock.sector)
except Sector.DoesNotExist:
pass
try:
stock.industry = Industry.objects.get(id=stock.industry)
except Industry.DoesNotExist:
pass
return stocks
Related
I have model name Movie which have many-to-many Relation with Actor Table. Actor Table is further many-to-many relation with Celebrity-Role.
My question is i need only unique values on the base of roles Like Actors who's role is Director they show in Movie Table field with Director and only directors should be there and so on.
i share my models please have a look.
class CelebrityRole(models.Model):
CELEBRITY_CHOICES = (
('Actor', 'Actor'),
('Producer', 'Producer'),
('Writer', 'Writer'),
('Director', 'Director'),
)
role = models.CharField(max_length=8,
choices=CELEBRITY_CHOICES)
def __str__(self):
return self.role
class Actor(models.Model):
GENDER = (
('Male', 'Male'),
('Female', 'Female'),
)
name = models.CharField(max_length=200)
rank = models.CharField(max_length=5, default=0)
gender = models.CharField(max_length=6, choices=GENDER)
avatar = models.ImageField(upload_to='CelebrityGallery/',
blank=True)
description = models.TextField(blank=True)
birth_place = models.CharField(max_length=200, blank=True)
dob = models.DateField(auto_now=False, auto_now_add=False)
height = models.CharField(max_length=20)
is_married = models.BooleanField(default=False)
movies = models.ManyToManyField(
'movies.Movie', related_name='movies', blank=True)
celebrity_role = models.ManyToManyField(CelebrityRole)
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)
def __str__(self):
return self.name
Here is my Movie Table
class Movie(models.Model):
title = models.CharField(max_length=200)
year = models.CharField(max_length=25, blank=True)
description = models.TextField(blank=True)
released = models.CharField(max_length=25)
runtime = models.CharField(max_length=25)
language = models.CharField(max_length=255)
country = models.CharField(max_length=100)
metascore = models.CharField(max_length=5, blank=True)
imdb_id = models.CharField(max_length=10, blank=False,
unique=True, default='tt3032400')
imdb_rating = models.CharField(max_length=5, blank=True)
imdb_votes = models.CharField(max_length=100, blank=True)
budget = models.CharField(max_length=25)
box_office = models.CharField(max_length=25, blank=True)
imdb_original = models.BooleanField(default=False)
type = models.CharField(max_length=10, blank=True)
season = models.CharField(max_length=2, default=0,
blank=True)
episode = models.CharField(max_length=3, default=0,
blank=True)
poster_url = models.ImageField(upload_to='Posters/',
blank=True)
video_poster_url =
models.ImageField(upload_to='VideoPosters/', blank=True)
video_url = models.TextField(validators=[URLValidator()],
blank=True, max_length=2000)
genre = models.ManyToManyField(Genre,
related_name='genre_movies')
image_gallery = models.ManyToManyField(ImageGallery,
blank=True)
video_gallery = models.ManyToManyField(VideoGallery,
blank=True)
director = models.ManyToManyField(Actor,
related_name='director')
writer = models.ManyToManyField(Actor,
related_name='writer')
actors = models.ManyToManyField(Actor,
related_name='actors')
producer = models.ManyToManyField(Actor,
related_name='producer')
def __str__(self):
return self.title
I'm not sure how you can do it in your models.py. But you can use the filter method in your views.py when making queries to filter actors whose role is director, etc.
Im working in my Python Django ecommerce project.Now i have 2 classes Item and BookItem :
class Item(models.Model):
item_name = models.CharField(max_length=200, unique=True)
slug = models.SlugField(max_length=200,unique=True)
description = models.TextField(max_length=500, blank=True)
price = models.IntegerField()
images = models.ImageField(upload_to='photos/products')
stock = models.IntegerField()
is_available = models.BooleanField(default = True)
category = models.ForeignKey(Category,on_delete = models.CASCADE)
created_date = models.DateTimeField(auto_now=True)
modified_date= models.DateTimeField(auto_now=True)
def __str__(self):
return self.item_name
def get_url(self):
return reverse('item_detail',args=[self.category.slug, self.slug])
class BookItem(Item):
book = models.ForeignKey(Book,on_delete = models.CASCADE)
I want to get BookItem data from the class Item.Anyone knows how to do it ?
Get Book data for all Items
Item.objects.all().values(
"book__book_name",
"book__import_price",
# "class_name__field_name", structure of the query
)
To filter Item data using Book fields
[filter Items where book name is 'bookname']
Item.objects.filter(book__book_name="bookname")
I have the following two models ASPBoookings and Athlete. The Athlete model is linked to the ASPBookings model by the foreign key named athlete.
I am trying to create a loop that will cycle through all of the bookings in the ASPBooking table and find out which is the most recent booking by each athlete (the table can contain multiple bookings each to the same or different athletes (athlete_id).
Once I have this information (booking_date and athlete_id), I then want to be able to automatically update the "Lastest ASP Session Field" in the Athlete Model.
This is what I have tried so far. I can cycle through the bookings in the ASPBookings table and retrieve and update the "Latest ASP Session Field" using the booking_date and athlete_id, but I cannot do this for multiple different athletes that are within the table. Currently the view just identifies the latest booking and the assigned athlete_id and then updates the field.
Thanks in advance for any help.
Below is the code:
ASPBookings Model
class ASPBookings(models.Model):
asp_booking_ref = models.CharField(max_length=10, default=1)
program_type = models.CharField(max_length=120, default='asp')
booking_date = models.DateField()
booking_time = models.CharField(max_length=10, choices=booking_times)
duration = models.CharField(max_length=10, choices=durations, default='0.5')
street = models.CharField(max_length=120)
suburb = models.CharField(max_length=120)
region = models.CharField(max_length=120, choices=regions, default='Metro')
post_code = models.CharField(max_length=40)
organisation_type = models.CharField(max_length=120,choices=organisation_types, default='Government School')
audience_number = models.CharField(max_length=10)
presentation_form = models.CharField(max_length=120, choices=presentation_form_options, default='Face to Face')
contact_name = models.CharField(max_length=80)
email = models.EmailField()
phone_number = models.CharField(max_length=120)
comments = models.TextField()
status = models.CharField(max_length=80, choices=statuses, default='TBC')
email_sent = models.BooleanField(default=False)
athlete = models.ForeignKey(Athlete, default= '1', on_delete=models.CASCADE)
def __str__(self):
return self.contact_name
# return URL after the POST has been submitted.
def get_absolute_url(self):
return reverse('vistours:success')
Athlete Model
class Athlete(models.Model):
athlete_ref = models.CharField(max_length=10, default=1)
athlete_name = models.CharField(max_length=80)
email = models.EmailField()
phone_number = models.CharField(max_length=120)
home = models.CharField(max_length=120)
education = models.CharField(max_length=120)
sport = models.CharField(max_length=120, choices=sports, default='1500m Runner')
notes = models.TextField(default='None')
gender = models.CharField(max_length=120, choices=genders, default='Not Specified')
para_athlete = models.BooleanField(blank=True)
working_with_children = models.BooleanField(blank=True)
expiry_date = models.DateField(blank=True, null=True)
available = models.BooleanField(blank=True)
available_from = models.DateField(blank=True, null=True)
bfbw = models.BooleanField(blank=True)
latest_bfbw_session = models.DateField(blank=True, null=True)
number_bfbw_sessions = models.CharField(blank=True, null=True, max_length=10)
asp = models.BooleanField(blank=True)
latest_asp_session = models.DateField(blank=True, null=True)
number_asp_sessions = models.CharField(blank=True, null=True, max_length=10)
tours = models.BooleanField(blank=True)
latest_tours_session = models.DateField(blank=True, null=True)
number_tours_sessions = models.CharField(blank=True, null=True, max_length=10)
def __str__(self):
return self.athlete_name
# return URL after the POST has been submitted.
def get_absolute_url(self):
return reverse('home')
View
# Complete first loop for inital values.
for date in asp_data:
if date.booking_date != None:
first_loop = date.booking_date
athl_id = date.athlete_id
break
# If next value is greater than inital value, replace current values.
for date in asp_data:
if date.booking_date != None:
if date.booking_date > first_loop:
first_loop = date.booking_date
athl_id = date.athlete_id
print(first_loop)
print(athl_id)
update_date = Athlete.objects.get(id=athl_id)
update_date.latest_asp_session = first_loop
update_date.save()
No need for loops. You can do this for all athletes in just one go using subqueries to leave all the heavy-lifting to your database:
from django.db.models import F, OuterRef, Subquery
bookings = ASPBookings.objects.filter(
athlete=OuterRef('pk')
).order_by('-booking_date')
Athlete.objects.annotate(
latest_asp_booking_date=Subquery(
bookings.values('booking_date')[:1]
)
).update(
latest_asp_session=F('latest_asp_booking_date')
)
Here is my models.py the idea of app is to have different objects (restaurants, services, etc) with different features (you can check each Model). But when I want to get all objecs Object.objects.all() I don't know which is the category for each of them.
models.py:
from django.db import models
from users.models import ProfileUser
from django.utils import timezone
# Create your models here.
class City(models.Model):
name = models.CharField(max_length=20)
def __str__(self):
return f"{self.name}"
class Object(models.Model):
author = models.ForeignKey(ProfileUser, on_delete=models.CASCADE)
title = models.CharField(max_length=300)
city = models.ForeignKey(City, on_delete=models.CASCADE)
address = models.CharField(max_length=300)
phone = models.CharField(max_length=20, default='')
email = models.CharField(max_length=100, default='')
site = models.CharField(max_length=100, default='')
facebook = models.CharField(max_length=100, default='')
instagram = models.CharField(max_length=100, default='')
content = models.TextField()
rating = models.IntegerField(default=10)
created_date = models.DateTimeField(default=timezone.now)
approved_object = models.BooleanField(default=False)
admin_seen = models.BooleanField(default=False)
def __str__(self):
return f"{self.title}"
class Restaurant(Object):
seats = models.IntegerField()
bulgarian_kitchen = models.BooleanField(default=False)
italian_kitchen = models.BooleanField(default=False)
french_kitchen = models.BooleanField(default=False)
is_garden = models.BooleanField(default=False)
is_playground = models.BooleanField(default=False)
class SportFitness(Object):
is_fitness_trainer = models.BooleanField(default=False)
class CarService(Object):
is_parts_clients = models.BooleanField(default=False)
class BeautySalon(Object):
is_hair_salon = models.BooleanField(default=False)
is_laser_epilation = models.BooleanField(default=False)
class FastFood(Object):
is_pizza = models.BooleanField(default=False)
is_duner = models.BooleanField(default=False)
is_seats = models.BooleanField(default=False)
class CarWash(Object):
is_external_cleaning = models.BooleanField(default=False)
is_internal_cleaning = models.BooleanField(default=False)
is_engine_cleaning = models.BooleanField(default=False)
class Fun(Object):
is_working_weekend = models.BooleanField(default=False)
is_kids_suitable = models.BooleanField(default=False)
class Other(Object):
is_working_weekend = models.BooleanField(default=False)
class Comment(models.Model):
object = models.ForeignKey(Object, on_delete=models.CASCADE, related_name='comments')
author = models.ForeignKey(ProfileUser, on_delete=models.CASCADE)
content = models.TextField()
rating = models.TextField()
created_date = models.DateTimeField(default=timezone.now)
def __str__(self):
return f"{self.content}"
You can not get the categories using the Object model.
Object class is created for a particular purpose:
it eliminates the need to declare certain characteristics of a class
Here you can use select_related or prefect_related to get the desired output.
OR
To fulfill your requirements you can use django-polymorphic for more detail you can refer the documentation.
This is how I did it:
Based on #wfehr commend and #Lokesh Pathak answer I implemented django-polymorphic, also added two additional rows(columns) to each model (only for Restaurants for now), so when foreach over all object I can print exact name of category, additional fields are
category_en_name = models.CharField(max_length=100, default='restaurants')
category_bg_name = models.CharField(max_length=100, default='Ресторант')
full models.py:
from django.db import models
from users.models import ProfileUser
from django.utils import timezone
from polymorphic.models import PolymorphicModel
# Create your models here.
class City(models.Model):
name = models.CharField(max_length=20)
def __str__(self):
return f"{self.name}"
class Object(PolymorphicModel):
author = models.ForeignKey(ProfileUser, on_delete=models.CASCADE)
title = models.CharField(max_length=300)
city = models.ForeignKey(City, on_delete=models.CASCADE)
address = models.CharField(max_length=300)
phone = models.CharField(max_length=20, default='')
email = models.CharField(max_length=100, default='')
site = models.CharField(max_length=100, default='')
facebook = models.CharField(max_length=100, default='')
instagram = models.CharField(max_length=100, default='')
content = models.TextField()
rating = models.IntegerField(default=10)
created_date = models.DateTimeField(default=timezone.now)
approved_object = models.BooleanField(default=False)
admin_seen = models.BooleanField(default=False)
def __str__(self):
return f"{self.title}"
class Restaurant(Object):
seats = models.IntegerField()
bulgarian_kitchen = models.BooleanField(default=False)
italian_kitchen = models.BooleanField(default=False)
french_kitchen = models.BooleanField(default=False)
category_en_name = models.CharField(max_length=100, default='restaurants')
category_bg_name = models.CharField(max_length=100, default='Ресторант')
is_garden = models.BooleanField(default=False)
is_playground = models.BooleanField(default=False)
class SportFitness(Object):
is_fitness_trainer = models.BooleanField(default=False)
So I can take only Restaurants in views.py:
objects = Object.objects.instance_of(Restaurant)
And in template, I can show category name of each restaurant:
{% for object in objects %}
{{ object.category_bg_name }}
{% endfor %}
I am still learning to use Django and so I am a bit unclear on something.
I have a product model and category model. A product can lie in multiple categories and multiple categories can have the same product.
So, its a many to many relationship. Now, I want to allow the user to select multiple categories from the html and then I want to save the categories and link them to the category object in my product model. I am completely lost about it.
One way would be to use Modelform but I dont want to go that way. Is there any other way I can accomplish this?
models.py:
class Category(models.Model):
name = models.CharField(max_length=50)
slug = models.SlugField(max_length=50, unique=True,
help_text='Unique value for product page URL, created from name.')
description = models.TextField()
is_active = models.BooleanField(default=True)
meta_keywords = models.CharField("Meta Keywords", max_length=255,
help_text='Comma-delimited set of SEO keywords for meta tag')
meta_description = models.CharField("Meta Description", max_length=255,
help_text='Content for description meta tag')
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)
def __str__(self):
return self.name
def get_absolute_url(self):
return reverse('catalog:categories', kwargs={'category_slug': self.slug})
class Meta:
ordering = ['-created_at']
verbose_name_plural = 'Categories'
class Product(models.Model):
name = models.CharField(max_length=255, unique=True)
slug = models.SlugField(max_length=255, unique=True,
help_text='Unique value for product page URL, created from name.')
brand = models.CharField(max_length=50)
sku = models.CharField(max_length=50)
price = models.DecimalField(max_digits=9, decimal_places=2)
old_price = models.DecimalField(max_digits=9, decimal_places=2, blank=True, default=0.00)
thumbnail = models.FileField(upload_to='static/images/products/thumbnails')
imageurls = models.CharField(max_length=1000)
is_active = models.BooleanField(default=True)
is_bestseller = models.BooleanField(default=False)
is_featured = models.BooleanField(default=False)
quantity = models.IntegerField()
description = models.TextField()
meta_keywords = models.CharField(max_length=255, help_text='Comma-delimited set of SEO keywords for meta tag')
meta_description = models.CharField(max_length=255, help_text='Content for description meta tag')
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)
categories = models.ManyToManyField(Category)
def __str__(self):
return self.name
def get_absolute_url(self):
return reverse('catalog:products', kwargs={'product_slug': self.slug})
def sale_price(self):
if self.old_price > self.price:
return self.price
else:
return None
class Meta:
ordering = ['-created_at']
part of views.py:
if request.method =='POST':
print ('entered')
name = request.POST['name']
brand = request.POST['brand']
sku = request.POST['sku']
price = request.POST['price']
quantity = request.POST['quantity']
description = request.POST['description']
imageurls = request.POST['urls']
print('imageurls',imageurls)
categorylist = request.POST['categories']
print('categorylist',categorylist)
categories = re.findall(r"[\w']+", categorylist)
print categories
imageurls = imageurls.split('~')
print('iageurls',imageurls)
for x in categories:
categoryobj = Category.objects.filter(name=x).values()
print ('categoryobj',categoryobj)
# Product.objects.create(name=name,sku=sku,brand=brand,price=price,quantity=quantity,description=description,imageurls=imageurls,categories=categoryobj)
return HttpResponse('success')
Try to save the above way gives me error.
product=Product.objects.create(name=name,sku=sku,brand=brand,price=price,quantity=quantity,description=description,imageurls=imageurls)
category_queryset = []
for x in categories:
category = Category.objects.filter(name=x).first()
category_queryset.append(category)
product.categories.set(category_queryset)