Django operator, which returns a queryset that follows and caches foreign key relationships, in order to avoid hitting the database in future calls that require use of foreign keys.
Questions tagged [django-select-related]
147 questions
0
votes
1 answer
How can I return all the fields related to user model when user login?
I want to show all the related to user model field as the user logins in response in a apiview.
Views .py code
class UserLoginView(APIView):
renderer_classes = [UserRenderer]
def post(self, request, format=None):
serializer =…
Muhammad Zarak Aamer
- 15
- 6
0
votes
1 answer
Django: select_related on a very simple relationship is not eliminating the N+1 problem
I have a strange situation. I've done so much reading on avoiding the N+1 problem and have tried prefetching but to no avail. My setup is like this:
Models:
class A(models.Model):
somefield1 = models.CharField(max_length=100)
somefield2 =…
kevlar
- 1,110
- 3
- 17
- 30
0
votes
1 answer
Django select_related doesn't optimize query
I have a problem with select_related. I don't know what I'm doing wrong but it doesn't work..
models.py
class OrganizerUser(models.Model):
"""This user manage Agents"""
user = models.OneToOneField(settings.AUTH_USER_MODEL,…
Ryan
- 77
- 1
- 7
0
votes
1 answer
How to use select_related in save method of a admin model
I would like to get the specific information from different model therefore I have use the method of select_related to fetch the data but I unable to save the record into db.
How to use select_related in save method?
Let say I have following…
joyce
- 21
- 1
0
votes
0 answers
Django : Why is string condition False if select_related field not coated in STR()?
In my function, my query is :
mappings = MappingField.objects.filter(
fl_fiche_header_flow_id=fhf.pk).order_by('fl_fiche_inside_field_position')
.select_related('fl_fiche_header_flow')
Why when I print (label is…
Abpostman1
- 158
- 1
- 8
0
votes
0 answers
How can i perform join operation in Django?
The project is basically a resume builder wherein user will fill all details like personal info, education info,projects,experiences in the form and the system will generate a resume in a certains format .
The database structure is somewhat like…
saurabh rana
- 1
- 1
0
votes
0 answers
How to sort and filter queryset based on select_related in Django ORM
I have two tables in my models as show below:
class Coin(models.Model):
coin_id = models.CharField(max_length=100, primary_key=True, unique=True)
name = models.CharField(max_length=100, null=True, blank=True)
class…
Huzaifa Zahoor
- 325
- 2
- 13
0
votes
1 answer
use of select_related in this case of django rest?
I have a situation where I am not sure whether I would be using select_related or not. I have a model like this:
class Example(models.Model):
title = models.CharField(max_length=255, blank=True)
message = models.TextField(blank=True)
…
Reactoo
- 916
- 2
- 12
- 40
0
votes
0 answers
Django select_related the join table only for a many-to-many relation
I have a Django application with a model A with a ManyToManyField bees to model B:
from django.db import models
class A(models.Model):
bees = models.ManyToManyField("B", related_name="aas", blank=True)
field1 = models.TextField()
…
JanKanis
- 6,346
- 5
- 38
- 42
0
votes
2 answers
Use of select_related in simple query in django
I have a model in Django in which a field has a fk relationship with the teacher model. I have came across select_related in django and want to use it in my view. However, I am not sure whether to use it in my query or not.
My models:
class…
Reactoo
- 916
- 2
- 12
- 40
0
votes
0 answers
API endpoint for django `Group` model generating excess number of queries
I am trying to build an endpoint for the default django's Group model, which has name and permissions fields:- Here are my view and serializers:-
Serializers.py:-
class GroupSerializer(serializers.ModelSerializer):
class Meta:
model =…
Manish Shah
- 331
- 5
- 18
0
votes
1 answer
Django select_related Not Working as Expected
I have 2 classes, Country and Coordinates. When making an API call to the Country table, I would like the API (using DRF) to return the related Coordinate information as well.
By default, the following is understandably returned…
André Foote
- 366
- 3
- 15
0
votes
1 answer
Nested select_related to get data from various models django ORM
i have 5 models below:
class Products:
product_name=models.CharField(max_length=300,blank=True)
product_price=models.IntegerField(blank=True)
class ProductImages(models.Model):
…
Muhammad Nabeel
- 111
- 1
- 14
0
votes
1 answer
Using select_related in django view increases query times
I thought of trying to use select_realted in Django view to boost the performance. And I compare the results before using select_realted and after using it.
Although I see the reduction of significant number of queries, the time however rises. So I…
Reactoo
- 916
- 2
- 12
- 40
0
votes
1 answer
How to perform Outer Joins using Django ORM?
I have the following models:
class Partner(models.Model):
partner_name = models.CharField(max_length=50)
class Allocation(models.Model):
partner = models.ForeignKey(
Partner,
related_name='partner_allocations',
…
Tushar Mittal
- 121
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- 4