Code Explainers

Code explainers tagged #querysets

python 
from django.db.models import Q
 
from .models import Order
 

DISTINCT ON queries in Django

orm querysets postgresql
Intermediate 7 steps
python 
from django.contrib.auth.mixins import LoginRequiredMixin, UserPassesTestMixin
from django.shortcuts import get_object_or_404
from django.views.generic import DetailView
 

Team membership access control in Django

access-control mixins class-based-views
Intermediate 7 steps
python 
import django_filters
from django import forms
from django.utils import timezone
 

Building a date-range FilterSet in Django

filtering querysets form-widgets
Intermediate 6 steps
python 
import csv
 
from django.http import StreamingHttpResponse
from django.utils.timezone import now

Streaming a CSV export in Django

streaming csv-export generators
Intermediate 7 steps
python 
from datetime import timedelta
 
from django.contrib.sessions.models import Session
from django.core.management.base import BaseCommand

A batched session-cleanup command in Django

management-command batch-processing database-cleanup
Intermediate 7 steps
python 
from django.db import models
from django.utils import timezone
 
 

How soft deletes work in Django

soft-delete querysets managers
Intermediate 10 steps