Code Explainers
Django code explainers
python
from django import forms from django.utils import timezone from .models import Reservation
Multi-field validation in a Django ModelForm
form validation
cross-field validation
modelform
Intermediate
7 steps
python
from django import template from django.urls import reverse, NoReverseMatch from django.utils.html import format_html
Active nav-link template tags in Django
template tags
url routing
active state
Intermediate
7 steps
python
import os from pathlib import Path BASE_DIR = Path(__file__).resolve().parent.parent.parent
How a Django settings module is wired
configuration
environment-variables
middleware
Intermediate
8 steps
python
from django.db.models import Q from .models import Order
DISTINCT ON queries in Django
orm
querysets
postgresql
Intermediate
7 steps
python
from decimal import Decimal, ROUND_HALF_UP from django.db import transaction from django.db.models import F
Batch price updates safely in Django
decimal-precision
batch-processing
transactions
Advanced
8 steps
python
from django.db import transaction from django.forms import inlineformset_factory from django.shortcuts import get_object_or_404, redirect, render
Editing an order with inline formsets in Django
formsets
transactions
crud
Intermediate
9 steps
python
from django.core.paginator import Paginator from django.shortcuts import render from .models import Product
Filtering and paginating a Django product list
queryset
pagination
filtering
Intermediate
7 steps
python
from pathlib import Path from django.contrib.auth.decorators import login_required from django.http import FileResponse, Http404, HttpResponseForbidden
Serving files with access checks in Django
authorization
http-caching
file-serving
Intermediate
7 steps
python
from django.db import models from django.db.models import Q from django.conf import settings
Enforcing one default address per user in Django
data modeling
database constraints
partial index
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
from django.contrib.postgres.search import SearchQuery, SearchRank, SearchVector from django.core.cache import cache from django.db.models import F from django.http import JsonResponse
Ranked full-text search in Django
full-text-search
debouncing
caching
Advanced
9 steps
python
from django.contrib import admin from django.utils import timezone from django.utils.html import format_html
Custom columns in the Django admin
admin-customization
computed-columns
html-rendering
Intermediate
7 steps
python
from django.contrib.auth.mixins import LoginRequiredMixin from django.views.generic import ListView from .models import Invoice
Building a scoped, filtered ListView in Django
class-based views
queryset filtering
authentication
Intermediate
7 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 functools import wraps from django.core.cache import cache from django.http import JsonResponse
Building a rate-limit decorator in Django
decorators
rate limiting
caching
Intermediate
7 steps
python
from decimal import Decimal from django.db import transaction from django.core.exceptions import ValidationError
Placing an order atomically in Django
transactions
row-locking
concurrency
Advanced
9 steps
python
from django.core.cache import cache from django.db.models import Count, Sum, Q from django.utils import timezone
Caching a Django dashboard aggregate query
caching
aggregation
conditional-queries
Intermediate
7 steps