Django 2.2 LTS
What's new?
Kalil de Lima - Python Meetup 2019
github.com/kaozdl
kalil.de.lima@fing.edu.uy
kalil@rootstrap.com
From where do we come?
April 2017 - Django 1.11
Last version to support Python 2
What is Django?
Full fledged web framework for python
First version is from 2005
Implements the MVT pattern
Key Features
Powerful ORM
Wide library ecosystem
Great defaults
Easily customizable
Recent History
In April of 2017 Django shipped version 1.11 - LTS
This was the last version of django which included support for python 2.7
After that the community started to work in a new major release of the framework.
What happened since then?
-
Django 2.0
-
Django 2.1
-
Django 2.2
One major release, and two minor ones
Django 2.0
path function in django.urls
Responsive admin
Star features
Quality of Life Improvements
values_list can now return named tuple
earliest, latest now accept multiple args
squashmigrations now allows to name the squashed migration
inspectdb now instrospects JSONFields in postgres
Old URL paths
New Url paths
Django 2.1
view permission allows read only access to models
Star features
Quality of Life Improvements
createsuperuser now allows bypassing password validations
BooleanField now accepts null=True NullBooleanField discouraged
The new Queryset.explain() method shows db execution plan
Queryset.explain
Django 2.2
Constraints
Star features
Quality of Life Improvements
ignore_conflicts argument for Queryset.bulk_create
New Queryset.bulk_update method
Smarter single query transaction policy
request.headers attribute
Constraints
Performed at database level
Require a migration
Method independent
Work nicely in batches
Constraints in Model.meta
Batch operations
bulk_create
Multiple objects created per query
ignore_conflicts parameter
Does not handle many-to-many cases
Objects need to be
handled in memory
bulk_update
Updates several objects
in a single query
Extra queries for multi-table inheritance
Objects need to be
handled in memory