Django 0: Simplifies Database-Computed Values
The newly introduced Field.db_default parameter enables a Django developer to set a database-computed value for a particular field. The value can be a simple one or a database function like “Now”. For example, a “DateTimeField” can use “Now()” as its default value.
Developers can also set more complex defaults if those defaults are made from simple values and database functions. However, the defaults cannot refer to other fields or models. When both “db_default” and “Field.default” are specified, Django will apply the former at the database level and the latter in the Python code. This helps developers add rows from the ORM or insert new fields during migration.
Simple default value:
Python3
from django.db import models from django.db.models.functions import Now class MyModel(models.Model): created_at = models.DateTimeField(db_default=Now()) # Sets default to current time priority = models.IntegerField(db_default=0) # Sets default to 0 |
More Complex Default Value:
Python3
from django.db import models from django.db.models.functions import TruncMonth, Now, F class MyModel(models.Model): month_due = models.DateField( db_default=TruncMonth(Now() + timedelta(days=90), output_field=models.DateField()) ) # Sets default to the first day of the month 90 days from now end = models.IntegerField(db_default=F("start") + 50) # Sets default to 50 more than the "start" field |
Django 5.0: Significant Features for Web Development in 2024
Django released its latest major version, Django 5.0, on December 4, 2023. This version also offers new features, deprecations, updated functionalities, and more that Django developers can utilize to enhance web application development processes. For a better understanding, let us delve deeper into this version’s core and minor features. In this article we discuss the Django 5.0: Significant Features for Web Development in 2024 those are following.
Django 5.0
Table of Content
- Django 5.0: Significant Features for Web Development in 2024
- Managing Admin Changelist Facet Counts
- Form Field Rendering Enhancements
- Simplifies Database-Computed Values
- Database-Generated Columns with “GeneratedField”
- Flexible Model and Form Field Choices
- Minor Features Overview
- Django 5.0 Syntax Updates
- Conclusion