"Django 4.1.4 英文文档下载与阅读指南"

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The Django Documentation for version 4.1.4 provides a comprehensive guide for developers looking to learn and utilize the Django web framework. Released by the Django Software Foundation on November 28, 2022, this documentation covers a wide range of topics to help users get started with Django. The documentation begins with an introduction to the first steps in using Django, providing beginners with a basic understanding of the framework and its features. It then offers guidance on how to seek help when encountering issues or needing further clarification. The organization of the documentation is detailed, with sections dedicated to different aspects of Django such as the model layer, views, templates, forms, and more. Each section provides in-depth explanations, code examples, and best practices to help users navigate and utilize Django effectively. One of the key highlights of the documentation is the emphasis on the model layer, which plays a crucial role in defining the data structure for Django applications. Users can learn how to create models, handle database queries, and work with model relationships to build robust and scalable web applications. Overall, the Django Documentation for version 4.1.4 is a valuable resource for developers seeking to enhance their skills in Django development. Whether you are a beginner or an experienced developer, this documentation offers valuable insights and guidance to help you make the most of Django and build high-quality web applications. If you are interested in learning Django and exploring its capabilities, downloading and reading the Django 4.1.4 English documentation is recommended for a comprehensive understanding of the framework.

Django Documentation, Release 4.1.4.dev20221128071440

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# Change an object by altering its attributes and calling save().

>>> r.full_name = 'Billy Goat'

>>> r.save()

# Delete an object with delete().

>>> r.delete()

2.1.4 A dynamic admin interface: it’s not just scaolding –it’s the whole house

Once your models are de󰖌ned, Django can automatically create a professional, production ready administra-

tive interface –a website that lets authenticated users add, change and delete objects. The only step required

is to register your model in the admin site:

Listing 2: mysite/news/models.py

from django.db import models

class Article(models.Model):

pub_date = models.DateField()

headline = models.CharField(max_length=200)

content = models.TextField()

reporter = models.ForeignKey(Reporter, on_delete=models.CASCADE)

10 Chapter 2. Getting started

Django Documentation, Release 4.1.4.dev20221128071440

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{% for article in article_list %}

{{ article.headline }}

By {{ article.reporter.full_name }}

Published {{ article.pub_date|date:"F j, Y" }}

{% endfor %}

{% endblock %}

Variables are surrounded by double-curly braces. {{ article.headline }} means“Output the value of the

article’s headline attribute.”But dots aren’t used only for attribute lookup. They also can do dictionary-key

lookup, index lookup and function calls.

Note {{ article.pub_date|date:"F j, Y" }} uses a Unix-style“pipe”(the“|”character). This is called

a template 󰖌lter, and it’s a way to 󰖌lter the value of a variable. In this case, the date 󰖌lter formats a Python

datetime object in the given format (as found in PHP’s date function).

You can chain together as many 󰖌lters as you’d like. You can write custom template 󰖌lters. You can write

custom template tags, which run custom Python code behind the scenes.

Finally, Django uses the concept of “template inheritance”. That’s what the {% extends "base.html"

%} does. It means “First load the template called ‘base’, which has de󰖌ned a bunch of blocks, and 󰖌ll the

blocks with the following blocks.”In short, that lets you dramatically cut down on redundancy in templates:

each template has to de󰖌ne only what’s unique to that template.

Here’s what the “base.html”template, including the use of static 󰖌les, might look like:

Listing 7: mysite/templates/base.html

{% load static %}

<html>

<head>

<title>{% block title %}{% endblock %}</title>

</head>

<body>

{% block content %}{% endblock %}

</body>

</html>

Simplistically, it de󰖌nes the look-and-feel of the site (with the site’s logo), and provides “holes”for child

templates to 󰖌ll. This means that a site redesign can be done by changing a single 󰖌le –the base template.

It also lets you create multiple versions of a site, with di󰖋erent base templates, while reusing child templates.

Django’s creators have used this technique to create strikingly di󰖋erent mobile versions of sites by only

creating a new base template.

2.1. Django at a glance 13

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