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User 模型与 authenticate()

使用内置用户验证凭据

User 模型与 authenticate() 是 CoddyKit 上的免费 Django Academy 课时。这是第 1 节课，共 4 节。你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。这是 Django Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Django Academy 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

You Already Have Users

Django ships a full User model out of the box, so you never write account tables by hand. It stores usernames, hashed passwords, and more. 👤

Where the User Lives

The model sits in django.contrib.auth, an app that is enabled in fresh projects. Import it and the whole auth toolkit comes along.

from django.contrib.auth.models import User

Key User Fields

Each user has a username, plus email, first_name, and last_name. These are the everyday fields you read and display in your app.

Passwords Are Never Plain

Django stores a salted hash of every password, never the raw text. Even you, the developer, cannot read a user's actual password. 🔒

Create a User Safely

Use create_user so the password gets hashed for you. Setting the password by hand would store it in the clear.

User.objects.create_user(username="ada", password="secret123")

Meet authenticate()

The authenticate() function checks a username and password against the database for you. It is the heart of every login flow.

from django.contrib.auth import authenticate

How authenticate() Works

Pass it the credentials and it returns the matching user object when they are correct. No hashing or lookups for you to write.

user = authenticate(username="ada", password="secret123")

When Credentials Fail

If the username or password is wrong, authenticate() returns None. Always check for that before treating the user as logged in.

if user is None:
    print("Invalid credentials")

Active Users Only

The is_active flag lets you disable accounts. By default authenticate() refuses to return inactive users, blocking banned logins.

Staff and Superusers

Two extra flags matter: is_staff grants admin-site access, and is_superuser grants every permission. Most users have neither.

Authenticate Is Not Login

Remember: authenticate() only verifies identity. It does not start a session, so the user is not yet logged in after this call.

Quick Check

What does authenticate() return when the password is wrong?

Recap: Users and Identity

You met Django's built-in User model and used authenticate() to verify credentials. Passwords stay hashed, and a failed check gives None. ✅

常见问题解答

「User 模型与 authenticate()」课时是免费的吗？

是的 — 「User 模型与 authenticate()」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Django Academy 课程的其余内容，请升级到 CoddyKit PRO。 Django Academy 课程共包含 4 节课。

「User 模型与 authenticate()」这节课中我会学到什么？

使用内置用户验证凭据你通过在浏览器中直接运行的动手代码来练习 Django Academy，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 Django Academy 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Django Academy 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。这是第 1 节课，共 4 节。

「User 模型与 authenticate()」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 Django Academy 课中编写并运行代码吗？

能。每节 Django Academy 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

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