Django新手：选择内置User模型还是自定义User模型？求利弊解析

Hey there! As someone who's navigated this exact question early on with Django, I totally get the mix of hesitation and curiosity—built-in tools feel reliable but can feel limiting when you're thinking about your project's future. Let's break this down clearly, starting with the pros and cons of Django's default django.contrib.auth.models.User model, then wrap up with practical advice for your situation.

Pros of the Built-in User Model #

• Zero setup hassle: You don't need to write any model code, migrations, or basic auth logic. It's ready to use out of the box—perfect for spinning up prototypes, small tools, or learning projects where you want to focus on core Django concepts first.
• Seamless integration with Django's auth ecosystem: All built-in auth tools (like AuthenticationForm, login/logout views, permission checks, and the admin user interface) work flawlessly with it. No tweaking or rewriting these components to fit a custom model.
• Battle-tested security: Django's core team maintains this model, so critical features like password hashing, session management, and protection against common auth vulnerabilities are already handled. For new developers, this avoids a ton of easy-to-make security mistakes.
• Massive community & third-party support: Most Django packages (social auth libraries, admin extensions, etc.) are built to work with the default User model. You'll find way more tutorials, troubleshooting guides, and pre-built solutions for it compared to custom models.

Cons of the Built-in User Model #

• Rigid field structure: The default model only includes username, email, password, first_name, last_name, and a handful of status fields. If you need extra data (like a phone number, profile picture, or app-specific user roles), you'll have to create a separate Profile model linked via OneToOneField—this adds extra database queries and complexity when accessing user data.
• Username as the default login identifier: By default, users log in with a username instead of an email. While you can override the authentication backend to use email, it's a clunky workaround compared to just setting USERNAME_FIELD = 'email' directly in a custom model.
• Painful to modify later: If you start with the built-in User and decide you need a custom model down the line, migrating existing user data is tricky. You'll have to write custom migration scripts, which can be error-prone especially if you have a lot of user-related data already stored.
• Limited auth logic customization: Want to add custom password validation rules, or unique user statuses (like "verified" vs. "unverified")? You can do this with signals or custom managers, but it's far less straightforward than building these directly into a custom model.

Practical Advice for New Developers #

• Stick with the built-in model for simple projects: If you're building a basic blog, personal tool, or learning project where you only need standard login/signup (username/email + password), the default User model is more than enough. It lets you skip the auth model setup and focus on learning Django's core features.
• Go custom early if you know you need flexibility: If you already know you'll need extra user fields, want email-based login, or anticipate scaling your app's auth needs later—start with a custom model. Use AbstractUser (which inherits all built-in fields and methods, so you can just add your own) instead of AbstractBaseUser (which requires reimplementing more auth logic) to keep things simple.
• Don't force custom models just to "learn": While building a custom User model will teach you a lot about Django's auth system, it's better to first get comfortable with the built-in tools. Once you understand how login, permissions, and user management work, you can experiment with custom models to level up your skills gradually.

内容的提问来源于stack exchange，提问作者Sno Bear