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Python 零基础100天—Day63 Django 表单与认证

  • 2026-08-18 23:10:42
Python 零基础100天—Day63 Django 表单与认证

Django 表单与认证 — 用户交互的桥梁

🕐 预计用时:2-3 小时 | 🎯 目标:掌握 Django Form/ModelForm、用户认证系统和权限控制


📖 今日目录

  1. Django 表单 vs WTForms
  2. Form 基础
  3. ModelForm(重点)
  4. 表单在模板中渲染
  5. 文件上传
  6. Django 认证系统
  7. 自定义注册/登录
  8. 权限控制
  9. 今日练习
  10. 今日小结

1. Django 表单 vs WTForms

特性
WTForms(Flask)
Django Form
安装
pip install flask-wtf
自带,无需安装
定义方式
FlaskForm 类
Form 类 / ModelForm
CSRF
form.hidden_tag(){% csrf_token %}
ModelForm
无(需手动)
ModelForm 自动生成表单
模板渲染
{{ form.username() }}{{ form.username }}

2. Form 基础

# blog/forms.py
from django import forms

class ContactForm(forms.Form):
    name = forms.CharField(
        label='姓名',
        max_length=50,
        widget=forms.TextInput(attrs={'class': 'form-control', 'placeholder': '请输入姓名'})
    )
    email = forms.EmailField(
        label='邮箱',
        widget=forms.EmailInput(attrs={'class': 'form-control'})
    )
    message = forms.CharField(
        label='留言',
        widget=forms.Textarea(attrs={'class': 'form-control', 'rows': 5})
    )
# views.py
def contact(request):
    if request.method == 'POST':
        form = ContactForm(request.POST)
        if form.is_valid():
            # form.cleaned_data 是验证后的数据字典
            name = form.cleaned_data['name']
            email = form.cleaned_data['email']
            message = form.cleaned_data['message']
            # 发送邮件或保存数据库...
            return redirect('main:thanks')
    else:
        form = ContactForm()

    return render(request, 'contact.html', {'form': form})
<!-- contact.html -->
<form method="POST">
    {% csrf_token %}

    {% for field in form %}
    <div class="form-group">
        {{ field.label_tag }}
        {{ field }}
        {% if field.errors %}
            <span class="error">{{ field.errors.0 }}</span>
        {% endif %}
        {% if field.help_text %}
            <small class="help">{{ field.help_text }}</small>
        {% endif %}
    </div>
    {% endfor %}

    <button type="submit">提交</button>
</form>

3. ModelForm(重点)

ModelForm 是 Django 最强大的功能之一——直接从模型自动生成表单。

# blog/forms.py
from django.forms import ModelForm
from .models import Post, Comment

class PostForm(ModelForm):
    class Meta:
        model = Post
        fields = ['title', 'content', 'category', 'status']  # 包含哪些字段
        # fields = '__all__'  # 所有字段(不推荐)
        # exclude = ['author', 'views']  # 排除哪些字段

        widgets = {
            'title': forms.TextInput(attrs={
                'class': 'form-control',
                'placeholder': '请输入标题'
            }),
            'content': forms.Textarea(attrs={
                'class': 'form-control',
                'rows': 15
            }),
            'status': forms.Select(attrs={'class': 'form-control'}),
        }

        labels = {
            'title': '文章标题',
            'content': '文章内容',
            'category': '分类',
            'status': '状态',
        }

        help_texts = {
            'title': '5-200 个字符',
        }

class CommentForm(ModelForm):
    class Meta:
        model = Comment
        fields = ['content']
        widgets = {
            'content': forms.Textarea(attrs={
                'class': 'form-control',
                'rows': 3,
                'placeholder': '写下你的评论...'
            }),
        }

🔧 ModelForm 的核心方法

# views.py
@login_required
def post_create(request):
    if request.method == 'POST':
        form = PostForm(request.POST)
        if form.is_valid():
            post = form.save(commit=False)  # 不立即保存(可以修改)
            post.author = request.user       # 设置作者
            post.save()                      # 真正保存
            form.save_m2m()                  # 保存多对多关系
            return redirect('blog:post_detail', pk=post.pk)
    else:
        form = PostForm()

    return render(request, 'blog/post_create.html', {'form': form})

@login_required
def post_edit(request, pk):
    post = get_object_or_404(Post, pk=pk, author=request.user)

    if request.method == 'POST':
        form = PostForm(request.POST, instance=post)  # instance=编辑已有对象
        if form.is_valid():
            form.save()
            return redirect('blog:post_detail', pk=post.pk)
    else:
        form = PostForm(instance=post)  # 预填充现有数据

    return render(request, 'blog/post_edit.html', {'form': form})

💡 ModelForm 的魔力:

• 自动生成表单字段(字段类型、验证规则全部来自模型)
• form.save() 直接保存到数据库
• form.save(commit=False) 先不保存,可以修改后手动保存
• instance=obj 传入已有对象 = 编辑模式
• 自动验证 unique 约束、字段长度等


4. 表单在模板中渲染

{# 方式1:逐个字段渲染(完全控制) #}
<form method="POST">
    {% csrf_token %}

    <div class="form-group">
        <label>{{ form.title.label }}</label>
        {{ form.title }}
        {% for error in form.title.errors %}
            <span class="error">{{ error }}</span>
        {% endfor %}
    </div>

    <div class="form-group">
        <label>{{ form.content.label }}</label>
        {{ form.content }}
    </div>

    <button type="submit">提交</button>
</form>

{# 方式2:用 as_p/as_ul/as_table 快速渲染 #}
<form method="POST">
    {% csrf_token %}
    {{ form.as_p }}          {# 每个字段包在 <p> 中 #}
    {# {{ form.as_ul }}      每个字段包在 <li> 中 #}
    {# {{ form.as_table }}   每个字段包在 <tr> 中 #}
    <button type="submit">提交</button>
</form>

{# 方式3:循环渲染 #}
<form method="POST">
    {% csrf_token %}
    {% for field in form %}
    <div class="form-group {% if field.errors %}has-error{% endif %}">
        {{ field.label_tag }}
        {{ field }}
        {% for error in field.errors %}
            <div class="error-text">{{ error }}</div>
        {% endfor %}
    </div>
    {% endfor %}
    <button type="submit">提交</button>
</form>

{# 非字段错误(如验证器的全局错误) #}
{% if form.non_field_errors %}
    {% for error in form.non_field_errors %}
        <div class="alert alert-danger">{{ error }}</div>
    {% endfor %}
{% endif %}

5. 文件上传

# forms.py
class AvatarForm(forms.Form):
    avatar = forms.ImageField(label='头像')

# views.py
@login_required
def upload_avatar(request):
    if request.method == 'POST':
        form = AvatarForm(request.POST, request.FILES)  # 注意:request.FILES
        if form.is_valid():
            avatar = form.cleaned_data['avatar']
            # 保存文件
            import os
            from django.conf import settings
            path = os.path.join(settings.MEDIA_ROOT, f'avatars/{request.user.id}.jpg')
            with open(path, 'wb+') as f:
                for chunk in avatar.chunks():
                    f.write(chunk)
            return redirect('main:profile')
    else:
        form = AvatarForm()
    return render(request, 'upload_avatar.html', {'form': form})
{# 模板中(必须加 enctype) #}
<form method="POST" enctype="multipart/form-data">
    {% csrf_token %}
    {{ form.as_p }}
    <button type="submit">上传</button>
</form>

{# settings.py 媒体文件配置 #}
MEDIA_URL = '/media/'
MEDIA_ROOT = BASE_DIR / 'media'

{# urls.py(开发环境) #}
from django.conf import settings
from django.conf.urls.static import static
urlpatterns += static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)

6. Django 认证系统

Django 自带完整的用户认证系统——不需要 Flask-Login 这样的第三方库。

# Django 内置的 User 模型
from django.contrib.auth.models import User

# 创建用户
user = User.objects.create_user(
    username='alice',
    email='alice@example.com',
    password='secure_password'
)

# 验证密码
user.check_password('secure_password')  # True

# 修改密码
user.set_password('new_password')
user.save()

# 用户属性
user.is_authenticated   # 是否已登录
user.is_active          # 是否激活
user.is_staff           # 是否是管理员
user.is_superuser       # 是否是超级用户
user.groups.all()       # 所属用户组
user.user_permissions   # 权限列表

🔑 内置认证视图

# urls.py — Django 内置的认证 URL
from django.contrib.auth import views as auth_views

urlpatterns = [
    path('login/', auth_views.LoginView.as_view(template_name='login.html'), name='login'),
    path('logout/', auth_views.LogoutView.as_view(), name='logout'),
    path('password_change/', auth_views.PasswordChangeView.as_view(), name='password_change'),
    path('password_reset/', auth_views.PasswordResetView.as_view(), name='password_reset'),
]
# settings.py
LOGIN_URL = '/login/'              # @login_required 重定向地址
LOGIN_REDIRECT_URL = '/'           # 登录成功后重定向
LOGOUT_REDIRECT_URL = '/'          # 登出后重定向

7. 自定义注册/登录

# forms.py
from django.contrib.auth.forms import UserCreationForm

class RegistrationForm(UserCreationForm):
    email = forms.EmailField(required=True)

    class Meta:
        model = User
        fields = ['username', 'email', 'password1', 'password2']
        widgets = {
            'username': forms.TextInput(attrs={'class': 'form-control'}),
            'email': forms.EmailInput(attrs={'class': 'form-control'}),
        }

# views.py
from django.contrib.auth import login, authenticate

def register(request):
    if request.method == 'POST':
        form = RegistrationForm(request.POST)
        if form.is_valid():
            user = form.save()
            login(request, user)  # 注册后自动登录
            return redirect('main:index')
    else:
        form = RegistrationForm()
    return render(request, 'register.html', {'form': form})

def user_login(request):
    if request.method == 'POST':
        username = request.POST.get('username')
        password = request.POST.get('password')
        user = authenticate(request, username=username, password=password)
        if user is not None:
            login(request, user)
            return redirect(request.GET.get('next', 'main:index'))
        else:
            return render(request, 'login.html', {'error': '用户名或密码错误'})
    return render(request, 'login.html')

8. 权限控制

🔐 装饰器方式

from django.contrib.auth.decorators import login_required, permission_required

@login_required  # 必须登录
def profile(request):
    return render(request, 'profile.html')

@permission_required('blog.add_post', raise_exception=True)  # 必须有权限
def create_post(request):
    pass

🏷️ Mixin 方式(CBV)

from django.contrib.auth.mixins import LoginRequiredMixin, PermissionRequiredMixin

class PostCreateView(LoginRequiredMixin, CreateView):
    model = Post
    fields = ['title', 'content']

class PostDeleteView(LoginRequiredMixin, PermissionRequiredMixin, DeleteView):
    model = Post
    permission_required = 'blog.delete_post'
    success_url = '/'

# 自定义 Mixin
class AuthorRequiredMixin:
    """只允许作者操作"""
    def get_queryset(self):
        return super().get_queryset().filter(author=self.request.user)

👑 模板中的权限判断

{% if user.is_authenticated %}
    <p>欢迎,{{ user.username }}</p>

    {% if user.is_staff %}
        <a href="/admin/">管理后台</a>
    {% endif %}

    {% if perms.blog.add_post %}
        <a href="{% url 'blog:post_create' %}">写文章</a>
    {% endif %}

    {% if perms.blog.delete_post %}
        <button>删除</button>
    {% endif %}
{% endif %}

9. 今日练习

🏋️ 练习 1:注册表单

# 基于 UserCreationForm 创建自定义注册表单:
# - 用户名(必填,3-20 字符)
# - 邮箱(必填,唯一)
# - 密码 + 确认密码
# 注册后自动登录并跳转首页

🏋️ 练习 2:文章 ModelForm

# 创建 PostForm:
# - 只暴露 title、content、category、status 字段
# - 自定义 widget 和 label
# - 实现创建和编辑视图
# - 编辑时只能操作自己的文章

🏋️ 练习 3:权限管理

# 实现以下权限控制:
# - 未登录用户:只能看文章列表和详情
# - 登录用户:可以发表文章和评论
# - 作者:可以编辑/删除自己的文章
# - 管理员:可以编辑/删除所有文章

10. 今日小结

知识点
核心内容
Django Form
手动定义字段,适合非模型表单
ModelForm
从模型自动生成,save() 直接入库,核心武器
表单验证
is_valid() + cleaned_data + 错误处理
文件上传
request.FILES + ImageField + enctype
认证系统
User 模型 + authenticate + login/logout
注册
UserCreationForm + 继承扩展
权限控制
@login_required + @permission_required + Mixin

🚀 明日预告:Day 64 — Django REST Framework

Django 模板渲染的传统 Web 开发就绪了。但现代开发中,前端(React/Vue)和后端是分离的——后端只提供 API。明天学 Django REST Framework(DRF),让你用 Django 构建专业的 RESTful API!

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  1. CONNECT:[ UseTime:0.001154s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001775s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000671s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000680s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001369s ]
  6. SELECT * FROM `set` [ RunTime:0.026407s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001629s ]
  8. SELECT * FROM `article` WHERE `id` = 505536 LIMIT 1 [ RunTime:0.001221s ]
  9. UPDATE `article` SET `lasttime` = 1787290626 WHERE `id` = 505536 [ RunTime:0.039957s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000485s ]
  11. SELECT * FROM `article` WHERE `id` < 505536 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000608s ]
  12. SELECT * FROM `article` WHERE `id` > 505536 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000510s ]
  13. SELECT * FROM `article` WHERE `id` < 505536 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001028s ]
  14. SELECT * FROM `article` WHERE `id` < 505536 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000738s ]
  15. SELECT * FROM `article` WHERE `id` < 505536 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.010194s ]
0.251837s