如何使用会话在Django中创建登录系统？

SESSION_ENGINE = 'django.contrib.sessions.backends.db'

MIDDLEWARE = [
    ...
    'django.contrib.sessions.middleware.SessionMiddleware',
    ...
]

from django.contrib.auth import authenticate, login

def login_view(request):
    if request.method == 'POST':
        username = request.POST['username']
        password = request.POST['password']
        user = authenticate(request, username=username, password=password)
        if user is not None:
            login(request, user)
            # 登录成功，将用户标识存储到会话中
            request.session['user_id'] = user.id
            return redirect('home')
        else:
            # 登录失败处理
            return render(request, 'login.html', {'error': 'Invalid credentials'})
    else:
        return render(request, 'login.html')

<form method="post" action="{% url 'login' %}">
    {% csrf_token %}
    <input type="text" name="username" placeholder="Username">
    <input type="password" name="password" placeholder="Password">
    <button type="submit">Login</button>
</form>
{% if error %}
    <p>{{ error }}</p>
{% endif %}

from django.contrib.auth import logout

def logout_view(request):
    logout(request)
    # 清除会话中存储的用户标识
    request.session.clear()
    return redirect('home')