如何使用Python构建CMS系统的内容管理功能

# 导入Django模块
from django.db import models
from django.contrib.auth.models import User

# 定义角色模型
class Role(models.Model):
    name = models.CharField(max_length=50)

# 定义权限模型
class Permission(models.Model):
    name = models.CharField(max_length=50)

# 定义分类模型
class Category(models.Model):
    name = models.CharField(max_length=50)

# 定义内容模型
class Content(models.Model):
    title = models.CharField(max_length=100)
    content = models.TextField()
    pub_date = models.DateTimeField(auto_now_add=True)
    category = models.ForeignKey(Category, on_delete=models.CASCADE)
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    permissions = models.ManyToManyField(Permission)

# 定义用户模型
class UserProfile(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    roles = models.ManyToManyField(Role)

# 示例代码，创建新的内容
def create_content(user, title, content, category):
    # 获取当前用户
    user_profile = UserProfile.objects.get(user=user)

    # 检查用户是否有发布内容的权限
    if user_profile.roles.filter(name='publisher').exists():
        # 创建内容对象
        new_content = Content.objects.create(
            title=title,
            content=content,
            category=category,
            user=user
        )
        # 保存内容对象
        new_content.save()
        return new_content
    else:
        return None

def publish_content(request):
    # 获取请求参数
    title = request.POST['title']
    content = request.POST['content']
    category_id = request.POST['category']

    # 获取当前登录用户
    current_user = request.user

    # 获取分类对象
    category = Category.objects.get(id=category_id)

    # 调用创建内容函数
    new_content = create_content(current_user, title, content, category)

    if new_content:
        return HttpResponse('内容发布成功')
    else:
        return HttpResponse('没有权限发布内容')