使用ManyToMany关系的Django用户模型，如何使用关系更新/创建新的配置文件？

from django.db import models
from django.contrib.auth.models import User

class Profile(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    configurations = models.ManyToManyField('Configuration')

class Configuration(models.Model):
    name = models.CharField(max_length=100)
    # 其他配置属性...

from django.shortcuts import render, get_object_or_404
from .models import Profile, Configuration

def update_configurations(request, profile_id):
    profile = get_object_or_404(Profile, pk=profile_id)

    if request.method == 'POST':
        # 获取用户提交的配置文件数据
        configuration_ids = request.POST.getlist('configurations')

        # 清空用户的配置文件关系
        profile.configurations.clear()

        # 添加用户选择的配置文件关系
        for configuration_id in configuration_ids:
            configuration = get_object_or_404(Configuration, pk=configuration_id)
            profile.configurations.add(configuration)

        # 保存用户配置文件关系的更改
        profile.save()

        # 返回更新成功的页面或重定向到其他页面
        return render(request, 'success.html')

    else:
        # 获取所有配置文件
        configurations = Configuration.objects.all()

        # 渲染模板并传递配置文件和用户的配置文件关系
        return render(request, 'update_configurations.html', {'configurations': configurations, 'profile': profile})

<form method="POST" action="{% url 'update_configurations' profile.id %}">
    {% csrf_token %}
    <h3>选择配置文件：</h3>
    {% for configuration in configurations %}
        <input type="checkbox" name="configurations" value="{{ configuration.id }}"
               {% if configuration in profile.configurations.all %}checked{% endif %}>
        <label>{{ configuration.name }}</label><br>
    {% endfor %}
    <br>
    <input type="submit" value="更新配置文件">
</form>