Python 使用多种表单在Django中保存许多字段

我尝试在三个表格中同时处理以下内容： 1.将主题行保存为电子邮件（此操作有效） 2.保存电子邮件内容。（本工程） 3.保存电子邮件标题（有效），并保存与主题行和电子邮件内容的关系（无效）

我已经通读了每一页我能读到的与错误有关的内容。我尝试过各种不同的方法，但都不适合我

View.py：

def email_subject_create_view(request):
    if request.method == 'POST':
        email_subject_form = EmailSubjectForm(request.POST)
        email_content_form = EmailContentForm(request.POST)
        email_form = EmailForm(request.POST)
        if email_subject_form.is_valid() and email_content_form.is_valid() and email_form.is_valid() :
            subject = email_subject_form.save(commit=False)
            subject.time_created = datetime.datetime.now()
            contractor = Contractor.objects.get(user_id=request.user.id)
            subject.save()
            email_subject_form.save_m2m()

            content = email_content_form.save(commit=False)
            content.time_created = datetime.datetime.now()
            content.save()
            email_content_form.save_m2m()

            email = email_form.save(commit=False)
            email.time_created = datetime.datetime.now()

            # this is what I want to do. email.email_core_contents is a M2M field
            email.email_subject_lines = subject.id


            email.save()

context = {
        'email_subject_form': EmailSubjectForm(),
        'email_content_form': EmailContentForm(),
        'email_form': EmailForm(),
}
return render(request, 'advertise/email_subject_create.html', context)

我试过：

email.email_subject_lines = EmailSubject.objects.get(pk=subject.id)
email.email_subject_lines.set(subject)
email.email_subject_lines.set(pk=subject.id)

我也尝试过在没有

.save_m2m（）

部分代码的情况下使用它

编辑：

主示例中的错误：

Direct assignment to the forward side of a many-to-many set is prohibited. Use email_subject_lines.set() instead.

3组中的1组出现错误：

Direct assignment to the forward side of a many-to-many set is prohibited. Use email_subject_lines.set() instead.

"<Email: sfeaesfe>" needs to have a value for field "id" before this many-to-many relationship can be used.

"<Email: graegre>" needs to have a value for field "id" before this many-to-many relationship can be used.

3组中的2组出现错误：

Direct assignment to the forward side of a many-to-many set is prohibited. Use email_subject_lines.set() instead.

"<Email: sfeaesfe>" needs to have a value for field "id" before this many-to-many relationship can be used.

"<Email: graegre>" needs to have a value for field "id" before this many-to-many relationship can be used.

“”需要为字段“id”设置一个值才能使用此多对多关系。

3组中的3组出现错误：

Direct assignment to the forward side of a many-to-many set is prohibited. Use email_subject_lines.set() instead.

"<Email: sfeaesfe>" needs to have a value for field "id" before this many-to-many relationship can be used.

"<Email: graegre>" needs to have a value for field "id" before this many-to-many relationship can be used.

“”需要为字段“id”设置一个值才能使用此多对多关系。

找到了两种解决方案。这里有它们，以防将来有人遇到同样的问题

1：使用add方法。 2.再次从数据库中获取这两个对象（电子邮件和电子邮件主题）。

---

不知道为什么它会以第二种方式工作，但不是最初的方式。请注意，我必须在第二个表达式中使用

filter

而不是

get

。

当您尝试这些表达式时，到底发生了什么？添加了错误消息。确定。那么错误2和错误3还有什么不清楚的地方呢？我假设这意味着我需要在最后一个表达式之前调用

email.save（）

，以分配m2m字段。但我试过了，但没用。再说一次，没用怎么办？这正是解决办法。