带有 OnetoOne 字段的 Django CreateView/UpdateView 取决于记录是否存在

Question

我正在尝试构建一个个人资料页面，其中 User 可以填写 Teacher 模型。

我的老师模型，model.py

class Teacher(models.Model):
    user = models.OneToOneField(User, on_delete=models.PROTECT, related_name='Teacher')
    rate = models.CharField(max_length=200)
    availability = models.BooleanField(default=False)

表单.py

class TeacherCreate(CreateView):
    user_id = request.user.id #INCORRECT! Needs something to remember current user id.
    model = Teacher
    fields = ['rate','availability']

编辑:我也尝试添加:

def form_valid(self, form):
    form.instance.user = self.request.user
    return super(TeacherCreate, self).form_valid(form)

as suggested here.

我们不允许用户在此创建 View 中更改其 ID。事实上，我认为这应该是当前用户的 id，user_id 由 request.user.id 给出。

teacher_form.html

    <form action="" method="post" enctype="multipart/form-data">
{% csrf_token %}
    {% for field in form %}
<div class="form-group">
    <span color="red">{{ field.errors }}</span>
    <label>
        {{ field.label_tag }}
    </label>
    <div>{{ field }}</div>
</div>
{%  endfor %}
     <button type="submit">Submit</button>
    </form>

现在的问题是，当我运行它时，出现错误:

NOT NULL constraint failed: users_teacher.user_id

我认为这是因为我没有指定 user_id。

我希望它如何工作:

首先，检查老师是否已经在数据库中有记录。例如。如果在 Teacher 表中有一行，user_id=当前用户。

如果老师有个人资料 -> 调用更新 View 。

如果教师没有个人资料 -> 使用创建 View 。

Answer 1

尝试将 LoginRequiredMixin 添加到您的 View ，如果我理解，简单的创建或更新 View :

from django.contrib.auth.mixins import LoginRequiredMixin
from django.http import HttpResponseRedirect
from django.views.generic import CreateView


class TeacherCreate(LoginRequiredMixin, CreateView):
    model = Teacher
    fields = ['rate','availability']

    def get_success_url(self):
        # replace url name 'users' on your if need
        return reverse('users',args=(self.request.user.id,))

    def form_valid(self, form):
        user = self.request.user
        instance, _ = Teacher.objects.get_or_create(user=user)
        instance.rate = form.cleaned_data.get("rate", "")
        instance.availability = form.cleaned_data.get("availability", "")
        instance.save()
        # modify return
        return HttpResponseRedirect(self.get_success_url())