如何跟踪哪个用户正在为模型创建对象以及如何在 Django 中仅向该用户显示对象详细信息

Question

我正在 Django 中做一个在线 classroom 项目，我在其中创建了一个名为 create_course 的模型，教师可以访问该模型。现在我正在尝试将其设计为创建 class 的老师，只有他在登录后才能看到这个，另一位老师不应该看到他的 classes 以及如何将学生添加到那个特定的 class 我创造了

课程模型

class course(models.Model):
    course_name = models.CharField(max_length=200)
    course_id = models.CharField(max_length=10)
    course_sec = models.IntegerField()
    classroom_id = models.CharField(max_length=50,unique=True)
    created_by = models.ForeignKey(User,on_delete=models.CASCADE)

在这里，如果我在表单中使用“created_by”字段，它似乎是一个下拉菜单，每个用户都在其中显示，但我想自动保存创建对象的用户

views.py

def teacher_view(request, *args, **kwargs):
    form = add_course(request.POST or None)
    context = {}
    if form.is_valid():
        form.save()
        return HttpResponse("Class Created Sucessfully")
    context['add_courses'] = form
    return render(request, 'teacherview.html', context)

forms.py

from django import forms
from .models import course

class add_course(forms.ModelForm):
    class Meta:
        model = course
        fields = ('course_name', 'course_id', 'course_sec', 'classroom_id')

Answer 1

在您看来，使用 commit=False 停止保存表单，直到您添加 created_by 字段。

def teacher_view(request, *args, **kwargs):
    form = add_course(request.POST or None)
    context = {}
    if form.is_valid():
        course = form.save(commit=False)
        course.created_by = request.user
        course.save()
        return HttpResponse("Class Created Sucessfully")
    context['add_courses'] = form
    return render(request, 'teacherview.html', context)

Answer 2

可以将登录用户注入form中的.instance的.created_by，所以：

from django.contrib.auth.decorators import login_required
from django.shortcuts import redirect

@login_required
def teacher_view(request, *args, **kwargs):
    if request.method == 'POST':
        form = add_course(request.POST, request.FILES)
        if form.is_valid():
            form<strong>.instance.created_by = request.user</strong>
            form.save()
            return redirect(<em>'name-of-some-view'</em>)
    else:
        form = add_course()
    return render(request, 'teacherview.html', {'add_courses': form})

Note: It is normally better to make use of the settings.AUTH_USER_MODEL ^[Django-doc] to refer to the user model, than to use the User model ^[Django-doc] directly. For more information you can see the referencing the User model section of the documentation.

Note: You can limit views to a view to authenticated users with the @login_required decorator ^[Django-doc].

Note: Usually a Form or a ModelForm ends with a …Form suffix, to avoid collisions with the name of the model, and to make it clear that we are working with a form. Therefore it might be better to use CourseForm instead of ~~add_course~~.

Note: Models in Django are written in PascalCase, not snake_case, so you might want to rename the model from ~~course~~ to Course.

Note: In case of a successful POST request, you should make a redirect ^[Django-doc] to implement the Post/Redirect/Get pattern ^[wiki]. This avoids that you make the same POST request when the user refreshes the browser.

如何跟踪哪个用户正在为模型创建对象以及如何在 Django 中仅向该用户显示对象详细信息

How to track which user is creating object for a model and how to show the object details only to that user in django

python

django

django-models

django-views

django-templates