cannot import name forms

from itertools import chain

from django.contrib import messages
from django.contrib.auth.decorators import login_required
from django.http import HttpResponseRedirect
from django.shortcuts import get_object_or_404, render


from . import forms
from . import models


def course_list(request):
    courses = models.Course.objects.all()
    return render(request, 'courses/course_list.html', {'courses': courses})


def course_detail(request, pk):
    course = get_object_or_404(models.Course, pk=pk)
    steps = sorted(chain(course.text_set.all(), course.quiz_set.all()),
                  key=lambda step:step.order)
    return render(request, 'courses/course_detail.html', {
        'course': course, 
        'steps':steps
      })


def text_detail(request, course_pk, step_pk):
    step = get_object_or_404(models.Text, course_id=course_pk, pk=step_pk)
    return render(request, 'courses/step_detail.html', {'step': step})


def quiz_detail(request, course_pk, step_pk):
    step = get_object_or_404(models.Quiz, course_id=course_pk, pk=step_pk)
    return render(request, 'courses/step_detail.html', {'step': step})


@login_required
def quiz_create(request, course_pk):
    course = get_object_or_404(models.Course, pk=course_pk)
    form = forms.QuizForm()

    if request.method == 'POST':
        form = forms.QuizForm(request.POST)
        if form.is_vaild():
            quiz = form.save(commit=False)
            quiz.course = course
            quiz.save()
            messages.add_message(request, messages.SUCCESS, "Quiz Added")
            return HttpResponseRedirect(quiz.get_absulte_url())#reverse안함.
    return render(request, 'courses/quiz_form.html',{'form':form, 'course':course})

from django import forms
from . import models

class QuizForm(forms.ModelForm):
    class Meta:
        model = models.Quiz
        fields = [
            'title',
            'description',
            'order',
            'total-questions',
        ]
        # exclude = ['course',      ]
class TrueFalseQuestionForm(forms.ModelForm):
    class Meta:
        model = models.TrueFalseQuesion
        fields = ['order', 'prompt']
class MultipleChoiceQuestionForm(forms.ModelForm):
    class Meta:
        model  models.MultipleChoiceQuestion
        fields = ['order', 'prompt', 'shuffle_answers']