def post(self, request):
ID = request.POST.get("id", "")
type = request.POST.get("type", "")
if int(type) > 0:
#添加课程
#此处类似于 读者－写者 模型
#添加行级锁，防止改动课程时用户进入读取错误信息
with transaction.atomic():
if ID:
lesson = Lesson.objects.select_for_update().get(id=ID)
else:
lesson = Lesson()
lesson.course_id = request.POST.get("cId", "")
lesson.name = request.POST.get("name", "")
lesson.save()
video = Video()
video.lesson_id = lesson.id
video.name = lesson.name
video.url = request.POST.get("url", "")
video.save()
else:
#进行事务处理,保证课程发布可以通知到每个关注者
with transaction.atomic():
if ID:
course = Course.objects.select_for_update().get(id=ID)
else:
course = Course()
teacher = Teacher.objects.get(id=request.user.teacher_id)
course.name = request.POST.get("name", "")
course.tag = request.POST.get("tag", "")
course.desc = request.POST.get("desc", "")
course.detail = request.POST.get("detail", "")
course.degree = request.POST.get("degree", "")
course.learn_times = request.POST.get("learn_times", "")
course.teacher = teacher
course.save()
teacher_id = teacher.id
users = UserFavorite.objects.filter(fav_id=teacher_id, fav_type=1)
if ID:
for user in users:
sendMsg(user.user_id,
teacher.name + "修改了课程:" + course.name, teacher.id)
else:
for user in users:
sendMsg(user.user_id,
teacher.name + "发布了新课程:" + course.name, teacher.id)
return render(request, 'usercenter-publish-course.html', {})
def handle(self, *args, **kwargs):
count = int(input(f'Courses count(max={len(self.courses_name)}): '))
course_list = Course.objects.all()
teacher_list = Teacher.objects.all()
while count >= 0:
name = self.courses_name[randint(0, len(self.courses_name) - 1)]
if (not Course.objects.filter(name=name).exists()):
self.stdout.write(
self.style.SUCCESS(f'Creating \'{name}\' course..'))
course = Course()
course.name = name
course.detail = f'Learning {name} in short period and become a developer'
# thum = self.get_thumbnail(name)
# course.tumbnail = ImageFile(open(thum, "rb"))
course.teacher = teacher_list[randint(0,
teacher_list.count() -
1)]
course.save()
self.stdout.write(self.style.SUCCESS(f'\'{name}\' created/'))
count -= 1
