Python django禁止直接分配到多对多集合的前端.使用user.set()

你看到这个错误的原因是， 不仅displays，而且user字段也具有多对多的关系.

在保存[Display_Data]之前，不能将[Display_Data]与[用户]相关联.

100

因此，就像您关联displays个模型实例一样，您应该在创建并保存display_data个模型实例之后关联user个实例.

您的models.py:

class Display(models.Model) :
     url=models.URLField(unique=True)
     text = models.CharField(max_length=150) 

class Display_Data(models.Model) :
         displays = models.ManyToManyField(Display)  
         users = models.ManyToManyField(User)
         choosenum = models.IntegerField()
         puplish_date = models.DateTimeField(default=datetime.now) 

since m2m field 100 is plural, I made 101 field plural as well for consistency

您的views.py:

def submit_operation(request):
 if request.method == 'POST':
    url = request.POST.get('url')
    text = request.POST.get('title')
    choosenum = request.POST.get('CHOOSE')

    try:
        choosenum = int(choosenum)
    except e:
       raise ValueError("couldn't convert choosenum into int")
       # or you can handle the error in a way you like

    if Display.objects.filter(url=url).exists():
        display = Display.objects.get(url=url)
        display_data = Display_Data.objects.create(choosenum=choosenum, date_published=datetime.now())
        display_data.displays.add(display)
        display_data.users.add(request.user)
    else:
        display = Display.objects.create(url=url, text=text)
        display_data = Display_Data.objects.create(choosenum=choosenum, date_published=datetime.now())
        display_data.displays.add(display)        # ... (إعادة توجيه المستخدم)
        display_data.users.add(request.user)

    #return redirect('searchpage') 
    return redirect(request.META.get('HTTP_REFERER'))ype herea

所以:

在您的models.py上，您已经将choosenum定义为整数字段:

choosenum = models.IntegerField()

但是request.POST中的所有数据都是字符串，所以你应该把它转换成整数:

choosenum = request.POST.get('CHOOSE')

try:
    choosenum = int(choosenum)
except e:
    raise ValueError("couldn't convert choosenum into int")
    # or you can handle the error in a way you like