Django-为每个模型对象生成随机，唯一的子弹字段

Question

我有一个ExampleModel在Django中调用的模型，并且希望每个模型对象都可以唯一标识。但是，我不希望用户在URL中看到对象的ID。因此，出于这个原因，我希望对象slug是唯一的，随机生成的8位整数，该整数将进入视图URL。这与我所见过的其他问题不同，因为这意味着不会生成基于模型对象的名称//内容本身的条形字符串。

Models.py：

class ExampleModel(models.Model):
    user = models.ForeignKey(UserModel, related_name='examplemodel', on_delete=models.CASCADE, null=True)
    title = models.CharField(max_length=50, verbose_name='Title')
    slug = models.SlugField(unique=True, blank=True, null=True)

目前，Slug的值为null，因此我不必为所有当前ExampleModel对象设置默认的Slug 。

可以理解，这是很模糊的，但是我找不到适合我的实际情况的任何指南/教程。

感谢您提供的任何帮助/指导

编辑 这是我的views.py：

def model_create(request):
    user=request.user.id
    if request.user.is_authenticated:
        try:
            example = request.user.examplemodel
        except ExampleProfile.DoesNotExist:
            example = ExampleProfile(user)
        if request.method == 'POST':
            form = NewForm(request.POST, request.FILES)
            if form.is_valid():
                form.save()
                return redirect('/dashboard/')
            else:
                return render(request, 'create.html', {'form': form})
        else:
            form = NewForm()
            return render(request, 'create.html', {'form': form})
    else:
        return redirect('/users/login/?next=')

编辑2 Models.py（保存方法）：

def save(self, *args, **kwargs):
        if self.user is None:  # Set default reference
            self.user = UserModel.objects.get(id=1)
        super(ExampleModel, self).save(*args, **kwargs)

Answer 1

Django get_random_string内置了一个函数，可以生成您的子弹所需的随机字符串。

正如塞巴斯蒂安·沃兹尼（Sebastian Wozny）所述，您想在覆盖save方法时调用它。基础是：

from django.utils.crypto import get_random_string
# ...
the_slug = get_random_string(8,'0123456789') # 8 characters, only digits. 

那不是实际的工作代码。更详细的说，真实的models.py如下所示。请注意，我并不仅限于数字，我正在检查是否存在古怪，并确保它不会拼写任何坏字：

from django.db import models
from django.utils.crypto import get_random_string
# ...
class SomeModelWithSlug(models.Model):
  slug = models.SlugField(max_length=5,blank=True,) # blank if it needs to be migrated to a model that didn't already have this 
  # ...
  def save(self, *args, **kwargs):
    """ Add Slug creating/checking to save method. """
    slug_save(self) # call slug_save, listed below
    Super(SomeModelWithSlug, self).save(*args, **kwargs)
# ...
def slug_save(obj):
""" A function to generate a 5 character slug and see if it has been used and contains naughty words."""
  if not obj.slug: # if there isn't a slug
    obj.slug = get_random_string(5) # create one
    slug_is_wrong = True  
    while slug_is_wrong: # keep checking until we have a valid slug
        slug_is_wrong = False
        other_objs_with_slug = type(obj).objects.filter(slug=obj.slug)
        if len(other_objs_with_slug) > 0:
            # if any other objects have current slug
            slug_is_wrong = True
        naughty_words = list_of_swear_words_brand_names_etc
        if obj.slug in naughty_words:
            slug_is_wrong = True
        if slug_is_wrong:
            # create another slug and check it again
            obj.slug = get_random_string(5)