[英]How can I Generate 10 Unique digits in Model Form and Pass Form Context Variable in Django Class Based ListView
[英]How can I automatically generate unique 4 digits and save in Django Model
我正在 Django 中开展一个项目,其中我有一个 SubmitedApps Model,它适用于所有提交的申请。 下面是model代码:
class SubmitedApps(models.Model):
applicant = models.OneToOneField(User, on_delete=models.CASCADE, null=True)
application = models.UUIDField(primary_key = True, editable = False, default=uuid.uuid4)
confirm = models.BooleanField()
date = models.DateTimeField(auto_now_add=True)
def save(self, *args, **kwargs):
self.application == str(uuid.uuid1())
super().save(*args, **kwargs)
def __unicode__(self):
return self.applicant
def __str__(self):
return f'Application Number: {self.application} Username:{self.applicant}'
我还有一个 ModelForm,它是一个复选框,如下所示:
class ConfirmForm(forms.ModelForm):
confirm = forms.BooleanField()
class Meta:
model = SubmitedApps
fields = ['confirm']
在 views.py 中,我尝试检查申请是否已经提交,如果没有提交,则应将申请人重定向到申请打印单页,如下所示:
@login_required(login_url='user-login')
def SubmitApp(request):
try:
#Grab the logged in applicant in the submited app table
check_submited = SubmitedApps.objects.get(applicant=request.user)
#If it Does NOT Exist then submit it
except SubmitedApps.DoesNotExist:
if request.method == 'POST':
submit_form = ConfirmForm(request.POST, request.FILES)
if submit_form.is_valid():
submit_form.instance.applicant = request.user
submit_form.save()
messages.success(request, 'WASU 2022 Scholarship Application Submited Successfully')
return redirect('app-slip')
else:
submit_form = ConfirmForm()
context = {
'submit_form':submit_form,
}
return render(request, 'user/confirmation.html', context)
else:
if check_submited.application != "":
return redirect('app-slip')
我的问题是自动生成的 output 不是数字而是cb4f5e96-951e-4d99-bd66-172cd70d16a5
而我期待 4 到 6 位唯一数字。
你可以使用 UUIDField 它是自定义的,它来自 Django model 内置,
import uuid
from django.db import models
class MyUUIDModel(models.Model):
id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
# other fields
并自定义数字和从 4 到 6,您可以执行以下操作:
import uuid
str(uuid.uuid4().int)[:6]
最后代码会做:
import uuid
from django.db import models
class MyUUIDModel(models.Model):
id = models.UUIDField(primary_key=True, default=str(uuid.uuid4().int)[:6], editable=False)
# other fields
更好的想法是生成具有所需长度的加密令牌。 这也有可能发生冲突,但我想它会比截断的 UUID 少得多。
其他解决方案:使用这个库: shortuuid
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