Django: int()的文本无效，基数为10：'number‘

Question

这是我的代码：

**urls.py：**

from django.conf.urls import url, include
from base_app import views
from django.contrib.auth import views as auth_views

app_name = 'base_app'

urlpatterns = [
   url(r'^forms/$', views.form, name='form'),
   url(r'^tables/$', views.table, name='table'),
   url(r'^register/', views.register, name='register'),
   url(r'^login/$', views.user_login, name='login'),
   url(r'^logout/$', views.user_logout, name='logout'),# line added
]

**views.py：**

def form(request):
    registered = False
    if request.method == 'POST':
        user_form = FormName(data=request.POST)
        if user_form.is_valid():
            user = user_form.save()
            user.save()
            registered = True
        else:
            print(user_form.errors)
    else:
        user_form = FormName()
        return render(request, 'base_app/form-samples.html', {'user_form':user_form, 'registered':registered})

    return render(request, 'base_app/form-samples.html')

**models.py：**

class InfoForm(models.Model):

    username = models.CharField(max_length=256, default='username')
    email = models.EmailField(max_length=256, default='email')
    number = models.PositiveIntegerField(max_length=256, null=True)

    def __str__(self):
        return self.user.username

**forms.py：**

class FormName(forms.ModelForm):

    class Meta:
        model = InfoForm
        fields = ('username', 'email', 'number')

在那之后，我跑了，python manage.py migrate

我收到-> ValueError: invalid literal for int() with base 10:‘number’这条消息

问题出在哪里？

Answer 1

PositiveIntegerField不支持max_length选项。范围从0到2147483647。

from django.core.validators import MaxValueValidator
...
number = models.PositiveIntegerField(validators=[MaxValueValidator(256)])