Django的：無效字面對於int（）與底座10： '編號'

Question

這是我的代碼：

** 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') 

後，當我運行，python manage.py migrate

我得到這個消息 - >ValueError: invalid literal for int() with base 10:「number'`

問題出在哪裏？

Answer 1

PositiveIntegerField不支持max_length選項。它的範圍是從0到2147483647.

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