数据插入错误：无效的整数文字（int()，基数：10）

Question

我在Google App Engine上使用Django-nonrel。我想往数据库里添加一行数据，但在使用save()的时候遇到了这个错误：

无效的整数值，无法转换为10进制

这是我的代码：

views.py

from django import forms
from django.contrib.auth.decorators import login_required
from django.contrib.auth.forms import UserCreationForm
from django.http import HttpResponseRedirect
from django.shortcuts import render_to_response
from forms import SayForm
from models import Saying, Category
import datetime

def say_something(request):
if request.method == 'POST':
    form = SayForm(request.POST)
    if form.is_valid():
        cd = form.cleaned_data
        content = cd['content']
        category_temp = "Uncategorized"
        category = Category.objects.get(name = category_temp)
        added_date = datetime.datetime.now()
        added_user = request.user
        saying = Saying(content, category, added_date, added_user)
        saying.save()
        return HttpResponseRedirect('/contribute/success')
else:
    form = SayForm()
return render_to_response('say_form.html', {'form' : form})

models.py

from django.db import models
from django.contrib.auth.models import User

class Category(models.Model):
    name = models.CharField(max_length = 50)

    def __unicode__(self):
        return self.name

class Saying(models.Model):
    content = models.CharField(max_length = 160)
    category = models.ForeignKey(Category)
    added_date = models.DateField()
    added_user = models.ForeignKey(User)

forms.py

from django import forms

class SayForm(forms.Form):
    content = forms.CharField(widget = forms.Textarea)

    def clean_message(self):
        content = self.cleaned_data['content']
        num_characters = len(content)
        if num_characters > 160:
            raise forms.ValidationError("Please limit your saying to 160 characters only.")
        num_words = len(content.split())
        if num_words < 4:
            raise forms.ValidationError("This doesn't make sense. Say something longer.")
        return content

补充：这是错误追踪信息

追踪信息：文件 "/home/eeyorexd/workspace/Python/appengine/something-to-say/somethingtosay/django/core/handlers/base.py" 在 get_response 107. response = callback(request, *callback_args, **callback_kwargs)

文件 "/home/eeyorexd/workspace/Python/appengine/something-to-say/somethingtosay/django/contrib/auth/decorators.py" 在 _wrapped_view 25. return view_func(request, *args, **kwargs)

文件 "/home/eeyorexd/workspace/Python/appengine/something-to-say/somethingtosay/core/views.py" 在 say_something 36. saying.save()

文件 "/home/eeyorexd/workspace/Python/appengine/something-to-say/somethingtosay/django/db/models/base.py" 在 save 452. self.save_base(using=using, force_insert=force_insert, force_update=force_update)

文件 "/home/eeyorexd/workspace/Python/appengine/something-to-say/somethingtosay/django/db/models/base.py" 在 save_base 550. for f in meta.local_fields]

文件 "/home/eeyorexd/workspace/Python/appengine/something-to-say/somethingtosay/django/db/models/fields/subclassing.py" 在 inner 28. return func(*args, **kwargs)

文件 "/home/eeyorexd/workspace/Python/appengine/something-to-say/somethingtosay/django/db/models/fields/subclassing.py" 在 inner 28. return func(*args, **kwargs)

文件 "/home/eeyorexd/workspace/Python/appengine/something-to-say/somethingtosay/django/db/models/fields/init.py" 在 get_db_prep_save 280. return self.get_db_prep_value(value, connection=connection, prepared=False)

文件 "/home/eeyorexd/workspace/Python/appengine/something-to-say/somethingtosay/django/db/models/fields/subclassing.py" 在 inner 53. return func(*args, **kwargs)

文件 "/home/eeyorexd/workspace/Python/appengine/something-to-say/somethingtosay/django/db/models/fields/init.py" 在 get_db_prep_value 492. return connection.ops.value_to_db_auto(value)

文件 "/home/eeyorexd/workspace/Python/appengine/something-to-say/somethingtosay/djangotoolbox/db/base.py" 在 value_to_db_auto 68. return super(NonrelDatabaseOperations, self).value_to_db_auto(value)

文件 "/home/eeyorexd/workspace/Python/appengine/something-to-say/somethingtosay/django/db/backends/init.py" 在 value_to_db_auto 485. return int(value)

异常类型：ValueError 在 /contribute/ 异常值：无效的整数值，无法转换为10进制：'test'

我感觉问题可能出在我保存对象到数据库的方式上。也许是外键的部分？因为我最近才开始学习Django，所以还不能准确找到问题所在。这个问题和Django-nonrel使用GAE的后端有关系吗？有没有人能告诉我我哪里出错了？

整数转换错误追踪 google app engine 数据库模型外键 valueerror django-nonrel 数据插入错误

数据插入错误：无效的整数文字（int()，基数：10）

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