使用django non-rel时未保存对象

Question

我的models.py：

class Projects(models.Model):
    projectName =models.CharField(max_length = 100,unique=True,db_index=True)
    projectManager = models.ForeignKey('Users')

class Users(models.Model):
    name = models.CharField(max_length = 100,unique=True)
    designation = models.CharField(max_length =100 )
    team = ListField(models.CharField(max_length =100),null=True)

现在，我正在尝试使用shell中的以下代码创建一个项目类对象：

user_object = Users.objects.get(name="abc")

p = Projects(projectName="xyz",projectManager = user_object)
p.save()

在p.save()上，它给出了错误：

Traceback (most recent call last):
File "<console>", line 1, in <module>
File "/home/aprainfo/env/lib/python2.5/site-packages/Django-1.3.1-py2.5.egg/django/db/models/base.py", line 460, in save
    self.save_base(using=using, force_insert=force_insert, force_update=force_update)
File "/home/aprainfo/env/lib/python2.5/site-packages/Django-1.3.1-py2.5.egg/django/db/models/base.py", line 543, in save_base
    for f in meta.local_fields if not isinstance(f, AutoField)]
File "/home/aprainfo/env/lib/python2.5/site-packages/Django-1.3.1-py2.5.egg/django/db/models/fields/subclassing.py", line 28, in inner
    return func(*args, **kwargs)
File "/home/aprainfo/env/lib/python2.5/site-packages/Django-1.3.1-py2.5.egg/django/db/models/fields/related.py", line 876, in get_db_prep_save
    connection=connection)
File "/home/aprainfo/env/lib/python2.5/site-packages/Django-1.3.1-py2.5.egg/django/db/models/fields/subclassing.py", line 28, in inner
    return func(*args, **kwargs)
File "/home/aprainfo/env/lib/python2.5/site-packages/Django-1.3.1-py2.5.egg/django/db/models/fields/subclassing.py", line 28, in inner
    return func(*args, **kwargs)
File "/home/aprainfo/env/lib/python2.5/site-packages/Django-1.3.1-py2.5.egg/django/db/models/fields/__init__.py", line 276, in get_db_prep_save
    return self.get_db_prep_value(value, connection=connection, prepared=False)
File "/home/aprainfo/env/lib/python2.5/site-packages/Django-1.3.1-py2.5.egg/django/db/models/fields/subclassing.py", line 53, in inner
    return func(*args, **kwargs)
File "/home/aprainfo/env/lib/python2.5/site-packages/Django-1.3.1-py2.5.egg/django/db/models/fields/subclassing.py", line 53, in inner
    return func(*args, **kwargs)
File "/home/aprainfo/env/lib/python2.5/site-packages/Django-1.3.1-py2.5.egg/django/db/models/fields/__init__.py", line 271, in get_db_prep_value
    value = self.get_prep_value(value)
File "/home/aprainfo/env/lib/python2.5/site-packages/Django-1.3.1-py2.5.egg/django/db/models/fields/__init__.py", line 479, in get_prep_value
    return int(value) ValueError: invalid literal for int() with base 10: '4f1116115fcff377b2000001'

我不知道为什么要在最后一行将字符串转换为int。我不知道如何摆脱这个错误？

Answer 1

您的问题很可能与django非rel和mongodb-engine的安装有关。标准django要求所有id都是整数，而组成django non-rel的包套件将其更改为允许mongodb使用基于字符串的id。

我建议您按照http://django-mongodb.org/topics/setup.html上定义的顺序重新安装安装程序

我遇到了同样的问题，这是一个安装问题，可能是使用标准的django而不是非版本的django。

我的pip requirements.txt包含以下条目：

git+git://github.com/django-nonrel/mongodb-engine.git@master
git+git://github.com/django-nonrel/django-nonrel.git@master
git+git://github.com/django-nonrel/django-permission-backend-nonrel.git@master

然后我就可以做了：pip install -U -r requirements.txt