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我在 Django 中编写博客应用程序时遇到了麻烦。

首先，我的models.py：

class Blog(models.Model):
    user = models.ForeignKey(User)
    blog_title = models.TextField()
    def __unicode__(self):
        return self.blog_title

class PostManager(models.Manager):
    def create_post(self, blog):
        post = self.create(blog=blog)
        return post

class Post(models.Model):
    blog = models.ForeignKey(Blog)
    post_title = models.TextField()
    post_content = models.TextField()
    objects = PostManager()
    def __unicode__(self):
        return self.post_title

然后是 views.py 文件中导致错误的行：

user = request.user
blog = Blog.objects.get_or_create(
    user=user
)
post = Post.objects.create_post(blog)

此行导致错误：

Cannot assign "(<Blog: title1>, False)": "Post.blog" must be a "Blog" instance.

Request Method:     POST
Request URL:    http://localhost:7777/save/
Django Version:     1.5.1
Exception Type:     ValueError
Exception Value:    

Cannot assign "(<Blog: title1>, False)": "Post.blog" must be a "Blog" instance.

Exception Location:     /Library/Python/2.7/site-packages/django/db/models/fields/related.py in __set__, line 405
Python Executable:  /usr/bin/python
Python Version:     2.7.2
Python Path:    

['/Users/yoongeemin/Documents/Django/project_blog',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python27.zip',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-old',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/PyObjC',
 '/Library/Python/2.7/site-packages']

我已经尝试解决这个问题几个小时，但我不知道错误意味着什么以及导致问题的原因。任何建议:(??谢谢！

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