Question

我正在使用python，django和谷歌应用引擎，我收到以下错误。但是，bookdescription是TextProperty而不是StringProperty，所以我不明白为什么会发生多行错误。

错误是间歇性的，有时页面会呈现正常，有时则不会。我是编码的新手，所以非常感谢任何和所有的帮助！

模型定义如下所示：

class Book(db.Model):
    list = db.ReferenceProperty(List)
    booktitle = db.StringProperty()
    bookauthor = db.StringProperty()
    bookdescription = db.TextProperty()
    added = db.DateTimeProperty(auto_now_add=True)

完整错误：

Property bookdescription is not multi-line 
Traceback (most recent call last): 
  File "/base/python_runtime/python_lib/versions/1/google/appengine/ 
ext/webapp/__init__.py", line 511, in __call__ 
    handler.get(*groups) 
  File "/base/data/home/apps/7-books/3.345967110627358311/7books.py", 
line 279, in get 
    self.response.out.write(template.render(path, template_values)) 
  File "/base/python_runtime/python_lib/versions/1/google/appengine/ 
ext/webapp/template.py", line 81, in render 
    return t.render(Context(template_dict)) 
  File "/base/python_runtime/python_lib/versions/1/google/appengine/ 
ext/webapp/template.py", line 121, in wrap_render 
    return orig_render(context) 
  File "/base/python_runtime/python_lib/versions/third_party/ 
django-0.96/django/template/__init__.py", line 168, in render 
    return self.nodelist.render(context) 
  File "/base/python_runtime/python_lib/versions/third_party/ 
django-0.96/django/template/__init__.py", line 705, in render 
    bits.append(self.render_node(node, context)) 
  File "/base/python_runtime/python_lib/versions/third_party/ 
django-0.96/django/template/__init__.py", line 718, in render_node 
    return(node.render(context)) 
  File "/base/python_runtime/python_lib/versions/third_party/ 
django-0.96/django/template/loader_tags.py", line 82, in render 
    return compiled_parent.render(context) 
  File "/base/python_runtime/python_lib/versions/third_party/ 
django-0.96/django/template/__init__.py", line 168, in render 
    return self.nodelist.render(context) 
  File "/base/python_runtime/python_lib/versions/third_party/ 
django-0.96/django/template/__init__.py", line 705, in render 
    bits.append(self.render_node(node, context)) 
  File "/base/python_runtime/python_lib/versions/third_party/ 
django-0.96/django/template/__init__.py", line 718, in render_node 
    return(node.render(context)) 
  File "/base/python_runtime/python_lib/versions/third_party/ 
django-0.96/django/template/loader_tags.py", line 23, in render 
    result = self.nodelist.render(context) 
  File "/base/python_runtime/python_lib/versions/third_party/ 
django-0.96/django/template/__init__.py", line 705, in render 
    bits.append(self.render_node(node, context)) 
  File "/base/python_runtime/python_lib/versions/third_party/ 
django-0.96/django/template/__init__.py", line 718, in render_node 
    return(node.render(context)) 
  File "/base/python_runtime/python_lib/versions/third_party/ 
django-0.96/django/template/defaulttags.py", line 99, in render 
    values = list(values) 
  File "/base/python_runtime/python_lib/versions/1/google/appengine/ 
ext/db/__init__.py", line 2012, in next 
    return self.__model_class.from_entity(self.__iterator.next()) 
  File "/base/python_runtime/python_lib/versions/1/google/appengine/ 
ext/db/__init__.py", line 1239, in from_entity 
    instance = cls(None, _from_entity=True, **entity_values) 
  File "/base/python_runtime/python_lib/versions/1/google/appengine/ 
ext/db/__init__.py", line 813, in __init__ 
    prop.__set__(self, value) 
  File "/base/python_runtime/python_lib/versions/1/google/appengine/ 
ext/db/__init__.py", line 542, in __set__ 
    value = self.validate(value) 
  File "/base/python_runtime/python_lib/versions/1/google/appengine/ 
ext/db/__init__.py", line 2453, in validate 
    raise BadValueError('Property %s is not multi-line' % self.name) 
BadValueError: Property bookdescription is not multi-line

类看起来像这样：

class Displaylist(webapp.RequestHandler):

    def get(self, id):

        booklist = List.get_by_id(int(id))

        books = booklist.book_set

        list = booklist
        creator = booklist.user
        location = getip(self.request.remote_addr)
        tld = gettld(location)
        aff = getaff(location)

        user = users.get_current_user()

        if user:
            loginout = users.create_logout_url("/")
            username = user.email()
        else:
            loginout = users.create_login_url("/")
            username = ''

        template_values = {
            'list': list,
            'creator': creator,
            'books': books,
            'email': username,
            'loginout': loginout,
            'tld': tld,
            'aff': aff,
            }

        path = os.path.join(os.path.dirname(__file__), 'templates/list.html')
        self.response.out.write(template.render(path, template_values))

Answer 1

似乎运行时环境以某种方式引用Book模型的不同定义，其bookdescription定义为StringProperty，因为错误是从{{3}引发的}}

您是否有机会在多个地方定义Book模型？

db.TextProperty（）上的“BadValueError：属性xxxx不是多行”

1 个答案: