Question

由于%s我的应用程序出错了（至少，这是我的想法），但我不知道为什么。我已经改为django代码，试图将数据传递给html模板。模板正在加载但未导入数据。该应用程序确实在本地运行，但模板没有加载数据，在服务器上我收到此错误：

Traceback (most recent call last):
  File "/base/python27_runtime/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py", line 1536, in __call__
    rv = self.handle_exception(request, response, e)
  File "/base/python27_runtime/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py", line 1530, in __call__
    rv = self.router.dispatch(request, response)
  File "/base/python27_runtime/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py", line 1278, in default_dispatcher
    return route.handler_adapter(request, response)
  File "/base/python27_runtime/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py", line 1102, in __call__
    return handler.dispatch()
  File "/base/python27_runtime/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py", line 572, in dispatch
    return self.handle_exception(e, self.app.debug)
  File "/base/python27_runtime/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py", line 570, in dispatch
    return method(*args, **kwargs)
  File "/base/data/home/apps/s~ceemee11111/1.363684484611202021/helloworld.py", line 37, in get
    for greeting in greetings:
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/ext/db/__init__.py", line 2314, in next
    return self.__model_class.from_entity(self.__iterator.next())
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/ext/db/__init__.py", line 1442, in from_entity
    return cls(None, _from_entity=entity, **entity_values)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/ext/db/__init__.py", line 974, in __init__
    prop.__set__(self, value)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/ext/db/__init__.py", line 614, in __set__
    value = self.validate(value)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/ext/db/__init__.py", line 2823, in validate
    raise BadValueError('Property %s is not multi-line' % self.name)
BadValueError: Property content is not multi-line

helloworld.py：

import cgi
import datetime
import urllib
import webapp2
import os

from google.appengine.ext import db
from google.appengine.api import users
from google.appengine.ext.webapp import template



class Greeting(db.Model):
  """Models an individual Guestbook entry with an author, content, and date."""
  author = db.StringProperty()
  content = db.StringProperty(multiline=False)
  content2 = db.StringProperty(multiline=False)
  date = db.DateTimeProperty(auto_now_add=True)


def guestbook_key(guestbook_name=None):
  """Constructs a Datastore key for a Guestbook entity with guestbook_name."""
  return db.Key.from_path('Guestbook', guestbook_name or 'default_guestbook')


class MainPage(webapp2.RequestHandler):
  def get(self):
    self.response.out.write('<html><body>')
    guestbook_name=self.request.get('guestbook_name')

    greetings = db.GqlQuery("SELECT * "
                        "FROM Greeting "
                        "WHERE ANCESTOR IS :1 "
                        "ORDER BY date DESC LIMIT 10",
                        guestbook_key(guestbook_name))

    for greeting in greetings:
      if greeting.author:
        self.response.out.write(
            '<b>%s</b> wrote:' % greeting.author)
      else:
        self.response.out.write('An anonymous person wrote:')

      self.response.out.write(template.render('myhtml.html', {'guestbook_name': guestbook_name}))

class Guestbook(webapp2.RequestHandler):
  def post(self):
    guestbook_name = self.request.get('guestbook_name')
    greeting = Greeting(parent=guestbook_key(guestbook_name))

    if users.get_current_user():
      greeting.author = users.get_current_user().nickname()

    greeting.content = self.request.get('content')
    greeting.put()
    self.redirect('/?' + urllib.urlencode({'guestbook_name': guestbook_name}))


app = webapp2.WSGIApplication([('/', MainPage),
                           ('/sign', Guestbook)],
                          debug=True)

myhtml.html：

<!DOCTYPE html>
  <html>
    <body>
      <form action="/sign?{{ guestbook_name }}" method="post">
       <div id="dataImput">
        <div><div><input type="text" name="content"</div>
        <div><div><input type="text" name="content2"</div>
      </div> 
      <script>
        document.write("<h1>This is heading</h1>");

      </script>
        <div><input type="submit" value="Sign Guestbook"></div>
      </form>
      <form>Guestbook name: <input value="{{ guestbook_name|escape }}" name="guestbook_name">
  <input type="submit" value="switch"></form>
  <hr>
</body>

Answer 1

我对谷歌应用引擎一无所知（但我知道django）。您在模型中使用的类型与模板中使用的表单类型之间似乎存在冲突：

class StringProperty(verbose_name=None, multiline=False, ...)

如果multiline为False，则该值不能包含换行符。 djangoforms库使用它来强制文本之间的差异数据模型中的字段和textarea字段，其他人可以使用它出于类似的目的。

回溯的实际错误行是：

BadValueError: Property content is not multi-line

“content”是指您的模型属性。

对我而言，表明您需要执行以下任一选项...

1）更改模型以接受从textarea表单字段传递的多行值：

class Greeting(db.Model):
...
  content = db.StringProperty(multiline=True)
  content2 = db.StringProperty(multiline=True)
...

2）或者将您的textarea表单字段更改为模板中的文本字段：

    <div><input type="text" name="content"></div>
    <div><input type="text" name="content2"></div>

Answer 2

我不确切知道我是如何解决这个问题的，但是这个代码的工作原理就像错误一样。我发布这个作为％s错误的信息只是因为模板仍然不起作用

丹

import cgi
import datetime
import urllib
import webapp2
import os

from google.appengine.ext import db
from google.appengine.api import users
from google.appengine.ext.webapp import template

    class Greeting(db.Model):
  """Models an individual Guestbook entry with an author, content, and date."""
  author = db.StringProperty()
  content = db.StringProperty(multiline=True)
  content2 = db.StringProperty(multiline=True)
  date = db.DateTimeProperty(auto_now_add=True)


def guestbook_key(guestbook_name=None):
  """Constructs a Datastore key for a Guestbook entity with guestbook_name."""
  return db.Key.from_path('Guestbook', guestbook_name or 'default_guestbook')


class MainPage(webapp2.RequestHandler):
  def get(self):
    self.response.out.write('<html><body>')
    guestbook_name=self.request.get('guestbook_name')

    greetings = db.GqlQuery("SELECT * "
                        "FROM Greeting "
                        "WHERE ANCESTOR IS :1 "
                        "ORDER BY date DESC LIMIT 10",
                        guestbook_key(guestbook_name))

    for greeting in greetings:
      if greeting.author:
        self.response.out.write(greeting.author)

      else:
        self.response.out.write('An anonymous person wrote:')
    self.response.out.write(template.render('myhtml.html', {'guestbook_name': guestbook_name}))



class Guestbook(webapp2.RequestHandler):
  def post(self):
    guestbook_name = self.request.get('guestbook_name')
    greeting = Greeting(parent=guestbook_key(guestbook_name))

    if users.get_current_user():
      greeting.author = users.get_current_user().nickname()

    greeting.content = self.request.get('content')
    greeting.put()
    self.redirect('/?' + urllib.urlencode({'guestbook_name': guestbook_name}))


 app = webapp2.WSGIApplication([('/', MainPage),
                           ('/sign', Guestbook)],
                          debug=True)

myhtml.html代码：

<!DOCTYPE html>
  <html>
    <body>
      <form action="/sign?%s" method="post">
        <div><textarea name="content" rows="3" cols="60"></textarea></div>
        <div><input type="submit" value="Sign Guestbook"></div>
      </form>
          <script>
          document.write("<h1>This is heading</h1>");

          </script>

    </body>
  </html>

Answer 3

这是用于加载模板的代码（仅供参考）。感谢大家让我在Django / Python编码中找到了这一点。没有你就无法做到！

import cgi
import datetime
import urllib
import webapp2
import os

from google.appengine.ext import db
from google.appengine.api import users
from google.appengine.ext.webapp import template

class Greeting(db.Model):
  """Models an individual Guestbook entry with an author, content, and date."""
  author = db.StringProperty()
  content = db.StringProperty(multiline=True)
  content2 = db.StringProperty(multiline=True)
  date = db.DateTimeProperty(auto_now_add=True)


def guestbook_key(guestbook_name=None):
  """Constructs a Datastore key for a Guestbook entity with guestbook_name."""
  return db.Key.from_path('Guestbook', guestbook_name or 'default_guestbook')


class MainPage(webapp2.RequestHandler):
  def get(self):
    guestbook_name=self.request.get('guestbook_name')
    greetings_query = Greeting.all().ancestor(
        guestbook_key(guestbook_name)).order('-date')
    greetings = greetings_query.fetch(3)

    if users.get_current_user():
        url = users.create_logout_url(self.request.uri)
        url_linktext = 'Logout'
    else:
        url = users.create_login_url(self.request.uri)
        url_linktext = 'Login'

    template_values = {
        'greetings': greetings,
        'url': url,
        'url_linktext': url_linktext,
    }

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


class Guestbook(webapp2.RequestHandler):
  def post(self):
    guestbook_name = self.request.get('guestbook_name')
    greeting = Greeting(parent=guestbook_key(guestbook_name))

    if users.get_current_user():
      greeting.author = users.get_current_user().nickname()

    greeting.content = self.request.get('content')
    greeting.put()
    self.redirect('/?' + urllib.urlencode({'guestbook_name': guestbook_name}))


app = webapp2.WSGIApplication([('/', MainPage),
                           ('/sign', Guestbook)],
                          debug=True)

和index.html代码：

  <html>
    <body>
        {% for greeting in greetings %}
          {% if greeting.author %}
        <b>{{ greeting.author }}</b> wrote:
      {% else %}
        An anonymous person wrote:
      {% endif %}
      <blockquote>{{ greeting.content|escape }}</blockquote>
    {% endfor %}

<form action="/sign" method="post">
  <div><textarea name="content" rows="3" cols="60"></textarea></div>
  <div><input type="submit" value="Sign Guestbook"></div>
</form>

<a href="{{ url }}">{{ url_linktext }}</a>


</body>

Answer 4

我有同样的问题，改变这些行：

content = db.TextProperty()
content2 = db.TextProperty()

对于那些：

{{1}}

错误属性％s不是多行的

4 个答案: