带有Django的googleappengine按键从模板检索到vi

Question

我有一个谷歌应用引擎的小问题，我想从数据存储中检索图像，我的功能是100%工作，如果我在代码中输入键，另一方面，如果我得到一个参数，它会给我BadKeyError

这是表格

        {% for image in image.all %}
            <li>{{ image.title }}  </li>
            <img src='getImage?key={{image.key}}' height="100" />   

映射到

^{pr2}$

Answer 1

我创造了一些和你想要的相似的东西。。希望这有帮助

图像.py

import os
from google.appengine.ext import db
from google.appengine.ext import webapp
from google.appengine.ext.webapp import template
from google.appengine.ext.webapp.util import run_wsgi_app
class Profile(db.Model):
                image=db.BlobProperty()
class disp_image(webapp.RequestHandler):       
                def get(self): 
                    key = self.request.get('key')
                    image = Profile.get(key)
                    self.response.headers['Content-Type'] = "image/png"
                    return self.response.out.write(image.image)
class MainPage(webapp.RequestHandler):
    def get(self):
        image = self.request.get('image')
        pro=Profile()
        if image:   
            pro.image = db.Blob(image)
            import logging
            logging.info('persisted')
            pro.put()
        prof=Profile().all()

        return self.response.out.write(template.render('view.html',{'prof':prof}))
    def post(self):
        return MainPage.get(self)
application = webapp.WSGIApplication([
  ('/', MainPage),
  ('/disp', disp_image)
], debug=True)
def main():
  run_wsgi_app(application)
if __name__ == '__main__':
  main()

视图.html

^{pr2}$

应用程序yaml

application: sample-app
version: 1
runtime: python
api_version: 1

handlers:
- url: /.*
  script: image.py

网址

>>> req.host
'localhost:80'
>>> req.host_url
'http://localhost'
>>> req.application_url
'http://localhost/blog'
>>> req.path_url
'http://localhost/blog/article'
>>> req.url
'http://localhost/blog/article?id=1'
>>> req.path
'/blog/article'
>>> req.path_qs
'/blog/article?id=1'
>>> req.query_string
'id=1'