Question

我正在尝试学习blobstore API ...并且我能够成功上传文件并将其取回，但我没有任何运气尝试将上传表单与常规网络表单相结合与文件关联的额外信息，例如文件的昵称。

以下是我一直在玩的简单应用的代码。它基于谷歌提供的样本。

#!/usr/bin/env python
#

import os
import urllib

from google.appengine.ext import blobstore
from google.appengine.ext import webapp
from google.appengine.ext.webapp import blobstore_handlers
from google.appengine.ext.webapp import template
from google.appengine.ext.webapp.util import run_wsgi_app
from google.appengine.ext import db

class StoredFiles(db.Model):
    nickname = db.StringProperty()
    blobkey = blobstore.BlobReferenceProperty()

    @staticmethod
    def get_all():
        query = db.Query(StoredFiles)
        files = query.get()

        return files


def doRender(handler, page, templatevalues=None):
    path = os.path.join(os.path.dirname(__file__), page)
    handler.response.out.write(template.render(path, templatevalues))

class MainHandler(webapp.RequestHandler):
    def get(self):

        allfiles = StoredFiles.get_all()

        upload_url = blobstore.create_upload_url('/upload')

        templatevalues = {
                'allfiles': allfiles,
                'upload_url': upload_url,

            }
        doRender(self, 'index.html', templatevalues)

class UploadHandler(blobstore_handlers.BlobstoreUploadHandler):
    def post(self):
        upload_files = self.get_uploads('file')
        blob_info = upload_files[0]

        self.redirect('/save/%s' % blob_info.key())

class SaveHandler(webapp.RequestHandler):

    def get(self, resource):

        newFile = StoredFiles()
        newFile.nickname = self.request.get('nickname')
        resource = str(urllib.unquote(resource))
        newFile.blobkey = resource

        newFile.put()

        self.redirect('/')

class ServeHandler(blobstore_handlers.BlobstoreDownloadHandler):
    def get(self, resource):
        resource = str(urllib.unquote(resource))
        blob_info = blobstore.BlobInfo.get(resource)
        self.send_blob(blob_info)

def main():
    application = webapp.WSGIApplication(
          [('/', MainHandler),
           ('/upload', UploadHandler),
           ('/save/([^/]+)?', SaveHandler),
          ], debug=True)
    run_wsgi_app(application)

if __name__ == '__main__':
  main()

根据文档，blobstore处理程序应该通过blob键和表单的其余部分传递给处理程序，它重定向到... blob键正好通过，但没有别的。

有人可以指出我搞砸的地方或者指出一个描述这个用例的好教程吗？

Answer 1

问题是当您将请求重定向到“/ save /％s”时，您发布的表单数据会丢失，这是正常的。

您应该将代码放在UploadHandler中，而不是重定向，就像这样（未经测试的代码）：

class UploadHandler(blobstore_handlers.BlobstoreUploadHandler):
    def post(self):
        try:
            upload_files = self.get_uploads('file')
            blob_info = upload_files[0]

            newFile = StoredFiles()
            newFile.nickname = self.request.get('nickname')
            newFile.blobkey = blob_info.key()
            newFile.put()

            self.redirect('/')
        except:
            self.redirect('/upload_failure.html')

有关类似示例的文档，请参阅此页面：http://code.google.com/appengine/docs/python/tools/webapp/blobstorehandlers.html#BlobstoreUploadHandler

需要使用Google App Engine Blobstore处理上传表单的帮助

1 个答案: