Question

我一直在浏览GAE Python Blobstore的Google文档：

https://developers.google.com/appengine/docs/python/blobstore/

以及同样的一些问题

Google App Engine (Python) - Uploading a file (image)

Html form submit both datastore entity and blobstore through app engine

How to upload a file using the BlobStore in Python App Engine?

但是我无法将文件上传和输入字段传递到一个表单中进行处理（下面的代码和错误），而且它也没有进入Blobstore。

newpost.html

<form method="post" action="/upload" role="form" enctype="multipart/form-data">
  <div class="col-xs-6">
   <div class="form-group">
    <label for="title"><h2><small>Enter Title of this Post</small></h2>
    <input type="text" name="subject" value="{{ subject }}" class="form-control">
    </label>
   </div>
  </div>
   <div class="pull-right">

  <div class="form-group">
   <label for="exampleInputFile">File upload (Optional)</label>
     <input type="file" id="uploadFile" name="uploadFile">
   <p class="help-block">
   You are responsible for copyrighted or inappropriate files that you upload.</p>
  </div>

<hr><hr>
    <img src="../img/powered_by.png" width="200" alt="logo" class="img-rounded">
   </div>
   <div class="col-xs-6">
     <label for="art"><h2><small>Enter Post</small></h2></label>
      <div class="input-group">
        <textarea name="content" class="form-control input-lg">{{ content }}</textarea>
        <span class="input-group-addon input-group-btn">
        <button type="submit" class="btn btn-danger btn-lg">Submit</button>
        </span>
      </div>
     <div style="color:red">{{ error }}</div>
   </div>
</form>

weblog.py

class PixHandler(webapp2.RequestHandler):
  def get(self):
    upload_url = blobstore.create_upload_url('/upload')
##    self.response.out.write('<html><body>')
##    self.response.out.write('<form action="%s" method="POST" enctype="multipart/form-data">' % upload_url)
##    self.response.out.write("""Upload File: <input type="file" name="file"><br> <input type="submit"
##        name="submit" value="Submit"> </form></body></html>""")

class UploadHandler(blobstore_handlers.BlobstoreUploadHandler):
  def post(self):
    upload_files = self.get_uploads('uploadFile')  # from upload field in the form
    blob_info = upload_files[0]
    tag = '/pic/%s' % blob_info.key()
    servePic = BlogPosts(imageTag = tag) # BlobStore entry

    subject = self.request.get("subject")
    content = self.request.get("content")
    query = self.request.get("rname")
    if (query):
        self.render_query()
    elif subject and content:
        msg = "Looks good"
        entry = BlogPosts(subject = subject, content = content)
        entry_key = entry.put()
        permalink = entry_key.id()
        self.redirect("./%s" % str(permalink))
    elif (not subject and not content):
        msg = "Neither box can be empty"
        self.render_html(subject, content, msg)

    self.redirect(tag) # serves pix with unique id in url

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)

HTTP错误：

File "C:\Python27\udacity-web-app-rs-1\weblog.py", line 101, in post
    blob_info = upload_files[0]
IndexError: list index out of range

没有进入重定向页面（转到HTTP错误页面）。此外，image key()未进入我为其设置的数据存储区值

使用/upload处理从表单到UploadHandler。

编辑：

我意识到一些代码与这些问题无关。没有改变这个问题。

Answer 1

您需要使用从create_upload_url获取的值作为表单的action。 Appengine将为您处理保存blob，然后它将使用blobinfo和剩余的表单参数向您/上传URL发出请求。

Python Google App Engine - 多部分表单输入Blobstore和Datastore

1 个答案: