聪明的方式引用GAE中的Blob [英] Referencing Blobs in GAE the smart way

问题描述

我正在将网站从IIS迁移到GAE，并试图批量上传大量图片。除了那个特殊的挑战之外，我还有一个更关心我的问题。该网站的所有内容（存储在数据库中）都是这样引用图像的： $ b http://myurl.com/images/some-folder/maybe-another-folder/image-name.jpg

我在Python中创建了一个简单的处理程序来处理图像：

  class ServeBlobs（blobstore_handlers.BlobstoreDownloadHandler）：
 def get（self，resource）：
 query =where文件名='％s'％资源
 blobs = blobstore.BlobInfo.gql （query）.fetch（1）
 self.send_blob（blob_infos [0]）
  

（'/ images /(.*）'，ServeBlobs）
<$ p

 / code> 

这很好用，不需要单独的查找表。但是，我很确定hte Blob的文件名属性不能包含'/'，那么我在上面的例子中如何处理文件夹（其中有很多）称为some-folder或者maybe-another-folder？

此外，在不同文件夹中的图像名称中几乎肯定存在重叠，例如

 / images / foldera / main.jpg
和
/images/folderb/main.jpg
  

有什么想法？

解决方案

您应该将上传表单指定为文件的完整路径作为附加字段，并且完全忽略上传文件名，或将其追加到提供的路径中。

然后，您应该创建一个数据存储模型，其中包含 BlobReferenceProperty 引用blob，以完整路径作为关键名称。这样，您可以通过简单的数据存储获取blob而不是更昂贵的查询，并且还可以存储任何与实体有关的信息（例如标题信息等）。

I'm migrating a site from IIS to GAE and am trying to batch upload a lot of images. Further to that particular challenge, I have one that concerns me more. All of the content for the site (stored in a DB) reference the images as such:

http://myurl.com/images/some-folder/maybe-another-folder/image-name.jpg

I have created a simple handler in Python to serve images:

class ServeBlobs(blobstore_handlers.BlobstoreDownloadHandler):    
  def get(self, resource):        
      query = "where filename='%s'" % resource        
      blobs = blobstore.BlobInfo.gql(query).fetch(1)        
      self.send_blob(blob_infos[0])

and the 'route' is as follows

('/images/(.*)', ServeBlobs)

This works great and doesn't require a separate lookup table. However, I'm pretty sure the filename property of hte Blob can't contain '/' so what do I do about the folders (of which there are many) called some-folder or maybe-another-folder in the example above?

Furthermore, there is almost certainly overlap in image names in different folders, e.g.

"/images/foldera/main.jpg"
and
"/images/folderb/main.jpg"

Any ideas?

解决方案

You should have the upload form specify a complete path to the file as an additional field, and either ignore the upload filename entirely, or append it to the provided path.

Then, you should create a Datastore model that has a BlobReferenceProperty referencing the blob, with the full path as the key name. That way, you can look up a blob via a simple datastore get instead of a more expensive query, and you can additionally store any relevant information against the entity (such as header information, etc).

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