通过BlobInfo删除整个blob信息（blob覆盖目的）

Question

如果我尝试通过BlobInfo删除它，我意识到我的整个blob信息没有被正确删除。 （我想执行blob覆盖）我的代码如下：

from google.appengine.ext import db
from google.appengine.ext import blobstore

class Human(db.Model):
    email = db.StringProperty(required=True)
    date = db.DateTimeProperty(auto_now=True)
    checksum = db.IntegerProperty(required=True)
    version = db.IntegerProperty(required=True)
    content = blobstore.BlobReferenceProperty(required=True)

---

def upload(email, checksum, version, content):
    # Create the file
    file_name = files.blobstore.create(mime_type='application/octet-stream', _blobinfo_uploaded_filename=email)

    # Open the file and write to it
    with files.open(file_name, 'a') as f:
        f.write(content)

    # Finalize the file. Do this before attempting to read it.
    files.finalize(file_name)

    # Get the file's blob key
    blob_key = files.blobstore.get_blob_key(file_name)

    human = model.Human(key_name=email, email=email, checksum=checksum, version=version, content=blob_key)

    # Remove previous blob referenced by this human.
    query = model.Human.all()
    query.filter('email =', email)
    # q.content is blobstore.BlobReferenceProperty(required=True)
    for q in query:
        q.content.delete()

    human.put()

然而，在我基于同一个人编写blob几次之后，这就是我的数据库的样子。我上传了3次。我只希望观察一行。但是，我意识到__BlobFileIndex__中有3行。 Human和__BlobInfo__看起来很好。

如何根据BlobInfo执行正确的删除？

Answer 1

您无法执行blob覆盖。完成后，blob在删除之前是不可变的。

测试一下以说服自己。

Answer 2

尝试，

from google.appengine.ext import blobstore
blobstore.delete( '<blobstore_key>' )