♦
2019-10-15 19:35:49
的pg8000PostgreSQL数据库适配器返回一个uuid.UUID()对象（参见其类型映射文档，和SQLAlchemy的已通过该给TypeDecorator.process_result_value()方法。
文档中给出的实现需要一个字符串，但是，这失败了：
>>> import uuid
>>> value = uuid.uuid4()
>>> uuid.UUID(value)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/Users/mjpieters/Development/Library/buildout.python/parts/opt/lib/python2.7/uuid.py", line 133, in __init__
hex = hex.replace('urn:', '').replace('uuid:', '')
AttributeError: 'UUID' object has no attribute 'replace'
快速的解决方法是强制将值改为字符串：
def process_result_value(self, value, dialect):
if value is None:
return value
else:
return uuid.UUID(str(value))
或者你可以先测试类型：
def process_result_value(self, value, dialect):
if value is None:
return value
else:
if not isinstance(value, uuid.UUID):
value = uuid.UUID(value)
return value
我已提交拉取请求＃403来解决此问题（自合并以来）。
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