First of all, thank you for replying.
I don't really know if I understood your idea.
I dug a bit more in the User class (not the instance, but what it
would be self.__class__) and the problem is that both "password" and
"_password" have a "__get__":
I changed the getProperties method a bit, to introspect the __class__ thing:
def getProperties(cls):
properties = list()
for varName in vars(cls):
log.debug("Studying prop '%s' of type: %s" %(varName,
type(getattr(cls, varName))))
if varName == "password" or varName == "_password":
valTmp = getattr(cls, varName)
print(" \t Has %s a __get()__? %s" % (varName,
getattr(valTmp, "__get__")))
print(" \t Contents of %s" % varName)
for key, val in valTmp.__dict__.iteritems():
print(" \t\t %s: %s" % (key, val))
return None
#return properties
----- And it outputs this (showing only the password thing:) ---------
Studying prop '_password' of type: <class
'sqlalchemy.orm.attributes.InstrumentedAttribute'>
Has _password a __get()__? <bound method
InstrumentedAttribute.__get__ of
<sqlalchemy.orm.attributes.InstrumentedAttribute object at 0xa26e46c>>
Contents of _password
parententity: Mapper|User|users
__doc__: None
impl: <sqlalchemy.orm.attributes.ScalarAttributeImpl object at
0xa3d758c>
key: _password
comparator: <sqlalchemy.orm.properties.Comparator object at
0xa26e44c>
Studying prop 'password' of type: <class
'sqlalchemy.orm.attributes.propertyProxy'>
Has password a __get()__? <bound method propertyProxy.__get__ of
<sqlalchemy.orm.attributes.propertyProxy object
at 0xa26eacc>>
Contents of password
_comparator: <function comparator at 0xa269bc4>
key: password
descriptor: <property object at 0xa25ef7c>
_parententity: Mapper|User|users
user_prop: <property object at 0xa25ef7c>
__doc__: Get password
impl: <sqlalchemy.orm.attributes._ProxyImpl object at
0xa26eaec>
------------------
I have also tried to check isinstance(getattr(cls, varName),
sqlalchemy.orm.attributes.InstrumentedAttribute) (even though it may
not be the best option, but...) and the problem is that both
"password" and "_password" happen to be InstrumentedAttributes
(propertyProxy extends from InstrumentedAttribute).
I've seen in the "attributes.py" file an "is_instrumented" method...
Maybe I could get the vars of an instance (not the class, no... an
instance) which would give me:
(["_sa_instance_state", "_id", "_userName", "_password"]),
then check if these variables are instrumented ("_sa_instance_state"
isn't) and then check if the class has the attributes ["id",
"userName" and "password"] but in order to do that I need to remove
the first character of the attribute name (to get "userName" from
"_userName") and that seems it's going to mess up with the
performance...
Thank you!
2010/12/20 Michael Bayer <[email protected]>:
>
> On Dec 20, 2010, at 7:30 PM, Hector Blanco wrote:
>
>> Hello all!
>>
>> I have an application running under Python2.6 and the classes are set
>> up with properties (in a Python2.4 style, though).
[ . . . ]
>> So here's the question:
>> Is there any way to get the properties of a class mapped with SqlAlchemy?
>
> I'd look at the object to see if it has a __get__() method, since that's
> what defines a "descriptor" in Python, not just isinstance(x, property).
> duck typing
>
>
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