Ah... much better :)
def getProperties2(instance):
properties = list()
mapper = sqlalchemy.orm.object_mapper(instance)
for prop in mapper.iterate_properties:
if isinstance(prop, sqlalchemy.orm.properties.SynonymProperty):
properties.append(prop.key)
print("::getProperties2 > Returning: %s" % properties)
return properties
Gives me (as wanted):
::getProperties2 > Returning: ['id', 'userName', 'password']
Thank you!
2010/12/21 Michael Bayer <[email protected]>:
> have you tried mapper.iterate_properties ?
>
>
> On Dec 21, 2010, at 11:14 AM, Hector Blanco wrote:
>
>> I found a "maybe" way... but I don't know if it's good idea... the
>> "propertyProxy" instances have a field called "descriptor" which the
>> "InstrumentedAttribute" don't have... so I can always do this:
>>
>> --------------------------------------------------
>> def getProperties4(cls):
>> properties = list()
>>
>> for varKey in vars(cls):
>> varVal = getattr(cls, varKey)
>> try:
>> if "descriptor" in vars(varVal):
>> if isinstance(getattr(varVal, "descriptor"),
>> property):
>> properties.append(varKey)
>> except TypeError:
>> pass
>> print("Properties found: '%s'" % properties)
>> return properties
>> --------------------------------------------------
>> That works...
>> Properties found: '['id', password', 'userName']'
>>
>> ...but I don't really know what I'm exactly touching here... (and how
>> "dangerous"... or correct it may be)
>>
>> 2010/12/21 Hector Blanco <[email protected]>:
>>> 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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>>>>
>>>>
>>>
>>
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>
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