Re: [Modeling-users] access of custom object properties

[Sebastien B. <sbi...@us...>]

        Hi,


Mario Ruggier <ma...@ru...> writes:
> hi,
>=20
> what does everyone do when wanting to systematically access
> all, or a subset of, property values of a custom object to something
> else, such as looping to generate html. What is the cleanest and most
> efficient way to a) know the list of class property names, and b) to loop
> over them to obtain their value (without having to do dirty tricks such as
> calculating the get method name for the property, and then eval'ing or
> calling that in some way, or accessing directly the instance private
> attribute for the property).

  A very quick answer to your first question, I'll answer the second one
  later.


  Short answer: Entity.classProperties(), classPropertiesNames(),
                classProperties_attributes(),
                classProperties_relationships()

            and KeyValueCoding

  i.e.:=20

>>> from StoreEmployees.Executive import Executive
>>> from Modeling import ModelSet
>>> ms=3DModelSet.defaultModelSet()
>>> #
>>> # Howto get class properties (given the model)
>>> #
>>> executive_entity=3Dms.entityNamed('Executive')
>>> [a.name() for a in executive_entity.classProperties()]
['firstName', 'officeLocation', 'lastName', 'marks', 'toAddresses', 'toStor=
e']
>>> executive_entity.classPropertiesNames() # alternatively
['firstName', 'officeLocation', 'lastName', 'marks', 'toAddresses', 'toStor=
e']
>>> [a.name() for a in ee.classProperties_attributes()]
['firstName', 'officeLocation', 'lastName']
>>> [a.name() for a in ee.classProperties_relationships()]
['marks', 'toAddresses', 'toStore']
>>> #
>>> # Howto get a value: use KeyValueCoding!
>>> #
>>> from Modeling.FetchSpecification import FetchSpecification
>>> from Modeling.EditingContext import EditingContext
>>> ec=3DEditingContext()
>>> fs=3DFetchSpecification('Executive')
>>> executives=3Dec.objectsWithFetchSpecification(fs)
>>>
>>> executives
[<StoreEmployees.Employees.Executive instance at 0x863c104>]
>>> [[e.valueForKey(k) for k in executive_entity.classPropertiesNames()] fo=
r e in executives]
[['John', '4XD7', 'Cleese', <Modeling.FaultHandler.AccessArrayFaultHandler =
instance at 0x863a53c>, <Modeling.FaultHandler.AccessArrayFaultHandler inst=
ance at 0x839b7b4>, <StoreEmployees.Store.Store instance at 0x863b16c>]]


  Is that what you meant?
=20=20

-- S=E9bastien.

> Also, is moving to new-style properties foreseen, or are we stuck with
> support for 2.1 for a long time?  Or, is it possible to support both
> new style props, as well as 2.1?
>=20
> Regards, mario
>=20
>=20
>=20
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