Storm

obj.__dict__ or vars(obj)

Asked by Justin

Hi,

When I instantiate a class that uses Storm, vars(obj) and obj.__dict__ return unexpected results:
class Example(object):
 __storm_table__ = "example"
 id = Int(primary=True)
 attribute = Int()

 def __init__(self, attribute):
  self.attribute = attribute

>>> ex = Example(50)
>>> ex
<__main__.Example object at 0xb10ed0>
>>> dir(ex)
['__class__', '__delattr__', '__dict__', '__doc__', '__getattribute__', '__hash__', '__init__', '__module__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__storm_class_info__', '__storm_object_info__', '__storm_table__', '__str__', '__weakref__', '_storm_columns', 'attribute', 'id']
>>> vars(ex)
{'__storm_object_info__': {}}
>>> ex.__dict__
{'__storm_object_info__': {}}
>>> ex.id
>>> ex.attribute
50

In my opinion Storm breaks the semantics of vars() and __dict__.
Any idea how I could get a dict of all the attributes from an instance?

Cheers,

Justinus

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Launchpad Janitor (janitor) said : 		#1

This question was expired because it remained in the 'Open' state without activity for the last 15 days.

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James Henstridge (jamesh) said : 		#2

The column values are not stored in the instance dictionary, true.

The vars() method is not a reliable method of discovering the attributes on an object though. Consider the following non-storm example class:

    class C(object):
        __slots__ = ['__dict__', 'a']
        def __init__(self):
            self.a = 1
            self.b = 2
        @property
        def c(self):
            return 3

While instances of this class have attributes a, b and c, vars() will only tell you about 'b' because that's the only one that gets stored in the instance dictionary.

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