You problem is pretty simple, the storage you are declaring in
make_view is being de-allocated when it goes out of scope.
Move st=make.storage() to the top level as in
import metakit.metakit as mk
st = make.storage()
That should fix the problem.
Brian
On Sun, 19 Sep 2004 09:24:26 -0400, choppystride <[EMAIL PROTECTED]> wrote:
> Hi,
>
> Please look at the following code:
>
> import metakit.metakit as mk
>
> def make_view ():
> st = mk.storage()
> vw = st.getas( "test[val:I]" )
>
> for i in xrange(3): vw.append( val=i )
>
> print 'inside make_view():'
> print ' view obj: ', vw
> print ' structure: ', vw.structure()
> for row in vw: print ' row.val= ', row.val
> return vw
>
> def test1 ():
> v2 = make_view()
> print 'outside make_view()'
> print ' view obj: ', v2
> print ' structure: ', v2.structure()
> for row in v2: print ' row.val= ', row.val
>
> if __name__ == '__main__':
> print 'metakit version ', mk.version
> test1()
>
> When running the code, I got the following output & error:
>
> metakit version 2.4.9.3
> inside make_view():
> view obj: <PyView object at 8f95c0>
> structure: [Property('I', 'val')]
> row.val= 0
> row.val= 1
> row.val= 2
> outside make_view()
> view obj: <PyView object at 8f95c0>
> structure: []
> row.val=
> Traceback (most recent call last):
> File "test2.py", line 48, in ?
> test1()
> File "test2.py", line 21, in test1
> for row in v2: print ' row.val= ', row.val
> AttributeError: val
>
> A similar problem occurs when I store the view as an instance var in
> an object and then access it later:
>
> class testmk ( object ):
> def __init__ ( self ):
> st = mk.storage()
> self.vw = st.getas( "test[val:I]" )
> for i in xrange(3): self.vw.append( val=i )
>
> def prtvw ( self ):
> print 'tmk view obj: ', self.vw
> print 'tmk: structure: ', self.vw.structure()
> for row in self.vw: print 'tmk: row.val= ', row.val
>
> def test_obj ():
> tmk = testmk()
> tmk.prtvw()
>
> if __name__ == '__main__':
> print 'metakit version ', mk.version
> test_obj()
>
> The resulting output and error are:
>
> metakit version 2.4.9.3
> tmk view obj: <PyView object at 8df7d0>
> tmk: structure: []
> tmk: row.val=
> Traceback (most recent call last):
> File "test2.py", line 69, in ?
> test_obj()
> File "test2.py", line 65, in test_obj
> tmk.prtvw()
> File "test2.py", line 61, in prtvw
> for row in self.vw: print 'tmk: row.val= ', row.val
> AttributeError: val
>
> I can circumvent this problem by manipulating the storage object
> instead. Then whenever I need the view, I can just call
> storage.view(...). This seems to be OK.
>
> Am I doing something wrong or could there be a possible bug?
>
> I'm using Active Python v2.3.2 on Win XP.
>
> Thanks!
>
> --
> Cheers,
> choppystride
>
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