On 28.02.2006., at 20:10, Michael Bayer wrote:
Ah nice.
When I select objects from Person.select() I get the same
instance. Is possible to obtain this behaviour using custom object
creation?
show me more specifically what you mean.
from the previous attachments (augmented with prints):
print "---------------"
print "Using pm mapper"
print "---------------"
print pm.select()
for o in pm.select():
o.doSomething()
print pm.select()
# commit necessary to see changes because modifications are not
tracked with the "pm" mapper
print "committing"
objectstore.commit()
print pm.select()
print "-------------------"
print "Using Person.mapper"
print "-------------------"
# Works without commit because the mapper returns the same instances
for o in Person.select():
o.doSomething()
print Person.select()
**************
outputs:
**************
[]
---------------
Using pm mapper
---------------
[<Organization 18388048: Label Bleu, David Krakauer>, <Person
18389968: Smith, John>, <Base: 18362224: base>]
organization adding x to contact
person adding y to address
base doing nothing
[<Organization 18362192: Label Bleu, David Krakauer>, <Person
18390608: Smith, John>, <Base: 18362224: base>]
committing
[<Organization 18389392: Label Bleu, David Krakauerx>, <Person
18389008: Smith, Johny>, <Base: 18362224: base>]
-------------------
Using Person.mapper
-------------------
person adding y to address
[<Person 18389008: Smith, Johnyy>]
-----------
in the first example every select from the pm mapper yeilds different
objects (different python id()).
In this case the modifications are not visible until the commit.
in the second example the modification of the objects are directly
visible in the same thread because Person.select() returns the same
objects.
I was wondering if it was possible to have the same behaviour using
MapperExtension create_instance.
--
marko
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