Hi everyone,
in my script I'm using column_mapped_collection to create a collection
indexed by a column of a certain table. This is an example scenario (pseudo
code):
class Parent(object):
def __init__(self):
# define some fileds
def AddChild(self, new_child):
self.children[new_child.name] = new_child
class Child(object):
def __init__(self, name):
self.name = name
rel = relationship(Child,
collection_class=column_mapped_collection(child_tab.c.name))
mapper(Parent, parent_tab, properties={"children":rel})
mapper(Child, child_tab)
p = Parent()
p.AddChild(Child("child1"))
p.AddChild(Child("child2"))
session.add(p)
session.commit()
Everything works fine except for the fact that after the commit it
generally happens that the insertion order is not respected, that is the
child2 record is stored before child1. Is there a way to modify the code so
that the insertion order is preserved? I think this is somehow linked to
the use of Ordereddict but I have no idea about how to achieve it!
Any help is appreciated, thanks in advance!
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