Hi All,
I'm working on a variation of this recipe:
http://www.sqlalchemy.org/trac/wiki/UsageRecipes/VersionedRows
...and I've got a couple of questions about changed objects:
- do objects end up in session.dirty as a result of attributes being set
or changed?
For example:
class Example(Versioned, Base):
__tablename__ = 'example'
id = Column(Integer, primary_key=True)
data = Column(String)
>>> obj = session.query(Example).get(1)
>>> print obj.data
'something'
>>> obj.data = 'something'
Is obj now considered dirty?
Hopefully not, hopefully it'll only be considered dirty if the following
was done:
>>> obj.data = 'something else'
Would both of the above result in obj being dirty or just the latter?
If both, are there any hooks for affecting this behaviour?
- in a SessionExtension's before_flush method, is there any way I can
tell which attributes have changed? Or, almost the same, can I check
some specific attributes to see if they've changed?
cheers,
Chris
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