Thanks, Mike!
That let me slap together a quick mixin class to store versioned data (of
specific columns) in PostgreSQL -
class RevisionObject(object):
> revision_columns = None
> revision_id = sa.Column(sa.Integer, nullable=False, default=0 )
> revision_history = sa.Column( sqlalchemy.dialects.postgresql.HSTORE ,
> nullable=True )
> def
> generate_snapshot(self,only_fields=None,timestamp=None,editor=None):
> rval = {
> 'data': {} ,
> 'meta': {
> 'timestamp_edit' : timestamp ,
> 'useraccount_id__editor' : editor ,
> }
> }
> for c in self.revision_columns :
> rval['data'][c] = getattr(self,c)
> return rval
>
> def generate_diff(self,timestamp=None,editor=None):
> insp = inspect(self)
> rval = {
> 'data': {} ,
> 'meta': {
> 'timestamp_edit' : timestamp ,
> 'useraccount_id__editor' : editor ,
> }
> }
> for c in self.revision_columns :
> h = getattr( insp.attrs , c).history
> if h[1]:
> continue
> rval['data'][c] = h[0]
> if rval['data'] :
> return rval
> return {}
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