> On Dec 12, 2014, at 4:12 PM, dewey <[email protected]> wrote:
>
> after re-reading the docs, it seems I misunderstood the purpose of:
>
> __mapper_args__ = {'column_prefix': 'ste_'}
>
> that option is adding the prefix onto the Class att names, NOT onto the
> actual DB column names in the table....
>
> I'm looking for a way to add a global prefix onto my DB column names.
>
> All suggestions appreciated.
assuming this is a fixed prefix that is just set up once you would either make
a function:
from sqlalchemy import Column as _Column
def Column(name, **kw):
newname = “myprefix_%s” % name
return _Column(newname, key=name, **kw)
or if that is too simple, use the before_parent_attach event, which you’d have
to stick on Column:
@event.listens_for(“before_parent_attach”, Column)
def attach(target, parent):
target.name = “myprefix_%s” % target.name
# target.key is OK here
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