On Jul 7, 2010, at 1:30 AM, Lance Edgar wrote:
> Hi, I was wondering what method might be used (assuming it's possible)
> to redefine a column's attribute type after the mapping has already
> been made? Specifically I have the following scenario:
>
>
> from sqlalchemy import *
> from sqlalchemy.orm import mapper
>
> metadata = MetaData()
>
> orders = Table(
> "orders", metadata,
> Column(id, Integer, primary_key=True),
> Column(quantity, Numeric(8,3)),
> )
>
> class Order(object):
> pass
>
> mapper(Order, orders)
>
> # ... then later ...
>
> from sqlalchemy.orm import class_mapper
>
> class_mapper(Order).get_property('quantity').update_to_integer_type()
>
>
> Obviously that last method doesn't exist, but I would like something
> along those lines. Basically I want to type-cast the column at the
> ORM layer instead of everywhere it appears in the UI. I can't just
> pass Integer to the Column definition because that's happening
> elsewhere in another package. Thanks in advance for any suggestions.
map it as column_property(cast(table.c.column, Integer)).
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