> > you’d use a TypeDecorator for this. See the example > http://docs.sqlalchemy.org/en/rel_0_9/core/types.html#coercing-encoded-strings-to-unicodefor > something similar (coerces to utf-8, just replace that with checking > for non-empty). > > Unfortunately that doesn't quite fit, i need a DDL level check (like the one Boolean generates on databases that dont support native booleans).
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