On 08/27/2010 09:21 PM, Michael Bayer wrote:
you coerce incoming arguments into expressions at the constructor level:from sqlalchemy.sql.expression import _literal_as_column class MyWhatever(ColumnElement): def __init__(self, expr, ...): self.expr = _literal_as_column(expr)_literal_as_column basically calls __clause_element__() on the incoming object, and if not present tries turning it into a literal_column() if its a string. You might also try _no_literals, _only_column_elements, etc. based on what you'd expect to see there, all of which do the __clause_element__() conversion.
Thank you _literal_as_column() worked for me. This allows me to use a column from an aliased class.
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