On Mar 14, 2012, at 7:50 AM, Ronan Dunklau wrote: > Hello. > > I'd like to append a column clause to a select, or replace an existing > column if one exists with the same key. > > I've seen that ColumnCollection has a convenient 'replace' method, but I > don't know how to achieve that with a select instance. > > I can achieve what I want with the following code: > > columns_dict = OrderedDict((col, key) for col in my_select._raw_columns)) > columns_dict['mycol'] = mynewcol > my_select.raw_columns = columns_dict.values() > my_select._reset_exported. > > But surely there must be something easier/not involving protected > attributes ?
select() has a method with_only_colunms() for this purpose: http://docs.sqlalchemy.org/en/latest/core/expression_api.html#sqlalchemy.sql.expression.Select.with_only_columns -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
