brady8/thumbs_up — pull request #36 by kevinelliott (2012-02-23 11:32:47+00:00)
Title: Added PostgreSQL support for plusminus_tally

Database agnostic type_for_sql injection for typecast in select's SUM.
Use the provided column_names_for_tally for enumerating the current table's column names since PostgreSQL requires it when you use aggregate functions (this could alternately be used in the select instead of the group).