Decimal Numbers presentation

Hello guys! I´m using Ruby On Rails with Sql Server DataBase. I have a
decimal field in a table that looks like this:
Length:5 Precision:8 Scale:2
But, in the browser view the field appears truncated. The number 0.70
is truncated to 0.0. How can I resolve this?

Connecting via ODBC the numbers are showed correctly!
Do I need the DBI module to connect via odbc to SQL Server Data Base?