We built a waste management system for hospital facilities in the US and Canada for our client who is a Canadian IT consultant back in mid 2008.

The application will give access to hospital staffs and admins to, among others, enter waste data, categorize them into recycling, hazardous, etc, and view numerous reports and statistics with a graphical interface.

Interesting technological aspects include:

• Complete unit tests for every statistical functions
• Smart country and state dropdowns with Javascript
• Extending basic Ruby classes. For example, the site needs 'dd/mm/yyyy' format on every date that it displays, so we extend the ruby Date class, adding 'format_date' method to all date objects, which makes the code much cleaner.
• Using Google chart and later switch to Open flash chart to display statistics and reports