This page gives an overview of Ruby code completion.
Introduction
If you press Ctrl+space in the ruby editor, a list with information from the current ruby file is displayed. This information includes classes, modules, globals, methods and variables. There are also suggestions for keywords and some pre-defined globals. The keywords and globals are only shown if you have already typed at least one character. If the "token" preceding the cursor does match the beginning of any suggestions you will get no suggestions.