This page explains how to use the Ruby quick outline.
Introduction
Use the Ruby quick outline (shown below) to see a pop-up outline view and quickly navigate between sections of your code.
Instructions
To display the Ruby quick outline view for a segment of code, press Ctrl+O. The quick outline pop-up displays the outline of the current file and allows you to quickly navigate between sections.
Use the text field at the top of the outline to filter the contents by name. This filter allows you to very quickly navigate the file by typing class, module, method, or variables names.