Switching the nature of a project to RadRails

Open your .project file, and replace the element with

<natures>
    <nature>org.radrails.rails.ui.railsnature</nature>
</natures>

Here’s how my project looks like

<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
    <name>typo</name>
    <comment></comment>
    <projects>
    </projects>
    <buildSpec>
    </buildSpec>
    <natures>
        <nature>org.radrails.rails.ui.railsnature</nature>
    </natures>
</projectDescription>

Then either refresh your project or restart eclipse/RadRails. The Project icons should now have the little decorator with the Rails logo.