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IntelliJ IDEA features the support for Ruby and Ruby on Rails, the open source Ruby framework for productive Ruby on Rails application development.
See the Live Ruby demo

The Ruby plug-in (http://plugins.intellij.net/plugin/?id=1293) makes IntelliJ IDEA the smart Ruby and Ruby on Rails editor, ideal for the full cycle application development. It provides the assisted Ruby coding, with keyword completion, Ruby syntax highlighting and other productivity-aimed features, including on-the-fly code validation and error highlighting. Now you can use all the power of IntelliJ IDEA to develop various Ruby and Ruby on Rails applications (cms, wiki, forums, blogs, and other Web services).

• Dedicated Ruby and Rails modules with Ruby SDK support
• Dedicated Rails project view
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• Basic code completion for Ruby keywords
• Automatic completion for Ruby statements
• Ruby syntax highlighting with braces matching
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• Ruby code formatting and automatic code styling
• On-the-fly error checking and code validation
• Smart structure view for Ruby files
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• Quick Ruby documentation (RDoc) view and lookup
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• Dedicated run configuration for Ruby and Rails with support for scripts
• Intention actions to automatically create Ruby access modifiers and Rails skeletons and actions
• Support for Go to class, file and symbol for Ruby files
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• Quick access to Rails generators and Rake tasks through context menus
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