What’s New in RubyMine 2025.2

Cloud-based code completion for ERB has been expanded. It now works within ERB tags, such as <% <caret> -%> and <%= <caret> %>.

This feature builds on RubyMine’s existing AI-based code completion for Ruby and includes enhancements like:

• Better string handling.
• Support for multiline code.
• Avoidance of duplicate closing tags.

AI Assistant chat now leverages the Search Everywhere functionality for Classes and Symbols to incorporate more accurate context.

You can now define project-specific instructions that guide AI responses, such as coding style or framework constraints. Rules are stored inside your project and can be shared across the team, ensuring alignment and consistency without repeated manual input.

Learn more

AI Assistant allows you to work with local models by connecting third-party LLMs running on your machine. In addition to Ollama and LM Studio, you can now use any model server compatible with the OpenAI API, such as llama.cpp, LiteLLM, and others. This lets you take advantage of AI-powered features for free, with no data leaving your machine.

JetBrains AI Assistant now supports image attachments in the chat when using Anthropic and OpenAI models.

Junie, the JetBrains AI coding agent available in RubyMine 2025.2 as a plugin, features the following major updates:

• It is now 30% faster: We’ve optimized the speed of Junie without sacrificing quality.
• MCP support is now available: The Model Context Protocol allows Junie to connect external sources like databases, file systems, or APIs. This improvement makes Junie significantly more useful in practical scenarios. LLMs and agents are often limited by their lack of access to real-world context and tools. The MCP addresses this by connecting Junie to external servers.
• Junie is now integrated with Remote Development: You can work remotely with your team – and delegate tasks to Junie at the same time.

RubyMine 2025.2 allows you to disable specific type signature providers used for certain code inspections.

This can be particularly helpful in cases where an inspection uses data from a few services and you want to avoid conflicts between them.

For example, the Mismatched Argument Type inspection uses RBS and Sorbet, which might conflict with each other. To avoid any issues, you can disable one of them.

To find all inspections with potential conflicts and disable some of their providers, go to Settings | Editor | Inspections | Ruby | Probable bugs.

RubyMine 2025.2 now supports hover hints for RBS declarations and references.

Press Ctrl and hover over a declaration in an .rbs file to see a preview of the target.

This preview is particularly helpful for quick, in-context insights into a reference's target. For example, you can use it to view the definition of a type alias without navigating to it.

Improved type support with RBS Collection is now enabled by default.

You’ll notice improved precision in features such as:

• Find Usages.
• Rename refactoring.
• Inlay hints when viewing source code with type signatures.

Note: The RBS Collection integration requires RBS 3.2, which comes bundled with Ruby 3.4. If you're using an older Ruby version, RubyMine will prompt you to install the appropriate gem.

RubyMine 2025.2 comes with improvements for Bundler that are especially beneficial for multimodule projects.

Fewer notifications, fewer distractions

RubyMine now groups missing gem notifications across all modules into a single alert, reducing clutter and interruptions.

Customizable Bundler setup

To save you from dealing with dialogs each time you invoke a Bundler command, we’ve introduced a new Bundler tab. Located under Settings | Tools, it allows you to:

• Automatically install the required Bundler version.
• Set default arguments for all future Bundler commands.

New installation workflow

RubyMine now installs gems one module at a time to prevent conflicts and avoid reinstalling gems shared between multiple modules.

We’ve optimized how RubyMine handles code completion for exception constants. In cases where no prefix is provided (for example, when triggering autocompletion without typing), the suggestions are now limited to a focused set of relevant constants.

This adjustment significantly boosts performance, especially in large projects.

In RubyMine 2025.2, the process of installing debugger gems is non-modal, with progress displayed in the terminal window instead of the progress bar.

RubyMine powers the newly introduced Ruby linter in Qodana.

The Ruby linter brings RubyMine’s robust code inspections into automated workflows, helping you catch issues and maintain high code quality across your projects.

Qodana for Ruby is currently in Early Access. You can find more details in the Qodana documentation.