Cursor Keeps Breaking My Ruby on Rails Code: Here's Why (And How to Fix It)

Why Cursor Breaks Ruby on Rails Code #

Ever asked Cursor to update a single component and watched it rewrite five other files you never mentioned?

As your Ruby on Rails project grows beyond a few thousand lines of code, Cursor starts making suggestions that break your application. This isn't because Cursor is bad - it's because AI coding assistants lack full context about your codebase architecture, dependencies, and patterns.

Without understanding your project's structure, Cursor generates code that:

• Conflicts with existing patterns and conventions
• Introduces breaking changes to shared components
• Misses critical dependencies and imports
• Violates Ruby on Rails-specific best practices
• Creates type inconsistencies across files

Here's the reality: AI tools like Cursor work brilliantly for small projects. But once you hit 10k-25k lines? They start breaking things faster than you can fix them - unless you give them proper context.

Common Breaking Points in Ruby on Rails #

Cursor typically starts breaking Ruby on Rails code around these thresholds:

• 5,000-10,000 lines: Basic context loss, repetitive suggestions
• 10,000-25,000 lines: Breaking changes to shared utilities
• 25,000+ lines: Architectural inconsistencies, major refactoring needed

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When Does This Typically Happen? #

The problem intensifies when you're working with:

• Multiple interconnected Ruby on Rails components that share state and logic
• Shared state management across features (Redux, Zustand, Context API)
• Custom hooks and utilities used throughout the app
• TypeScript interfaces spanning multiple files
• API integrations with specific patterns

Sound familiar? You're not alone - this is the exact point where most Ruby on Rails builders start fighting with their AI tools instead of building.

Giga AI vs Cursor: What's the Difference? #

The key difference: Cursor generates code. Giga AI manages complexity so your AI tools (including Cursor) work smoothly at scale. Many builders use both together.

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5 Solutions That Actually Work #

1. Give Your AI Tools Proper Context #

Giga AI manages complexity across your entire Ruby on Rails project. It gives Cursor the context it needs to work smoothly and fast, eliminating the chaos that breaks your code as projects scale.

Think of it this way: Cursor without context is like a brilliant developer joining your team with zero onboarding. They'll make changes - but they won't understand your patterns.

2. Create Detailed Context Files #

Document your Ruby on Rails patterns, naming conventions, and architectural decisions in markdown files that Cursor can reference. Include examples of correct implementations.

3. Break Changes Into Smaller Chunks #

Instead of asking Cursor to refactor entire features, make incremental changes to one component or function at a time. Review each change before moving forward.

This isn't slower - it's actually faster because you spend less time debugging cascading breaks.

4. Set Up Automated Testing #

Catch breaking changes immediately with comprehensive tests for your Ruby on Rails components. This helps you identify when Cursor suggestions break existing functionality before they reach production.

5. Establish Code Review Checkpoints #

Don't blindly accept Cursor suggestions. Review generated code for consistency with your Ruby on Rails patterns before committing changes.

Even a 30-second scan can save hours of debugging later.

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How to Prevent This in the Future #

To prevent Cursor from breaking your Ruby on Rails code:

• Maintain context: Use Giga AI to manage complexity and keep AI fast
• Document patterns: Keep up-to-date documentation of your Ruby on Rails conventions
• Test continuously: Run tests after each AI-generated change
• Review before committing: Never auto-accept large code changes
• Track dependencies: Ensure AI suggestions don't break imports and dependencies

Bottom line: The bigger your codebase gets, the more context matters. Without it, even the best AI tools become liabilities instead of assets.

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Get Your AI Working Smoothly and Fast #

Giga AI manages complexity so Cursor stops breaking your Ruby on Rails code. Your AI will work smoothly and fast, no matter how large your project grows.