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CVSS 8.1 universal RCE chain through ERB::DeprecatedInstanceVariableProxy and Marshal.load. Detection, upgrade path, Rails 7.0/7.1 EOL options.

TDD looks slow on paper. The real ledger is one hour writing tests against six hours debugging next week. Here is why lightweight TDD wins.

The refactor step breaks more tests than green ever does. Cap each refactor commit at three lines of Ruby and the suite stays green every time.

A working Ruby tutorial for TDD on a small Order class. The 90-second loop, Shameless Green, Tidy First commits, and the reset move that makes it all safe.

Master RSpec testing for LangChain-Ruby with 25 working examples. Learn mocking, VCR, WebMock, and CI/CD automation. Build reliable AI features with 95%+ test coverage.

Falcon async web server for Ruby: Master fiber-based concurrency, benchmark vs Puma/Unicorn, deploy in production. Scale Rails apps, handle concurrent connections, boost performance ✓

How one Ruby method change from gsub to tr cut CPU usage by 40%. Real examples of small method choices that cascade into big performance wins in Rails apps.

Learn how to build AI-powered applications with LangChain-Ruby. Complete guide with working code examples, Rails integration, and production best practices for junior Ruby developers.

Master Ruby 3.4's YJIT compiler for up to 30% performance gains in Rails applications. Complete guide with benchmarks, configuration, and production deployment strategies.

Learn how to migrate from DelayedJob to Rails 8 Solid Queue with real-world examples, performance benchmarks, and production deployment strategies. Achieve 3x job processing improvement.