February 13, 2026
Range on Rails: How PostgreSQL Multirange Turned Complex Booking Logic into Elegant Simplicity
At Kaigi on Rails 2025 , Tomohiro Umeda from RIZAP Technologies presented a real-world backend engineering case study: how to build a flexible reservation system — without fixed time slots — using PostgreSQL’s Range and Multirange types.
The talk, titled:
“Range on Rails — How Multirange Dramatically Simplified Complex Logic”
demonstrates how reframing a problem mathematically can replace tangled conditional logic with clear, declarative data operations.
👉 Read the full article.
