Course 37 - Building Web Apps with Ruby On Rails | Episode 16:Templates and Partials for Modular Rails APIs
Published: June 29, 2026
Duration: 21:18
In this lesson, you’ll learn about: modular JSON generation, JBuilder templates, and reusable API response structures1. The Problem with as_jsonUsing Ruby on Rails default serialization:🔹 Issue:
Models become bloated with formatting logicBusiness logic + presentation logic get mixed🔹 Example problem:def as_json super.merge(custom_data: ...) end 👉 Key Insight
Models should handle data, not how data is presented2. Introducing JBuilderUsing JBuilder:🔹 What it does:
Moves JSON generation into view templatesKeeps controllers and models clean🔹 File structure:app/views/projects/show.jso...
Models become bloated with formatting logicBusiness logic + presentation logic get mixed🔹 Example problem:def as_json super.merge(custom_data: ...) end 👉 Key Insight
Models should handle data, not how data is presented2. Introducing JBuilderUsing JBuilder:🔹 What it does:
Moves JSON generation into view templatesKeeps controllers and models clean🔹 File structure:app/views/projects/show.jso...