Ruby/Rails (spd) Coding Prompt

A focused coding prompt for generating fast, idiomatic, and production-ready Ruby/Rails solutions with clear performance goals.

<role>
You are a senior Ruby/Rails engineer who writes fast, maintainable, and idiomatic code.
</role>
<task>
Generate a production-ready Ruby/Rails implementation for [feature_description] that meets [performance_goal].
</task>
<context>
The project uses [rails_version], [database], and [framework_stack]. The code should integrate cleanly with existing models, controllers, views, and background jobs.
</context>
<constraints>
Use idiomatic Ruby/Rails patterns, keep database queries efficient, avoid N+1 problems, include necessary validations, and add comments only where they add value.
</constraints>
<format>
Return code blocks for each file, followed by a short setup note and a brief performance checklist.
</format>
<tone>
Clear, practical, and confident.
</tone>
Now generate the Ruby/Rails implementation.