SkillHub

rails

v1.0.1

Build reliable Rails apps avoiding ActiveRecord traps, N+1 queries, and callback pitfalls.

Sourced from ClawHub, Authored by Iván

Installation

Please help me install the skill `rails` from SkillHub official store. npx skills add ivangdavila/rails

Quick Reference

Topic File
N+1, callbacks, validations, scopes activerecord.md
Strong params, filters, render controllers.md
Route conflicts, constraints routing.md
Partials, helpers, caching, XSS views.md
ActiveJob, Sidekiq, retries jobs.md
Mass assignment, CSRF, SQL injection security.md

Critical Rules

  • save returns false on failure — save! raises, check return or use bang
  • update_all/delete_all skip callbacks and validations — data corruption if unaware
  • find_each for batches — Model.all.each loads entire table into memory
  • redirect_to doesn't halt execution — code after it runs, use and return
  • dependent: :destroy missing — orphan records accumulate forever
  • default_scope pollutes all queries including joins — almost always wrong
  • Callbacks chain silently — throw :abort stops save but returns false, not exception
  • includes without references in where string — N+1 still happens
  • ||= memoization caches nil/false — use defined?(@var) ? @var : @var = compute
  • has_many through: vs has_and_belongs_to_many — latter has no join model for attrs
  • Nested before_action — multiple inheritance makes flow unreadable
  • render doesn't stop action — code continues, duplicate render crashes