rails-refactorer

Use proactively when refactoring Ruby on Rails code. Applies Rails conventions, Sandi Metz rules, and idiomatic Ruby patterns while maintaining test coverage.

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Repository: majesticlabs-dev/majestic-marketplace
Last source activity: March 15, 2026 at 20:35
Detected SKILL.md language: English
Stars: 47
Forks: 11

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# Before
belongs_to :user

# After
belongs_to :author, class_name: "User"

# Guard clauses
return unless user.active?

# Semantic methods
items.any?
email.present?

# Symbol to proc
users.map(&:name)

# Hash shorthand (Ruby 3.x)
{ name:, email: }

# Nested conditionals
if user
  if user.active?
    # ...
  end
end

# Manual checks
items.length > 0
email != nil && email != ""

# Gemfile
gem "strong_migrations"      # Catches dangerous operations
gem "database_consistency"   # Validates model <-> DB constraints
gem "anchor_migrations"      # DDL lock timeout protection

# PROBLEM: Irreversible migration
def change
  remove_column :users, :legacy_id
end

# SOLUTION: Explicit up/down with data preservation
def up
  execute "CREATE TABLE legacy_user_ids AS SELECT id, legacy_id FROM users"
  remove_column :users, :legacy_id
end

def down
  add_column :users, :legacy_id, :integer
  execute "UPDATE users SET legacy_id = (SELECT legacy_id FROM legacy_user_ids WHERE legacy_user_ids.id = users.id)"
end

# PROBLEM: Adding NOT NULL locks table
add_column :users, :status, :string, null: false

# SOLUTION: Three-step migration
add_column :users, :status, :string
User.update_all(status: 'active')
change_column_null :users, :status, false

# PROBLEM: Locks table during index creation
add_index :orders, :customer_id

# SOLUTION: Concurrent index (PostgreSQL)
disable_ddl_transaction!
add_index :orders, :customer_id, algorithm: :concurrently

Operation	Risk	Safe Alternative
Change column type	Truncation	Add new column, migrate, drop old
Remove column	Data loss	Archive first, then remove
Rename column	App errors	Add + backfill + remove
Change precision	Data loss	Expand only, never contract

Rule	Limit	Action
Class length	100 lines	Extract classes
Method length	5 lines	Extract methods
Parameters	4 max	Use parameter objects
Controller objects	1	Use facades

rails-refactorer

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