git-hardening/.crosslink/rules/ruby.md

Ruby Best Practices

Code Style

• Follow Ruby Style Guide (use RuboCop)
• Use 2 spaces for indentation
• Prefer symbols over strings for hash keys
• Use snake_case for methods and variables

# GOOD: Idiomatic Ruby
class UserService
  def initialize(repository)
    @repository = repository
  end

  def find_user(id)
    @repository.find(id)
  rescue ActiveRecord::RecordNotFound
    nil
  end
end

# BAD: Non-idiomatic
class UserService
  def initialize(repository)
    @repository = repository
  end
  def findUser(id)  # Wrong naming
    begin
      @repository.find(id)
    rescue
      return nil
    end
  end
end

Error Handling

• Use specific exception classes
• Don't rescue Exception (too broad)
• Use ensure for cleanup

Security

• Use parameterized queries (ActiveRecord does this by default)
• Sanitize user input in views (Rails does this by default)
• Never use eval or send with user input
• Use strong_parameters in Rails controllers