Rails

• When immediately returning after calling
  render or redirect_to, put return on the next line, not the same line.
  ^[link]

    # bad
    render :text => 'Howdy' and return
    # good
    render :text => 'Howdy'
    return
    # still bad
    render :text => 'Howdy' and return if foo.present?
    # good
    if foo.present?
      render :text => 'Howdy'
      return
    end

Scopes

• When defining ActiveRecord model scopes, wrap the
  relation in a lambda. A naked relation forces a database connection to be
  established at class load time (instance startup).
  ^[link]

    # bad
    scope :foo, where(:bar => 1)
    # good
    scope :foo, -> { where(:bar => 1) }