impress/app/models/color.rb

class Color < ActiveRecord::Base
  translates :name
  
  scope :alphabetical, -> { with_translations(I18n.locale).order(Color::Translation.arel_table[:name]) }
  scope :basic, -> { where(:basic => true) }
  scope :standard, -> { where(:standard => true) }
  scope :nonstandard, -> { where(:standard => false) }
  scope :funny, -> { order(:prank) unless pranks_funny? }
  scope :matching_name, ->(name, locale = I18n.locale) {
    ct = Color::Translation.arel_table
    joins(:translations).where(ct[:locale].eq(locale)).
      where(ct[:name].matches(sanitize_sql_like(name)))
  }

  validates :name, presence: true
  
  def as_json(options={})
    {id: id, name: human_name, unfunny_name: unfunny_human_name, prank: prank?}
  end

  def human_name
    if prank? && !Color.pranks_funny?
      unfunny_human_name + ' ' + I18n.translate('colors.prank_suffix')
    else
      unfunny_human_name
    end
  end

  def unfunny_human_name
    if name
      name.split(' ').map { |word| word.capitalize }.join(' ')
    else
      I18n.translate('colors.default_human_name')
    end
  end

  def self.pranks_funny?
    now = Time.now.in_time_zone('Pacific Time (US & Canada)')
    now.month == 4 && now.day == 1
  end

  # TODO: Copied from modern Rails source, can delete once we're there!
  def self.sanitize_sql_like(string, escape_character = "\\")
    pattern = Regexp.union(escape_character, "%", "_")
    string.gsub(pattern) { |x| [escape_character, x].join }
  end
end