app/models/color.rb
# == Schema Information
#
# Table name: colors
#
# id :integer not null, primary key
# name :string(255)
# created_at :datetime
# updated_at :datetime
#
class Color < ActiveRecord::Base
has_many :user_lacquer_colors
has_many :user_lacquers, through: :user_lacquer_colors
has_many :lacquers, through: :user_lacquers
validates :name, presence: true, uniqueness: true
end