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Contents
module Spree
module Core
class NumberGenerator < Module
BASE = 10
DEFAULT_LENGTH = 9
attr_accessor :prefix, :length
def initialize(options)
@prefix = options.fetch(:prefix)
@length = options.fetch(:length, DEFAULT_LENGTH)
@letters = options[:letters]
end
def included(host)
generator_method = method(:generate_permalink)
generator_instance = self
host.class_eval do
validates(:number, presence: true, uniqueness: { allow_blank: true })
before_validation do |instance|
instance.number ||= generator_method.call(host)
end
define_singleton_method(:number_generator) { generator_instance }
end
end
private
def generate_permalink(host)
length = @length
loop do
candidate = new_candidate(length)
return candidate unless host.exists?(number: candidate)
# If over half of all possible options are taken add another digit.
length += 1 if host.count > Rational(BASE**length, 2)
end
end
def new_candidate(length)
characters = @letters ? 36 : 10
@prefix + SecureRandom.random_number(characters**length).to_s(characters).rjust(length, '0').upcase
end
end # Permalink
end # Core
end # Spree
Version data entries
66 entries across 66 versions & 1 rubygems