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# frozen_string_literal: true
require "active_support/concern"
module Decidim
# This concern contains the logic related to nicknames.
module Nicknamizable
extend ActiveSupport::Concern
included do
validates :nickname, length: { maximum: nickname_max_length }, allow_blank: true
end
class_methods do
#
# Maximum allowed nickname length
#
def nickname_max_length
20
end
#
# Converts any string into a valid nickname
#
# * Parameterizes it so it's valid as a URL.
# * Trims length so it fits validation constraints.
# * Disambiguates it so it's unique.
#
# name - the String to nicknamize
# scope - a Hash with extra values to scope the nickname to
#
# Example to nicknamize a user name, scoped to the organization:
#
# nicknamize(user_name, organization: current_organization)
#
def nicknamize(name, scope = {})
return unless name
disambiguate(
name.parameterize(separator: "_")[nickname_length_range],
scope
)
end
private
def nickname_length_range
(0...nickname_max_length)
end
def disambiguate(name, scope)
candidate = name
2.step do |n|
return candidate unless exists?(scope.merge(nickname: candidate))
candidate = numbered_variation_of(name, n)
end
end
def numbered_variation_of(name, number)
appendix = "_#{number}"
"#{name[0...(nickname_max_length - appendix.length)]}#{appendix}"
end
end
end
end
Version data entries
32 entries across 32 versions & 1 rubygems