class UsernameValidator # Public: Perform the validation of a field in a given object # it adds the errors (if any) to the object that we're giving as parameter # # object - Object in which we're performing the validation # field_name - name of the field that we're validating # # Example: UsernameValidator.perform_validation(user, 'name') def self.perform_validation(object, field_name) validator = UsernameValidator.new(object.send(field_name)) unless validator.valid_format? validator.errors.each { |e| object.errors.add(field_name.to_sym, e) } end end def initialize(username) @username = username @errors = [] end attr_accessor :errors attr_reader :username def user @user ||= User.new(user) end def valid_format? username_exist? username_length_min? username_length_max? username_char_valid? username_first_char_valid? errors.empty? end private def username_exist? return unless errors.empty? unless username self.errors << I18n.t(:'user.username.blank') end end def username_length_min? return unless errors.empty? if username.length < User.username_length.begin self.errors << I18n.t(:'user.username.short', min: User.username_length.begin) end end def username_length_max? return unless errors.empty? if username.length > User.username_length.end self.errors << I18n.t(:'user.username.long', max: User.username_length.end) end end def username_char_valid? return unless errors.empty? if username =~ /[^A-Za-z0-9_]/ self.errors << I18n.t(:'user.username.characters') end end def username_first_char_valid? return unless errors.empty? if username[0] =~ /[^A-Za-z0-9]/ self.errors << I18n.t(:'user.username.must_begin_with_alphanumeric') end end end