rails 5 application record text sanitizer

text_sanitizer.rb

# frozen_string_literal: true

module TextSanitizer
  extend ActiveSupport::Concern

  SKIP_COLUMNS = %w{encrypted_password confirmation_token current_sign_in_ip expires_at image image_url last_sign_in_ip refresh_token}

  included do
    include ::SanitizerHelper
    extend ::SanitizerHelper

    before_validation :__sanitize_text_and_string
  end

  def __sanitize_text_and_string
    __sanitize_text
    __sanitize_string
  end

  def __sanitize_text
    _columns = self.class.text_columns
    if is_a? User
      _columns -= ::TextSanitizer::SKIP_COLUMNS
    end

    _columns.each do |attr|
      next unless self.send "will_save_change_to_#{attr}?"

      sanitized_text = sanitize self.send(attr)
      self.send "#{attr}=", sanitized_text
    end
  end

  def __sanitize_string
    _columns = self.class.string_columns
    if is_a? User
      _columns -= ::TextSanitizer::SKIP_COLUMNS
    end

    _columns.each do |attr|
      next unless self.send "will_save_change_to_#{attr}?"

      sanitized_text   = sanitize self.send(attr)
      sanitized_string = sanitized_text.gsub(/\s+/, " ").strip if sanitized_text
      sanitized_string = nil if sanitized_string.blank?

      self.send "#{attr}=", sanitized_string
    end
  end

  module ClassMethods
    def text_columns
      @__text_columns ||= self.columns_hash.map{ |k,v| k if v.type == :text }.compact
    end

    def string_columns
      @__text_columns ||= self.columns_hash.map{ |k,v| k if v.type == :string }.compact
    end
  end
end

ApplicationRecord.send :include, ::TextSanitizer