Fix Arel.sql deprecation warnings & errors in Rails 5.2/6+

Fix Arel.sql deprecation warnings,errors in Rails 5.2,6+

### config/initializers/arel_sql_monkey_patch.rb

ActiveRecord::Relation.class_eval do

  ### FIX ERRORS FOR Arel.sql in Rails 6+
  ### FIX DEPRECATION WARNINGS FOR Arel.sql in Rails =5.2
  if Rails::VERSION::STRING.to_f >= 5.2
    def pluck(*args)
      if args.any?{|x| x.is_a?(String) }
        new_args = args.map{|x| x.is_a?(String) ? Arel.sql(x) : x }
        super(*new_args)
      else
        super
      end
    end

    def order(*args)
      if args.any?{|x| x.is_a?(String) }
        new_args = args.map{|x| x.is_a?(String) ? Arel.sql(x) : x }
        super(*new_args)
      else
        super
      end
    end

    def reorder(*args)
      if args.any?{|x| x.is_a?(String) }
        new_args = args.map{|x| x.is_a?(String) ? Arel.sql(x) : x }
        super(*new_args)
      else
        super
      end
    end
  end

end