class ActiveRecord::PredicateBuilder::ArrayHandler

def call(attribute, value)
  values = value.map { |x| x.is_a?(Base) ? x.id : x }
  ranges, values = values.partition { |v| v.is_a?(Range) }
  values_predicate = if values.include?(nil)
    values = values.compact
    case values.length
    when 0
      attribute.eq(nil)
    when 1
      attribute.eq(values.first).or(attribute.eq(nil))
    else
      attribute.in(values).or(attribute.eq(nil))
    end
  else
    attribute.in(values)
  end
  array_predicates = ranges.map { |range| attribute.in(range) }
  array_predicates << values_predicate
  array_predicates.inject { |composite, predicate| composite.or(predicate) }
end