class ActiveRecord::PredicateBuilder

def self.build(attribute, value)
  case value
  when Array
    values = value.to_a.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) }
  when ActiveRecord::Relation
    value = value.select(value.klass.arel_table[value.klass.primary_key]) if value.select_values.empty?
    attribute.in(value.arel.ast)
  when Range
    attribute.in(value)
  when ActiveRecord::Base
    attribute.eq(value.id)
  when Class
    # FIXME: I think we need to deprecate this behavior
    attribute.eq(value.name)
  else
    attribute.eq(value)
  end
end