build

# File activerecord/lib/active_record/relation/predicate_builder.rb, line 67
      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