build_scope

# File activerecord/lib/active_record/associations/preloader/association.rb, line 99
        def build_scope
          scope = klass.unscoped
          scope.default_scoped = true

          values         = reflection_scope.values
          preload_values = preload_scope.values

          scope.where_values      = Array(values[:where])      + Array(preload_values[:where])
          scope.references_values = Array(values[:references]) + Array(preload_values[:references])

          scope.select!   preload_values[:select] || values[:select] || table[Arel.star]
          scope.includes! preload_values[:includes] || values[:includes]

          if options[:as]
            scope.where!(klass.table_name => { reflection.type => model.base_class.sti_name })
          end

          scope
        end