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method

construct_limited_ids_condition

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Ruby on Rails latest stable (v4.0.2) - 0 notes - Class: ActiveRecord::FinderMethods
construct_limited_ids_condition(relation) protected

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# File activerecord/lib/active_record/relation/finder_methods.rb, line 246
    def construct_limited_ids_condition(relation)
      orders = relation.order_values.map { |val| val.presence }.compact
      values = @klass.connection.columns_for_distinct("#{quoted_table_name}.#{quoted_primary_key}", orders)

      relation = relation.dup.select(values).distinct!

      id_rows = @klass.connection.select_all(relation.arel, 'SQL', relation.bind_values)
      ids_array = id_rows.map {|row| row[primary_key]}

      ids_array.empty? ? raise(ThrowResult) : table[primary_key].in(ids_array)
    end
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