where_values_hash

# File activerecord/lib/active_record/relation.rb, line 461
    def where_values_hash
      equalities = with_default_scope.where_values.grep(Arel::Nodes::Equality).find_all { |node|
        node.left.relation.name == table_name
      }

      Hash[equalities.map { |where| [where.left.name, where.right] }].with_indifferent_access
    end