4

目前,我的范围值是 BigDecimal 获得的Time.now.to_f,我想检索用户的所有文档,如下所示:

table = dynamo_db.tables['some_table']
table.load_schema
docs = table.items.where(:user_id => user_id).select.map {|i| i.attributes}

docs是按范围值降序排列的。

4

1 回答 1

3

在深入研究 SDK 源代码后,我能够为 AWS::DynamoDB::ItemCollection#query 方法找到这个有用的小块

  # @option [Boolean] :scan_index_forward (true) Specifies which
  #   order records will be returned.  Defaults to returning them
  #   in ascending range key order.  Pass false to reverse this.

由于 myuser_id是哈希值,因此我能够将查询修改为:

docs = table.items.query(:hash_value => user_id, :scan_index_forward => false).select.map {|i| i.attributes}
于 2012-03-07T21:29:58.997 回答