我有一个“文章”集合,一些示例数据可能如下所示:
[
{body: 'Interesting news in Siberia and so on etc. etc. etc. and lolcats too',
author: 'John Doe',
tags: [{tid:24, name: "Siberia"},
{tid: 5231, name: "Lolcats"},]
},
{body: 'Something is going on in Siberia and France',
author: 'Jane Doe',
tags: [{tid:24, name: "Siberia"},
{tid: 6432, name: "France"},]
},
]
我需要的输出是一个不同的标签列表:
[
{tid: 24, name: 'Siberia'},
{tid: 5231, name: 'Lolcats'},
{tid: 6432, name: 'France'},
]
我一直在努力处理一些 mapReduce 查询和不同的聚合,但没有结果。