mongodb更新数组中的所有匹配项
假如集合中有如下数据{ "_id" : ObjectId("4b97e62bf1d8c7152c9ccb74"), "title" : "ABC","comments" : [ { "by" : "joe", "votes" : 3 }, { "by" : "jane", "votes" : 7 } ] }
将comments值中所有votes的值改为1
t.update( obj, {$set:{'comments.$.votes':1}}, false, true )
结果为:
{ "_id" : ObjectId("4b97e62bf1d8c7152c9ccb74"), "title" : "ABC","comments" : [ { "by" : "joe", "votes" : 1 }, { "by" : "jane", "votes" : 1 } ] }
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