Tag: distinct

Rails＆Mongoid独特的结果

考虑下面的mongo集合示例： {“_id” : ObjectId(“4f304818884672067f000001”), “hash” : {“call_id” : “1234”}, “something” : “AAA”} {“_id” : ObjectId(“4f304818884672067f000002”), “hash” : {“call_id” : “1234”}, “something” : “BBB”} {“_id” : ObjectId(“4f304818884672067f000003”), “hash” : {“call_id” : “1234”}, “something” : “CCC”} {“_id” : ObjectId(“4f304818884672067f000004”), “hash” : {“call_id” : “5555”}, “something” : “DDD”} {“_id” : ObjectId(“4f304818884672067f000005”), “hash” : {“call_id” : “5555”}, “something” : […]