Question

我得到了我在RIAK中存储的Map数据类型。这是包含少数包含计数器的地图的地图。序列化到json程序的预期输出将是：

{
"sample_map_key" : {
    "maps" : {
        "Q1" : {
            "counters" : {
                "a1" : 10,
                "a2" : 13
            }
        },
        "Q2" : {
            "counters" : {
                "a1":31,
                "a2":21,
                "a3":10
            }
        }
    }
}

但我得到了异常：“TypeError：unhashable type：'Map'”。谢谢你的帮助。以下是示例代码：

from riak.datatypes import Map
import riak
def main():
    store_values()
    read_values()

def store_values():
    riak_client = riak.RiakClient(host="localhost", http_port="8087", protocol="pbc")
    mapBucketType = riak.BucketType(riak_client, "maps")
    maps_bucket = riak.RiakBucket(riak_client, "sample_maps_bucket", mapBucketType)
    sample_map = Map(maps_bucket, "sample_map_key")
    sample_map.maps["Q1"].counters["a1"].increment(10)
    sample_map.maps["Q1"].counters["a2"].increment(13)
    sample_map.maps["Q2"].counters["a1"].increment(31)
    sample_map.maps["Q2"].counters["a2"].increment(21)
    sample_map.maps["Q2"].counters["a3"].increment(10)
    sample_map.store()

def read_values():
    riak_client = riak.RiakClient(host="localhost", http_port="8087", protocol="pbc")
    mapBucketType = riak.BucketType(riak_client, "maps")
    maps_bucket = riak.RiakBucket(riak_client, "sample_maps_bucket", mapBucketType)
    sample_map = Map(maps_bucket, "sample_map_key")
    sample_map.reload()
    results = {"sample_map_key": to_json(sample_map)}
    print results

def to_json(map):
        obj = {}
        for m in map.maps:
            if "maps" not in obj:
                obj["maps"] = {}
            obj["maps"][m] = to_json(map.maps[m])
        for c in map.counters:
            if "counters" not in obj:
                obj["counters"] = {}
            obj["counters"][c] = map.counters[c]
        return obj

if __name__ == '__main__':
    main()

完整追溯：

Traceback (most recent call last):   File "sampleMap.py", line 48, in <module>
    main()   File "sampleMap.py", line 5, in main
    read_values()   File "sampleMap.py", line 31, in read_values
    results = {"sample_map_key": to_json(sample_map)}   File "sampleMap.py", line 40, in to_json
    obj["maps"][m] = to_json(map.maps[m])   File "/usr/local/lib/python2.7/dist-packages/riak/datatypes/map.py", line 26, in __getitem__
    return self.map[(key, self.datatype)]   File "/usr/local/lib/python2.7/dist-packages/riak/datatypes/map.py", line 171, in __getitem__
    if key in self._value: TypeError: unhashable type: 'Map'

Answer 1

确定。我搞定了。似乎RIAK库和描述之间存在不一致。迭代map.maps并不是产生键而是值。但是，如果你迭代地图本身，你会得到键/类型。以下是工作代码：

from riak.datatypes import Map
import riak
def main():
    store_values()
    read_values()

def store_values():
    riak_client = riak.RiakClient(host="localhost", http_port="8087", protocol="pbc")
    mapBucketType = riak.BucketType(riak_client, "maps")
    maps_bucket = riak.RiakBucket(riak_client, "sample_maps_bucket", mapBucketType)
    sample_map = Map(maps_bucket, "sample_map_key")
    sample_map.maps["Q1"].counters["a1"].increment(10)
    sample_map.maps["Q1"].counters["a2"].increment(13)
    sample_map.maps["Q2"].counters["a1"].increment(31)
    sample_map.maps["Q2"].counters["a2"].increment(21)
    sample_map.maps["Q2"].counters["a3"].increment(10)
    sample_map.store()

def read_values():
    riak_client = riak.RiakClient(host="localhost", http_port="8087", protocol="pbc")
    mapBucketType = riak.BucketType(riak_client, "maps")
    maps_bucket = riak.RiakBucket(riak_client, "sample_maps_bucket", mapBucketType)
    sample_map = Map(maps_bucket, "sample_map_key")
    sample_map.reload()
    results = {"sample_map_key": to_json(sample_map)}
    print results

def to_json(map):
        obj = {}
        for m, type in map:
            if (type == "map"):
                if "maps" not in obj:
                    obj["maps"] = {}
                obj["maps"][m] = to_json(map.maps[m])

            if (type == "counter"):
                if "counters" not in obj:
                    obj["counters"] = {}
                obj["counters"][m] = map.counters[m].value
        return obj

if __name__ == '__main__':
    main()

RIAK - 数据类型 - python中的map用法

1 个答案: