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我使用Mongoid來獲取Mongo數據庫中某些類型的記錄的計數。當運行使用JavaScript方法查詢:用Ruby/Javascript查詢Mongo組中的計數結果的區別
db.tags.group({
cond : { tag: {$ne:'donotwant'} },
key: { tag: true },
reduce: function(doc, out) { out.count += 1; },
initial: { count: 0 }
});
我得到如下結果:
[
{"tag" : "thing", "count" : 4},
{"tag" : "something", "count" : 1},
{"tag" : "test", "count" : 1}
]
不正是我想要它做的。然而,當我使用相應Mongoid代碼來執行相同的查詢:
Tag.collection.group(
:cond => {:tag => {:$ne => 'donotwant'}},
:key => [:tag],
:reduce => "function(doc, out) { out.count += 1 }",
:initial => { :count => 0 },
)
參數(貌似)作爲計數花車,而不是整數:
[
{"tag"=>"thing", "count"=>4.0},
{"tag"=>"something", "count"=>1.0},
{"tag"=>"test", "count"=>1.0}
]
我誤解背後有什麼回事場景?我需要(可以嗎?)投這些計數,或者是隻顯示沒有.0的javascript結果嗎?