與數組項MongoDB中

的模式不爲空的我的文檔查找項目是這樣的：與數組項MongoDB中

history: { type: [Object] }

我想找到那些在數組中的第15點中的項目的所有文件。

我希望將工作的查詢是：

db.getCollection('teams').find({'history.15': {$exists: true}})

但如果history.15爲null，它仍然會返回文檔這不是我想要的。所以簡單的辦法應該這樣做：

db.getCollection('teams').find({'history.15': {$exists: true, $ne: null}})

但這並不返回任何對象（也有在我的數據庫有非空的15項數組對象）。

任何想法如何讓這個查詢工作？

更新：這裏是不是被我的查詢找到了一個樣本文件：

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    "_id" : "FR5BTtggnbxRrDqi3", 
    "history" : [ 
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}

來源

2016-12-13 Eliezer Steinbock

似乎是爲我工作。有沒有一種方法可以添加用於測試的示例數據？只是一個基於零的索引。 – Veeram

這也適用於我。我猜想問題是'history.15'需要'history.14'。 – therealrootuser

我已經添加了一個應該通過測試的示例文檔，與索引一起玩並不適合我。 –

因此簡化回答了一下，說我們的一個數組a數據的3個不同位：

> db.test.find() 
{ "_id" : ObjectId("585145ee8b5e4bf7a33373ee"), "a" : [ { "i" : 0 }, { "i" : 1 } ] } 
{ "_id" : ObjectId("585145f68b5e4bf7a33373ef"), "a" : [ { "i" : 0 }, { "i" : 1 }, null ] } 
{ "_id" : ObjectId("585146038b5e4bf7a33373f0"), "a" : [ { "i" : 0 }, { "i" : 1 }, { "i" : 2 } ] }

爲了簡單起見，在這個例子中，我們將檢查2的指數，我們可以做到這一點使用聚合框架：

var index = 2; 

db.test.aggregate([ 
    { $project: { indexValue: { $arrayElemAt: [ '$a', index ] } } }, 
    { $match: { 'indexValue' : { $ne: null } } } 
])

這一操作將輸出以下內容：

{ "_id" : ObjectId("585146038b5e4bf7a33373f0"), "indexValue" : { "i" : 2 } }

符合你的標準，但如果你

db.test.find({ 'a.2' : { $ne: null } })

它不符合的文件，猜測這是事做訪問古怪足夠數組的索引？

反正匹配null，沒有現有文檔的更多信息，請參見 - https://docs.mongodb.com/manual/tutorial/query-for-null-fields/#equality-filter

來源

2016-12-14 14:06:11

與數組項MongoDB中

回答

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