mongodb : 查询嵌套字符串数组

Question

我有一个类似

的对象列表

[
   { item: "journal", instock: [ { warehouse: "A", qty: 5 }, { warehouse: "C", qty: 15, type : ["hello", "world", "wassup", "yo"] } ] },
   { item: "notebook", instock: [ { warehouse: "C", qty: 5 } ] },
   { item: "paper", instock: [ { warehouse: "A", qty: 60 }, { warehouse: "B", qty: 1515, type : ["hello", "wassup", "yo"] } ] },
   { item: "planner", instock: [ { warehouse: "A", qty: 40 }, { warehouse: "B", qty: 515, type : ["hello"] } ] },
   { item: "postcard", instock: [ { warehouse: "B", qty: 15 }, { warehouse: "C", qty: 3515, type : ["wassup", "yo"] } ] }
]

如何查询"type"包含hello

的所有仓库列表

db.inventory.find( { "instock": { $elemMatch: {type :["hello"]}}} , {_id:0})

returns只有hello的对象

Answer 1

Dot notation 在这种情况下有效，尝试：

db.collection.find({ "instock.type": "hello"})

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