用Mongo查询数组元素 [英] Querying array elements with Mongo

问题描述

如何查询其中装有苹果的冰沙? (下面是一个包含3个文档的集合)

How can I query the smoothies that have apple in them? (below is a collection with 3 documents)

_id => 1
name => 'best smoothie' 
ingredients => Array
    (
        [0] => apple
        [1] => raspberry
        [2] => orange
        [3] => banana
    )
_id => 2
name => 'summer smoothie' 
ingredients => Array
    (
        [0] => lemon
        [1] => mint

    )
_id => 3
name => 'yogurt smoothie' 
ingredients => Array
    (
        [0] => apple
        [1] => blueberry

    )

推荐答案

如果仅运行以下查询，MongoDB足够聪明，可以弄清楚您要做什么.

If you simply run the below query MongoDB is smart enough to figure out what you're trying to do.

{ ingredients: "apple" }

Mongo将看到成分是一个列表，并且仅返回列表中某些位置包含"apple"的文档.

Mongo will see that ingredients is a list and only return documents that contain "apple" some where in that list.

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