使用 Mongo 查询数组元素
如何查询含有苹果的冰沙？ （以下是包含3个文档的集合）
_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
)
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
)
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如果您只是运行下面的查询，MongoDB 就会足够智能地找出您想要执行的操作。
Mongo 将看到配料是一个列表，并且只返回该列表中某些位置包含“apple”的文档。
If you simply run the below query MongoDB is smart enough to figure out what you're trying to do.
Mongo will see that ingredients is a list and only return documents that contain "apple" some where in that list.
来自文档：
From the documentation:
为什么人们要为冰沙编写可扩展的应用程序？
db.find({"配料":{$in: "苹果"}});
Why do people write scalable applications for smoothies?
db.find({"ingredients":{$in: "apple"}});