From:http://stackoverflow.com/questions/12629692/querying-an-array-of-arrays-in-mongodb

數據

db.multiArr.insert({"ID" : "fruit1","Keys" : [["apple", "carrot", "banana"]]}) db.multiArr.insert({"ID" : "fruit2","Keys" : [["apple", "orange", "banana"]]})db.multiArr.find({'Keys':{$elemMatch:{$elemMatch:{$in:['carrot']}}}}) { "_id" : ObjectId("506555212aeb79b5f7374cbf"), "ID" : "fruit1", "Keys" : [ [ "apple", "carrot", "banana" ] ] }db.multiArr.find({'Keys':{$elemMatch:{$elemMatch:{$in:['banana']}}}}){ "_id" : ObjectId("506555212aeb79b5f7374cbf"), "ID" : "fruit1", "Keys" : [ [ "apple", "carrot", "banana" ] ] } { "_id" : ObjectId("5065587e2aeb79b5f7374cc0"), "ID" : "fruit2", "Keys" : [ [ "apple", "orange", "banana" ] ] }

查詢語句：

Interesting question, This will do the trick

db.multiArr.find({'Keys':{$elemMatch:{$elemMatch:{$in:['carrot']}}}})
$elemMatch used to check if an element in an array matches the specified match expression. so nested $elemMatch will go deeper into nested arrays

?

補充:

http://stackoverflow.com/questions/17360423/getting-a-dictionary-inside-a-list-by-key-in-mongodb-mongoengine

轉載于:https://www.cnblogs.com/colipso/p/4431343.html

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