Querying For Array In Embedded List

Supposed I have a mongo document that looks similar to the following: { 'foo':1 'listOfLists' : [ [1,2],[3,4] ] } (Yes I am aware this isn't how it 'really' looks but it sho

Solution 1:

collection.find({ 'listsOfLists': [3,4] }).

It's just a "direct match" on the property. MongoDB will look at each array element automatically. You don't need $elemMatch here.

If you were to use it, you need an operator expression, such as $eq:

collection.find({ 'listsOfLists': { '$elemMatch': { '$eq': [3,4] } } }).

But that of course is not required unless there are "two or more" conditions that actually need to match on the array elements. Which is what $elemMatch is actually for.