Update embedded object inside array inside array in MongoDB

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You can only use the $ positional operator for single-level arrays. In your case, you have a nested array (heros is an array, and within that each hero has a spells array).

If you know the indexes of the arrays, you can use explicit indexes when doing an update, like:

> db.test.update({"heros.nickname":"test", "heros.spells.spell_id":1}, {$set:{"heros.0.spells.1.level":3}});

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