How to return partial array match in inner array of mongodb?

@filiberto 

To return a partial array match in an inner array of MongoDB, you can use the $elemMatch operator in conjunction with projection to only return the matched elements.

For example, if you have a collection called "products" with documents that contain an array field called "variants", and you want to retrieve only the variants that match a certain condition, you can use the following query:

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db.products.find(
   { },
   { variants: { $elemMatch: { size: 'small' } } }
)

This query will return only the variants that have a size of 'small' in the "variants" array of each document in the "products" collection. You can adjust the condition inside $elemMatch to match your specific criteria.

Remember to replace the collection name ("products"), field name ("variants"), and condition ("size: 'small'") with your actual document structure and search criteria.