mongo $lookup

Mongo Join

Example

Findone

Also findone

How to use MongoDBs aggregate `$lookup` as `findOne()`

So as you all know, find() returns an array of results, with findOne() returning just a simply object. With Angular, this makes a huge difference. Instead of going {{myresult[0].name}}, I can simply

https://stackoverflow.com/questions/37691727/how-to-use-mongodbs-aggregate-lookup-as-findone

$lookup (aggregation) - MongoDB Manual

Performs a left outer join to an unsharded collection in the same database to filter in documents from the "joined" collection for processing. To each input document, the stage adds a new array field whose elements are the matching documents from the "joined" collection. The stage passes these reshaped documents to the next stage.

https://docs.mongodb.com/manual/reference/operator/aggregation/lookup/

$lookup (aggregation) - MongoDB Manual

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