MongoCollectionFindOne

returns the first document in MongoCollection.

returns the first document matching the query query.

the fields included in the document are controlled by projection.

Details and Options

To use MongoCollectionFindOne, you first need to load MongoLink using Needs["MongoLink`"].
Both query and projection are Associations.
See "Query and Projection Operators" in the MongoDB documentation for available query and projection operators.
MongoCollectionFindOne corresponds to db.collection.findOne() in the MongoDB documentation.
See also the "Query Documents" and "Project Fields to Return from Query" tutorials in the MongoDB documentation.

Connect to a client:

Connect to a the "WolframTestCollection" collection in the "WolframTestDB" database:

Find the first document in the collection:

Find the first document in the collection that matches the query <|"age"5|>:

Find the first document in the collection that matches the query <|"age"4|>, without returning the "date" field:

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