Database IntegrationLesson 63Free preview

MongoDB Find

This lesson is part of Node.js · All levels

Summary

This lesson discusses reading MongoDB data from Node.js with find(), find().findOne(), and converting the results to arrays. Cursors support chaining such as sort(), limit(), and project() to filter out results. It's also important to understand ObjectId so that a search based on _id doesn't fail.

Key points

Find(filter) returns the cursor; toArray() pulls all the matching results.
Returns a document or a unique field, suitable for searching by _id.
Import the objectId from the mongodb module to search for the objectId type.
Chaining limit(), skip(), sort(), project() sets the number, sequence, and column of results.
An empty filter means taking all the documents; be careful with the large collection.

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