tornado-motor – Tarik Billa

MongoDB return True if document exists

August 12, 2023 by Tarik

Note: This answer is outdated. More recent versions of MongoDB can use the far more efficient method db.collection.countDocuments. See the answer by Xavier Guihot for a better solution. find doesn’t return a boolean value, it returns a cursor. To check if that cursor contains any documents, use the cursor’s count method: if db.mycollection.find({‘UserIDS’: { “$in”: … Read more

How to hide _id from Aggregation?

July 30, 2023 by Tarik

From mongodb docs You can $project the results to exclude the _id – is this what you mean? http://docs.mongodb.org/manual/reference/aggregation/#pipeline Note The _id field is always included by default. You may explicitly exclude _id as follows: db.article.aggregate( { $project : { _id : 0 , title : 1 , author : 1 }} ); From you’re … Read more