![]() In such case $filter would need to be used in projection stage. Use the Select your language drop-down menu in the upper-right to set the language of the following examples. I'm using MongoDB Compass for my queries while searching through a lot of data that I've inherited and quite often being asked to produce reports on the data for various teams but the documents often have too much data for them to easily parse so I'd like to cut down the data being reported on as much. Click on the Validation tab and insert the following JSON schema to validate our documents. Now, letâs go into the mongodatabase and look at the documents inside the employees collection. A document looks like so:, ])Ī user review would be matched with all the replies where userReviewId equals to the _id of the user review and the replies field contains at least 1 approved reply. I am trying to perform a filter on a nested array of objects using aggregate, project, filter operators but I have not been successful yet in getting the expected output. filtering MongoDB array of Nested objects. Replace and with the username and password of the database user that you created.Each reply also has a status field which tells us whether a reply is approved or not to be displayed on the website. Suppose we have a collection named UserReview which contains reviews users made for a certain product and the documents also have a replies field which contains an array of comments made to a review. $elemMatch can be used in find operations. However, sometimes you may want to filter some field, specifically an array field by a certain condition. If you are using mongosh, see Iterate a Cursor in. To learn how to iterate through documents in a cursor, refer to your drivers documentation. ![]() ![]() ![]() The query results are not returned as an array of documents. Usually when you make queries in MongoDB, the returned result is the whole document with all the fields unless you make a projection. When you run a find operation with a MongoDB driver or mongosh, the command returns a cursor that manages query results. ![]()
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