I don’t know where you read about that .exclude function, because I can’t find it in any documentation. With mongoose is it possible to exclude fields when populating without select chaining? Because a Mongoose query requests all fields of a document by default, every site visitor will cause it to request and parse the entire list of comments. I have a User model with password field and I want to exclude this field. A mongoose query can be executed in one of two ways. First, if you pass in a callback function, Mongoose will execute the query asynchronously and pass the results to the callback . #### Beware: Mongoose fetches all fields by default The culprit is the **comments** field. A query also has a .then() function, and thus can be used as a promise.
Here is an example from the official documentation: db.inventory.find( { type: 'food' }, { type:0 } ) This page provides examples in: By default, queries in MongoDB return all fields in matching documents. But you can exclude fields by using the second parameter of the find method. Starting in MongoDB 3.6, you can use the variable REMOVE in aggregation expressions to conditionally suppress a field. To limit the amount of data that MongoDB sends to applications, you can include a projection document to specify or restrict fields to return. Project Fields to Return from Query¶. Even when you’re the only one browsing your blog, it just won’t feel as snappy anymore. MongoDB Exercise - Display specific fields and exclude the field _id for all the documents in the collection Last update on February 26 2020 08:08:08 (UTC/GMT +8 hours) Write a MongoDB query to display the fields restaurant_id, name, borough and cuisine, but exclude the field _id for all the documents in the collection restaurant. Now, at times, we may not want all the records from the collection but a …
By default, when we query any collection in MongoDB, it returns all fields in matching documents. Every time. Thanks. MongoDB Projection helps to return the specific fields from the query (or you can say from the MongoDB collection). Conditionally Exclude Fields¶ New in version 3.6.
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