1. This method accepts the same options as Document#toObject . .promisifyAll() method is nearly-universal in Node.JS world – you can use it on anything providing asynchronous functions taking in callback as their last argument. See Query.prototype.lean() for more information. Getter/setter around the current mongoose-specific options for this query Below are the current Mongoose-specific options. You can find the return type of specific operations in the api docs You can also read more about promises in Mongoose. We'll be covering basic CRUD (Create, Read, Update, Delete) operations. Promise.promisifyAll(mongoose); Makes all mongoose (and its models) methods available as functions returning promises, with Async suffix (.exec() becomes .execAsync(), and so on). Populated paths are no longer set to their original _id, their value is replaced with the mongoose document returned from the database by performing a separate query before returning the results. I'm new programming in Node and I'm stuck because I no understand exactly what is the difference between .find and .exec. Mongoose find vs exec.

populate: an array representing what paths will be populated.Should have one entry for each call to Query.prototype.populate(); lean: if truthy, Mongoose will not hydrate any documents that are returned from this query. Mongoose models provide several static helper functions for CRUD operations.Each of these functions returns a mongoose Query object. I'll let @vkarpov15 chime in though on whether or not that's a feature worth exploring. With Mongoose, you can perform This means that you can do things like MyModel.findOne({}).then() and await MyModel.findOne({}).exec() if you're using async/await. Ask Question Asked 1 year, 8 months ago. To apply the options to every document of your schema by default, set your schemas toJSON option to the same argument. How to return values. Viewed 2k times 0. Making it return null would be a huge backwards breaking change and probably not ideal since you would want to know if the value being passed in is not being cast properly. Active 1 year, 1 month ago. Model.deleteMany() Model.deleteOne() Model.find() Model.findById() Model.findByIdAndDelete() Model.findByIdAndRemove()

The return value of this method is used in calls to JSON.stringify(doc). Mongoose async operations, like .save() and queries, return thenables.

We've covered the basics of making queries in the MongoDB Shell, but since we'll mostly be writing our queries in our server's JavaScript code using Mongoose, it makes sense to understand how Mongoose does queries. Arrays of refs work the same way.