In this case we have Users, with an array of friends that are other Users. Closed aheckmann closed this Apr 9, 2013.

24 January 2016 — Josh Beam — mongodb All Posts. 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.

Getter/setter around the current mongoose-specific options for this query Below are the current Mongoose-specific options.

Mongoose populate works charm when reference an another collection document but what if i want to reference a document array with their id. But somehow the query method doesn't populate the teachers collection.

Every string has an id of a document from the Location collection (LocationsSchema), because we gave reference to it earlier. The weird thing is that i don't even get the collection with object ids and it returns and institute with empty teacher array. When using mongoose-uuid2 for the _id on records, arrays of referenced ids are not populated when using.populate (…) on a query. Copy link Quote reply raugaral commented Nov 9, 2016 • edited I have the next mongoose Schema. In this case, the key is comments. I know thier are other ways of doing it. When I populate the tags array it is of course populated with tag object literals. Implementing .Populate() Let’s have a look at the function. Query an Array with Compound Filter Conditions on the Array Elements¶. findById ... Can't make nested populate in new mongoose 3.6rc0 #1377.

const ryu = await Characters.findOne({ name: 'Ryu' }) const specials = ryu.specials console.log(specials) This specials array is a normal JavaScript array. Thanks for contributing an answer to Stack Overflow! I'm testing out an idea and have made some contrived examples for discussion. I have tried only specifying the name, but then name is returned within an object literal. Mongoose allows you to fetch linked documents with the populate method.

The first field is the name of the employee.

Home; About; Reading List; Understanding Mongoose Deep Population. Populating multiple existing documents.

See Query.prototype.lean() for more information.

What you need to do is call .populate when you execute with findOne.

(Note: Mongoose calls this the key a “path”). As you can see, the we're using the populate function of mongoose to join the documents when querying for Posts. When you call populate, you need to pass in the key of the property you want to populate. Mongoose documents behave like regular JavaScript objects. Below is a simple example they have provided for populating across multiple levels. I'm trying to populate the creator ref for each stories saved, I tried the both path : Person.

The following example queries for documents where the dim_cm array contains elements that in some combination satisfy the query conditions; e.g., one element can satisfy the greater than 15 condition and another element can satisfy the less than 20 condition, or a single element can satisfy both:

But embedded documents make more sense in mongodb. Mongoose provides great documentation for how to get started with populating arrays.