population and deep paths (3.6.0rc0)

[Marco Kaiser]

Hi,

I've been trying to get nested population work in 3.6.0rc0, but without luck.

I have a Schema A which has a collection of references to Schema B, and Schema B has a reference to a single document of Schema C:

var SchemaA = new Schema({ bs: [ { type: Schema.Types.ObjectId, ref: 'B' } ] });
var SchemaB = new Schema({ c: { type: Schema.Types.ObjectId, ref: 'B' } });
var SchemaC = new Schema({ ... });


var ModelA = mongoose.model('A', SchemaA);
var ModelB = mongoose.model('B', SchemaB);
var ModelC = mongoose.model('C', SchemaC);

 Now, I want to findOne of A, then populate the array of B in that one, and also the Cs in all the Bs. That's what I am trying:

ModelA.findOne({ ... }).populate('bs').populate('bs.c').exec( ... );

But I get an exception:

/home/marco/code/app/node_modules/mongoose/lib/model.js:1830
      foundschema = schema.path(trypath);
                           ^
TypeError: Cannot call method 'path' of undefined
    at search (/home/marco/code/app/node_modules/mongoose/lib/model.js:1830:28)
    at search (/home/marco/code/app/node_modules/mongoose/lib/model.js:1849:22)
    at Function._getSchema (/home/marco/code/app/node_modules/mongoose/lib/model.js:1856:5)
    at populate (/home/marco/code/app/node_modules/mongoose/lib/model.js:1594:22)
    at Function.Model.populate (/home/marco/code/app/node_modules/mongoose/lib/model.js:1573:5)
    at model.populate (/home/marco/code/app/node_modules/mongoose/lib/document.js:256:22)
    at Promise.WantController.show (/home/marco/code/app/routes/want.js:21:11)
    at Promise.onResolve (/home/marco/code/app/node_modules/mongoose/node_modules/mpromise/lib/promise.js:162:8)
    at Promise.EventEmitter.emit (events.js:96:17)
    at Promise.emit (/home/marco/code/want/node_modules/mongoose/node_modules/mpromise/lib/promise.js:79:38)

Any suggestions or hints at what I am doing wrong? Unfortunately, there isn't much documentation for this new feature yet...

Thanks in advance! 

[Aaron Heckmann]

Populating references spanning more than two collections must be done manually using Model.populate(docs, options, callback).

ModelA.findOne({ ... }).populate('bs').exec(function (err, doc) {

  ModelB.populate(doc, 'c', function (err, doc) {

    console.log(doc.bs.c)

https://github.com/LearnBoost/mongoose/wiki/3.6-pre-release-notes

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[Marco Kaiser]

Thanks Aaron, that works!

Marco

[Felipe Lorenzo VI]

Hi,

What if I want to populate ModelB from find({...}) which returns an array instead of findOne()?

[Aaron Heckmann]

Model.populate supports arrays too.

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@aaronheckmann

[styb...@gmail.com]

How do you use field selection on the second populate?

ModelA.findOne({ ... }).populate('bs').exec(function (err, doc) {

  ModelB.populate(doc, 'c', '_id', function (err, doc) {

    console.log(doc.bs.c)

Doesnt work.

On Tuesday, March 5, 2013 6:39:17 PM UTC+1, Aaron Heckmann wrote:

Populating references spanning more than two collections must be done manually using Model.populate(docs, options, callback).

ModelA.findOne({ ... }).populate('bs').exec(function (err, doc) {

  ModelB.populate(doc, 'c', function (err, doc) {

    console.log(doc.bs.c)

https://github.com/LearnBoost/mongoose/wiki/3.6-pre-release-notes

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[Anthony Ettinger]

This is how i do it. use an object { path: 'creator', select: '-salt -hashedPassword' }

newJob.save(function (err, job) {

                 if (err) return res.json(400, err);

Job.populate(job, { path: 'creator', select: '-salt -hashedPassword -email' }, function(err, job){

job = utils.getJobPerms(job, user);

job = utils.job.getCreatorProfile(job);

res.json(job);

})

    });

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