Joe Joe - 28 days ago 9
Node.js Question

Mongoose populating array of subdocuments

Apologies if this has already been asked, my searches did not turn up the same situation. I have two schemas something like the below:

var experimentSchema = new mongoose.Schema({

name : 'string'
elements : [{
type : mongoose.Schema.ObjectId,
ref: 'Element'
}],
resources : [{
type : mongoose.Schema.ObjectId,
ref : 'Resource'
}],

})


var elementSchema = new mongoose.Schema({
name : 'string',
component : {
type : mongoose.Schema.ObjectId,
ref : 'Component'
}
})


I want to perform a deep population so that when I request an experiment I get an object with an array of
elements
and
resources
and for each of the elements the field
component
has also been populated.

I have tried a few things along the lines of:

Experiment.findOne(query).populate(['resources','elements','elements.component']).exec(...)


without success. Can anyone provide the correct syntax for this type of operation?

Thanks in advance!

Answer

hope this helps.

models.User.findOne(query)
      .populate([{
        path: 'elements',
        populate: { 
             path:  'components', 
             model: 'Component'
            }
      },{
        path:'resources'
      }])
      .exec(...)
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