mongoose populate filter
Story.
find(...).
populate({
path: 'fans',
// filtering field, you can use mongoDB syntax
match: { age: { $gte: 21 } },
// Explicitly exclude `_id`, see http://bit.ly/2aEfTdB
select: 'name -_id'
}).
exec();ref in mongoose example
var mongoose = require('mongoose')
, Schema = mongoose.Schema
var eventSchema = Schema({
title : String,
location : String,
startDate : Date,
endDate : Date
});
var personSchema = Schema({
firstname: String,
lastname: String,
email: String,
gender: {type: String, enum: ["Male", "Female"]}
dob: Date,
city: String,
interests: [interestsSchema],
eventsAttended: [{ type: Schema.Types.ObjectId, ref: 'Event' }]
});
var Event = mongoose.model('Event', eventSchema);
var Person = mongoose.model('Person', personSchema);mongoos populate a ref
const storySchema = Schema({
authors: [{ type: Schema.Types.ObjectId, ref: 'Person' }],
title: String
});
// Later
const story = await Story.findOne({ title: 'Casino Royale' }).populate('authors');
story.authors; // `[]`mongoose (populate)
// The 2nd `populate()` call below overwrites the first because they
// both populate 'fans'.
Story.
find().
populate({ path: 'fans', select: 'name' }).
populate({ path: 'fans', select: 'email' });
// The above is equivalent to:
Story.find().populate({ path: 'fans', select: 'email' });Copyright © 2021 Codeinu
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