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();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' });populate example in mongoose
const Live = new Schema(
{
user_id:{ // this one populate
type: Schema.Types.ObjectId,
ref: 'User', // User Schema
required: true
},
title: {
type: String,
},
category:{ // this one populate
type: Schema.Types.ObjectId,
ref: 'Category' // Category Schema
},
}
)
let vid = await Live.find({})
.populate({path:'user_id',select:'name image -_id'})
.populate({path:'category',select:'category -_id',model:Category})Copyright © 2021 Codeinu
Forgot your account's password or having trouble logging into your Account? Don't worry, we'll help you to get back your account. Enter your email address and we'll send you a recovery link to reset your password. If you are experiencing problems resetting your password contact us
