Class 11 & 12 ORM - edpuzino/seattle-javascript-401n7 GitHub Wiki

Populate in Middleware

• You can populate in either pre or post hooks. If you want to always populate a certain field, check out the mongoose-autopopulate plugin.

// Always attach populate() to find() calls

MySchema.pre('find', function() {

this.populate('user');

});

// Always populate() after find() calls. Useful if you want to selectively populate

// based on the docs found.

MySchema.post('find', async function(docs) {

for (let doc of docs) {

if (doc.isPublic) {

  await doc.populate('user').execPopulate();

}

}

});

// populate() after saving. Useful for sending populated data back to the client in an

// update API endpoint

MySchema.post('save', function(doc, next) {

doc.populate('user').execPopulate().then(function() {

next();

});

});