deno.land / x / mongoose@6.7.5 / examples / promises / promise.js
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const async = require('async');
// import the rest of the normal stuffconst mongoose = require('../../lib');
require('./person.js')();
const Person = mongoose.model('Person');
// define some dummy dataconst data = [ { name: 'bill', age: 25, birthday: new Date().setFullYear((new Date().getFullYear() - 25)) }, { name: 'mary', age: 30, birthday: new Date().setFullYear((new Date().getFullYear() - 30)) }, { name: 'bob', age: 21, birthday: new Date().setFullYear((new Date().getFullYear() - 21)) }, { name: 'lilly', age: 26, birthday: new Date().setFullYear((new Date().getFullYear() - 26)) }, { name: 'alucard', age: 1000, birthday: new Date().setFullYear((new Date().getFullYear() - 1000)) }];
mongoose.connect('mongodb://localhost/persons', function(err) { if (err) { throw err; }
// create all of the dummy people async.each(data, function(item, cb) { Person.create(item, cb); }, function(err) { if (err) { // handle error }
// create a promise (get one from the query builder) const prom = Person.find({ age: { $lt: 1000 } }).exec();
// add a callback on the promise. This will be called on both error and // complete prom.addBack(function() { console.log('completed'); });
// add a callback that is only called on complete (success) events prom.addCallback(function() { console.log('Successful Completion!'); });
// add a callback that is only called on err (rejected) events prom.addErrback(function() { console.log('Fail Boat'); });
// you can chain things just like in the promise/A+ spec // note: each then() is returning a new promise, so the above methods // that we defined will all fire after the initial promise is fulfilled prom.then(function(people) { // just getting the stuff for the next query const ids = people.map(function(p) { return p._id; });
// return the next promise return Person.find({ _id: { $nin: ids } }).exec(); }).then(function(oldest) { console.log('Oldest person is: %s', oldest); }).then(cleanup); });});
function cleanup() { Person.remove(function() { mongoose.disconnect(); });}
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