Saving multiple documents with Mongoose and doing something when last one is saved
A useful library to coordinate asynchronous operations is async
. In your case, the code would look something like this:
var people = [ person1, person2, person3, person4, ... ];
async.eachSeries(people, function(person, asyncdone) {
person.save(asyncdone);
}, function(err) {
if (err) return console.log(err);
done(); // or `done(err)` if you want the pass the error up
});
Using promises and Array.map()
const userPromises = persons.map(user => {
return new Promise((resolve, reject) => {
person.save((error, result) => {
if (error) {
reject(error)
}
resolve(result);
})
})
});
Promise.all(userPromises).then((results) => {
//yay!
//results = [first, second, etc...]
}, (error) => {
//nay!
})
I would recommend to have an array and save with iteration. Will have same performance but code would be cleaner.
You can have
var Person = mongoose.model('Person');
var people = [];
people[0] = new Person({id: 'someid'});
people[0].set('name', 'Mario');
people[1] = new Person({id: 'someid'});
people[1].set('name', 'Mario');
people[2] = new Person({id: 'someid'});
people[2].set('name', 'Mario');
var errors = [];
for(person in people){
people[person].save(function(err, done){
if(err) errors.push(err);
if (person === people.length){ yourCallbackFunction(errors){
if (errors.length!=0) console.log(errors);
//yourcode here
};
}
});
}