Error in function does not pass test - mongodb

Question

I'm learning about MongoDb and the exercise of the module is about a function in MongoDb to return the match in the database with the parameter "Director" that I pass but doesn't pass the test. This is my code:
In movies.js
exports.byDirector = function(db, director, callback) {
// TODO: implement
db.collection('movies').find(
{"director" : director}).sort({title : 1}).toArray(function(error, docs){
if (error){
console.log(error);
process.exit(1);
}
docs.forEach(function(doc){
console.log(JSON.stringify(doc));
});
process.exit(0);
})
callback(null, []);
};
This is the function's test:
it('returns multiple results ordered by title', function(done) {
dbInterface.byDirector(db, 'George Lucas', function(error, docs) {
assert.ifError(error);
assert.ok(Array.isArray(docs));
assert.equal(docs.length, 4);
assert.equal(docs[0].title, 'Attack of the Clones');
assert.equal(docs[1].title, 'Revenge of the Sith');
assert.equal(docs[2].title, 'Star Wars');
assert.equal(docs[3].title, 'The Phantom Menace');
docs.forEach(function(doc) {
delete doc._id;
});
assert.deepEqual(Object.keys(docs[0]), ['title', 'year', 'director']);
++succeeded;
georgeLucasMovies = docs;
done();
});
});
var succeeded = 3;
What's wrong?
Thank you so much for your help.

Answer 1

You are calling the callback function outside the toArray callback function
Try this
exports.byDirector = function(db, director, callback) {
// TODO: implement
db.collection('movies').find(
{"director" : director}).sort({title : 1}).toArray(function(error, docs){
if (error){
callback(err, null);
}
docs.forEach(function(doc){
console.log(JSON.stringify(doc));
});
callback(null, docs);
});
};