mongoose index not work, when use mocha - node.js

Question

My project files:
I have a User model:
user.model.js
var UserSchema = new Schema({
username: { type: String, required: true, unique: true },
location: { 'type': {type: String, enum: "Point", default: "Point"}, coordinates: { type: [Number], default: [0,0]} },
});
UserSchema.index({location: '2dsphere'});
And have an Express route:
user.route.js
function create(req, res) {
User.create(req.body, function(err, user) {
if (err) return res.send(err);
return res.send(user);
})
}
user.test.js
describe('test_user', function() {
it('create user', function(done) {
request('http://localhost/user')
.post('/')
.send({
username: 'john',
password: "123"
})
.end(function(err, res) {
if (err) cb(err);
done()
});
});
});
I have a drop_databse.js file, it run every time before run test:
drop_databse.js
var MongoClient = require('mongoose/node_modules/mongodb').MongoClient
MongoClient.connect('mongodb://localhost/miccity_test', function(err, db) {
if (err) return console.log(err);
db.dropDatabase(function(err) {
if (err) return console.log('drop databse failed!! :\n' + err);
db.close();
})
})
when I test
when I run test:
$ node drop_database.js && mocha
test_user
✓ create user
1 passing (21ms)
But, I notice user collection in database has not index of location field !
But I create a single file:
test.js
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
mongoose.connect('mongodb://localhost/miccity_test');
var db = mongoose.connection;
db.on('error', console.error.bind(console, 'mongodb connection error:'));
var UserSchema = new Schema({
username: { type: String, required: true, unique: true },
location: { 'type': {type: String, enum: "Point", default: "Point"}, coordinates: { type: [Number], default: [0,0]} },
});
UserSchema.index({location: '2dsphere'});
var User = mongoose.model('User', UserSchema);
User.create({username: "test"}, function (err) {
if (err) console.log(err);
})
And run: node drop_databse.js && node test.js, then i check the index of location, it exist!
Is it mean mocha can not create index of collection?
Edit:
i found the trick way:
use Model.ensureIndexes to Sends ensureIndex commands to mongo for each index declared in the schema.
function create(req, res) {
User.ensureIndexes(function(err){
User.create(req.body, function(err, user) {
if (err) return res.send(err);
return res.send(user);
})
}
it is maybe a bug for mongoose, I already submit this issue to github.