How to change http status codes in Strongloop Loopback - rest

Question

I am trying to modify the http status code of create.
POST /api/users
{
"lastname": "wqe",
"firstname": "qwe",
}
Returns 200 instead of 201
I can do something like that for errors:
var err = new Error();
err.statusCode = 406;
return callback(err, info);
But I can't find how to change status code for create.
I found the create method:
MySQL.prototype.create = function (model, data, callback) {
var fields = this.toFields(model, data);
var sql = 'INSERT INTO ' + this.tableEscaped(model);
if (fields) {
sql += ' SET ' + fields;
} else {
sql += ' VALUES ()';
}
this.query(sql, function (err, info) {
callback(err, info && info.insertId);
});
};

Answer 1

In your call to remoteMethod you can add a function to the response directly. This is accomplished with the rest.after option:
function responseStatus(status) {
return function(context, callback) {
var result = context.result;
if(testResult(result)) { // testResult is some method for checking that you have the correct return data
context.res.statusCode = status;
}
return callback();
}
}
MyModel.remoteMethod('create', {
description: 'Create a new object and persist it into the data source',
accepts: {arg: 'data', type: 'object', description: 'Model instance data', http: {source: 'body'}},
returns: {arg: 'data', type: mname, root: true},
http: {verb: 'post', path: '/'},
rest: {after: responseStatus(201) }
});
Note: It appears that strongloop will force a 204 "No Content" if the context.result value is falsey. To get around this I simply pass back an empty object {} with my desired status code.

Answer 2

You can specify a default success response code for a remote method in the http parameter.
MyModel.remoteMethod(
'create',
{
http: {path: '/', verb: 'post', status: 201},
...
}
);

Answer 3

For loopback verion 2 and 3+: you can also use afterRemote hook to modify the response:
module.exports = function(MyModel) {
MyModel.afterRemote('create', function(
context,
remoteMethodOutput,
next
) {
context.res.statusCode = 201;
next();
});
};
This way, you don't have to modify or touch original method or its signature. You can also customize the output along with the status code from this hook.