.catch()
Execute a Waterline query instance using promises.
.catch(callback)
As of Sails v1 and Node.js v8, you can take advantage of
await
instead of using this method.
Argument | Type | Details | |
---|---|---|---|
1 | filter | An optional dictionary whose properties will be checked against the error. If they all match, then the callback will run. Otherwise, it won't. | |
2 | callback | A function that runs if the query fails. Takes the error as its argument. |
Argument | Type | Details | |
---|---|---|---|
1 | err | The Error that occurred, or undefined if there were no errors. |
To look up the user with the specified email address:
User.findOne({
email: req.param('email')
})
.then(function (user){
if(!user) { return res.notFound(); }
return res.json(user);
})
// If there was some kind of usage / validation error
.catch({ name: 'UsageError' }, function (err) {
return res.badRequest(err);
})
// If something completely unexpected happened.
.catch(function (err) {
return res.serverError(err);
});
- Whenever possible, it is recommended that you use
await
instead of calling this method.- This is an alternative to
.exec()
. When combined with.then()
, it provides the same functionality.- The
.catch()
function also returns a promise to allow for chaining. This is not recommended for any but the most advanced users of promises due to the complex (and arguably non-intuitive) behavior of chained.catch()
calls.- For more information, see the bluebird
.catch()
api docs.