.catch()Execute a Waterline query instance using promises.
.catch(callback)
As of Sails v1 and Node.js v8, you can take advantage of
awaitinstead 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
awaitinstead 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.
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