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.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.
Usage
| 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. |
Callback
| Argument | Type | Details | |
|---|---|---|---|
| 1 | err | The Error that occurred, or undefined if there were no errors. |
Example
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);
});
Notes
- 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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Reference
- Application
- Blueprint API
- Command-line interface
-
Configuration
- sails.config.*
- sails.config.blueprints
- sails.config.bootstrap()
- sails.config.custom
- sails.config.datastores
- sails.config.globals
- sails.config.http
- sails.config.i18n
- sails.config.log
- sails.config.models
- sails.config.policies
- sails.config.routes
- sails.config.security
- sails.config.session
- sails.config.sockets
- sails.config.views
-
Request (`req`)
- req._startTime
- req.body
- req.cookies
- req.fresh
- req.headers
- req.hostname
- req.ip
- req.ips
- req.isSocket
- req.method
- req.options
- req.originalUrl
- req.params
- req.path
- req.protocol
- req.query
- req.secure
- req.signedCookies
- req.socket
- req.subdomains
- req.url
- req.wantsJSON
- req.xhr
- req.accepts()
- req.acceptsCharsets()
- req.acceptsLanguages()
- req.allParams()
- req.file()
- req.get()
- req.is()
- req.param()
- req.setLocale()
- req.setTimeout()
- req.host
- Response (`res`)
- Waterline (ORM)
- WebSockets
Reference
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