Edit Page

res.negotiate()

Given an error (err), attempt to guess which error response should be called (badRequest, forbidden, notFound, or serverError) by inspecting the status property. If err is not a dictionary, or the status property does not match a known HTTP status code, then default to serverError.

Especially handy for handling potential validation errors from Model.create() or Model.update().

Usage

return res.negotiate(err);

Details

Like the other built-in custom response modules, the behavior of this method is customizable.

res.negotiate() examines the provided error (err) and determines the appropriate error-handling behavior from one of the following methods:

  • res.badRequest() (400)
  • res.forbidden() (403)
  • res.notFound() (404)
  • res.serverError() (500)

The determination is made based on err's "status" property. If a more specific diagnosis cannot be determined (e.g. err doesn't have a "status" property, or it's a string), Sails will default to res.serverError().

Example

// Add Fido's birthday to the database:
Pet.update({name: 'fido'})
  .set({birthday: new Date('01/01/2010')})
  .exec(function (err, fido) {
    if (err) return res.negotiate(err);
    return res.ok(fido);
   });

Notes

  • This method is terminal, meaning it is generally the last line of code your app should run for a given request (hence the advisory usage of return throughout these docs).
  • res.negotiate() (like other userland response methods) can be overridden - just define a response module (/responses/negotiate.js) and export a function definition.
  • This method is used as the default handler for uncaught errors in Sails. That means it is called automatically if an error is thrown in any request handling code, but only within the initial step of the event loop. You should always specifically handle errors that might arise in callbacks/promises from asynchronous code.

Is something missing?

If you notice something we've missed or could be improved on, please follow this link and submit a pull request to the sails-docs repo. Once we merge it, the changes will be reflected on the website the next time it is deployed.

Sails logo
  • Home
  • Get started
  • Support
  • Documentation
  • Documentation

For a better experience on sailsjs.com, update your browser.

Documentation

Reference Concepts App structure | Upgrading Contribution guide | Tutorials More

Reference

  • Application
    • Events
    • Lifecycle
    • sails.getRouteFor()
    • sails.getUrlFor()
    • sails.lift()
    • sails.load()
    • sails.log()
    • sails.lower()
    • sails.request()
    • sails.getBaseUrl()
  • Blueprint API
    • add to
    • create
    • destroy
    • find one
    • find where
    • populate where
    • remove from
    • update
  • Command Line Interface
    • sails console
    • sails debug
    • sails generate
    • sails lift
    • sails new
    • sails version
  • Configuration
    • sails.config.*
    • sails.config.blueprints
    • sails.config.bootstrap()
    • sails.config.connections
    • sails.config.cors
    • sails.config.csrf
    • sails.config.globals
    • sails.config.http
    • sails.config.i18n
    • sails.config.log
    • sails.config.models
    • sails.config.policies
    • sails.config.routes
    • sails.config.session
    • sails.config.sockets
    • sails.config.views
  • Request (`req`)
    • req.accepted
    • req.acceptedCharsets
    • req.acceptedLanguages
    • req.body
    • req.cookies
    • req.fresh
    • req.headers
    • req.host
    • req.ip
    • req.ips
    • req.isSocket
    • req.method
    • req.options
      • req.options.values
      • req.options.where
    • 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.acceptsCharset()
    • req.acceptsLanguage()
    • req.allParams()
    • req.file()
    • req.get()
    • req.is()
    • req.param()
  • Response (`res`)
    • res.attachment()
    • res.badRequest()
    • res.clearCookie()
    • res.cookie()
    • res.created()
    • res.forbidden()
    • res.get()
    • res.json()
    • res.jsonp()
    • res.location()
    • res.negotiate()
    • res.notFound()
    • res.ok()
    • res.redirect()
    • res.send()
    • res.serverError()
    • res.set()
    • res.status()
    • res.type()
    • res.view()
  • Waterline (ORM)
    • Models
      • .count()
      • .create()
      • .destroy()
      • .find()
      • .findOne()
      • .findOrCreate()
      • .native()
      • .query()
      • .stream()
      • .update()
    • Populated Values
      • .add()
      • .remove()
    • Queries
      • .exec()
      • .limit()
      • .populate()
      • .skip()
      • .sort()
      • .where()
    • Records
      • .save()
      • .toJSON()
      • .toObject()
  • WebSockets
    • Resourceful PubSub
      • .message()
      • .publishAdd()
      • .publishCreate()
      • .publishDestroy()
      • .publishRemove()
      • .publishUpdate()
      • .subscribe()
      • .unsubscribe()
      • .unwatch()
      • .watch()
      • .subscribers()
    • sails.sockets
      • .addRoomMembersToRooms()
      • .blast()
      • .broadcast()
      • .getId()
      • .join()
      • .leave()
      • .leaveAll()
      • .removeRoomMembersFromRooms()
      • sails.sockets.emit()
      • sails.sockets.id()
      • sails.sockets.rooms()
      • sails.sockets.socketRooms()
      • sails.sockets.subscribers()
    • Socket Client
      • io.sails
      • io.socket
      • SailsSocket
        • Methods
        • Properties
      • io.socket.delete()
      • io.socket.get()
      • io.socket.off()
      • io.socket.on()
      • io.socket.post()
      • io.socket.put()
      • io.socket.request()

Built with Love

The Sails framework is maintained by a web & mobile studio in Austin, TX, with the help of our contributors. We created Sails in 2012 to assist us on Node.js projects. Naturally we open-sourced it. We hope it makes your life a little bit easier!

Sails:
  • What is Sails?
  • Treeline IDE
  • Contribute
  • Logos/artwork
About:
  • The Sails Company
  • Security
  • News
  • Legal
Help:
  • Get started
  • Documentation
  • Docs
  • Enterprise
  • Hire us

© 2012-2018 The Sails Company. 
The Sails framework is free and open-source under the MIT License.