ErratumResponsum

Error response handlers for a Rails controller, that always return JSON.

Installation

Add this line to your application's Gemfile:

gem 'erratum_responsum'

And then execute:

$ bundle

Or install it yourself as:

$ gem install erratum_responsum

Usage

Add the concern to your ApplicationController or ApiController

require 'erratum_responsum'

class ApiController < ActionController::API
  include ErratumResponsum
end

Media Type

You can optionally set the class variable error_media_type to change the Content-Type of error responses.

  self.error_media_type = 'application/vnd.xpbytes.errors.v1+json'

Rescue Errors

In order to use the error responses, use rescue_from to handle them:

  rescue_from CanCan::AccessDenied, AuthorizedTransaction::TransactionUnauthorized, with: :forbidden
  rescue_from OptimisticallyStale::MissingLockVersion, ActionController::BadRequest,
              RequestMissingParam, with: :bad_request
  rescue_from ActiveRecord::RecordNotFound, with: :not_found
  rescue_from ActionController::UnknownFormat, NoAcceptSerializer, with: :not_acceptable
  rescue_from ResourceGone, with: :gone
  rescue_from ActiveRecord::StatementInvalid, ActiveRecord::RecordInvalid,
              ContentDoesNotMatchContentType, with: :unprocessable_entity
  rescue_from ActiveRecord::RecordNotUnique, ActiveRecord::StaleObjectError, with: :conflict
  rescue_from ContentTypeNotRecognised, with: :unsupported_media_type

Now, when one of these error is raised in a controller action, the error response is generated automatically.

💡 Remove CanCan if you don't use cancancan.

💡 Remove AuthorizedTransaction , if you don't use authorized_transaction.

💡 Remove OptimisticallyStale if you don't use optimistically_stale

When the exception has more information, such as an error_code, the code will use that instead, prefixed with Ex. If there is no such information, the error class name is used to generate the error code, prefixed with Gx. Change this behaviour by overriding def error_code(error).

This gem does expose more errors

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at XPBytes/erratum_responsum.