Rails Error Handling Models
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Rails Validation Error Message
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Rails Custom Error Messages
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a RoR app. What's a good strategy? Why does this matter? A Rails app can have awesome unit and functional tests, and then in production, something goes wrong and the right error handling activerecord errors full messages does not happen, making a bad situation worse. By this, I mean, it's bad rails exceptions enough that something went wrong in production. It's even worse if: You don't have clear log messages that identify exactly what
Rails Form Errors
went wrong. You didn't get automatically notified via email that something went wrong. Instead, the customer told the customer service rep that there's an issue. Ideally, when an error happens, the responsible developers should be notified. https://code.tutsplus.com/articles/writing-robust-web-applications-the-lost-art-of-exception-handling--net-36395 Here's some tips on logging setup and error handling, including a utility method to log the stack trace and send an email. The next article, Testing Error Handling, will show you how to verify that your error handling strategy is properly implemented, includind with rspec tests. Log Setup Notification of any Exceptions via Email with Gem exception_notification Check out the gem exception_notification. It works great. One things the docs don't point http://www.railsonmaui.com/blog/2013/05/08/strategies-for-rails-logging-and-error-handling out is that it works great with MailCatcher. This allows you to "test" that your exception notification emails are being sent as expected without using a real mail account. Thus, do enable exception logging in development mode, contrary to the basic setup. Here's a config example at this post on MailCatcher and mail_view. Log the Browser Details with Gem ‘browser_details' The gem browser_details will tell you what type of browser was used, which can be very important when errors occur. I cracked up when I read this from the gem info page: Have you ever had the conversation: Your site doesn't work. What browser are you using and do you have Javascript enabled? What's a browser? Control Rails Log Verbosity with Gem lograge Sometimes too much of a good thing (log info) is a bad thing, and that's true with Rails default logging. Check out the gem 'lograge'. The big difference is that a single request will take a single line. To quote the README, instead of logs like this: Started GET "/" for 127.0.0.1 at 2012-03-10 14:28:14 +0100 Processing by HomeController#index as HTML Rendered text template within layouts/application (0.0ms) Rendered layouts/_assets.html.erb (2.0ms) Rendered layouts/_top.html.erb (2.6ms) Rendered layouts/_about.html.erb (0.3ms) Rendered layouts/_google_analytics.html.erb (0.4ms) Completed 200 OK in 79ms (Views: 78.8ms | Ac
those solutions. Let me walk you through the possibilities. begin/rescue block begin/rescue blocks are the standard ruby mechanism to deal with exceptions. It might look like this: begin do_something https://blog.simplificator.com/2015/03/13/handling-errors-in-ruby-on-rails/ rescue handle_exception end This works nice for exceptions that might happen in your code. But what if you want to rescue every occurrence of a specific exception, say a NoPermissionError which might http://rubylearning.com/satishtalim/ruby_exceptions.html be raised from your security layer? Clearly you do not want to add a begin/rescue block in all your actions just to render an error message, right? Around filter An around filter could error message be used to catch all those exceptions of a given class. Honestly I haven't used a before filter for this, this idea came to my mind when writing this blog post. class ApplicationController < ActionController::Base around_action :handle_exceptions private def handle_exceptions begin yield rescue NoPermissionError redirect_to 'permission_error' end end end rescue_from rescue_from gives you the same possibilities as the around filter. It's rails validation error just shorter and easier to read and if the framework offers a convenient way, then why not use it. There are multiple ways to define a handler for an exception, for a short and sweet handler I prefer the block syntax: class ApplicationController < ActionController::Base rescue_from 'NoPermissionError' do |exception| redirect_to 'permission_error' end end exceptions_app There is an additional feature (added in Rails 3.2) that allows to handle exceptions. You can specify an exceptions_app which is used to handle errors. You can use your own Rails app for this: config.exceptions_app = self.routes If you do so, then your routing must be configured to match error codes like so: match '/404', to: 'exceptions#handle_404' ... Alternatively you can specify a lambda which receives the whole Rack env: config.exceptions_app = lambda do |env| # do something end Do you wonder how you can call an arbitrary action when you have the env? It's pretty easy: action = ExceptionsController.action(:render_error) action.call(env) In any case you want to set following configuration for exceptions_app to be used: Rails.application.config.consider_all_requests_local = false Rails.application.config.action_dispatch.show_exceptions = true But where is the exception you ask? It is stored in the Rack env: env['action_dispatch.exception'] And as