Raise Error Rails 3
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Rails Raise Exception In Model
million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up How to raise a custom Exception in Rails 3+ with normal control flow? up vote 1 down vote favorite Given
Rails Exception Types
the following controller method: def create @client = User.find(params[:client][:id]) respond_to do |format| if @client.present? && @client.add_manager(current_user) format.html { redirect_to clients_path, notice: "Successfully added manager" } else format.html { redirect_to clients_path, error: "Could not find client" } end end end How do I get this to fail properly in the else block instead of throwing a RuntimeError which turns into a "Something went wrong" on production? def add_manager(user) raise "Already a manager" if self.manager_users.include?(user) rails standard error self.manager_users << user if user.trainer? end Is the code... ruby-on-rails share|improve this question asked May 21 '13 at 1:24 Daniel Fischer 1,52511841 add a comment| 1 Answer 1 active oldest votes up vote 0 down vote You can try something like this: In your controller class YourAppName::AlreadyManagerError < StandardError end Now change "Already a manager" to the name of your custom error def add_manager(user) raise YourAppName::AlreadyManagerError if self.manager_users.include?(user) self.manager_users << user if user.trainer? end Then in your ApplicationController rescue_from YourAppName::AlreadyManagerError do |exception| render :nothing => "Already a manager", :status => 404 end This article goes into more detail. Also check out rescue_from share|improve this answer answered May 21 '13 at 3:16 fontno 3,73822337 How do rails control flows like a respond to block with if and then #save on that record cause it to hit the true if block and then false for the redirect? I just want to follow the same pattern with my own method. –Daniel Fischer May 21 '13 at 19:13 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up using Facebook Sign up using Email and Password Post as a guest Name Email Post as a guest Name Email discard By posting your answer, you agree to the privacy
and rescuing custom errors in a Rails application. It's often useful to map custom
Rails Exceptions
Ruby errors to HTTP response status codes and have Rails render rails raise internal server error the appropriate HTML error pages. For example, you might have a controller that is acting as raise error ruby a simple proxy to a third party service such as Twitter or Facebook, and you need any of the HTTP errors encountered when calling those sites to http://stackoverflow.com/questions/16660705/how-to-raise-a-custom-exception-in-rails-3-with-normal-control-flow be handled natively by your app. Another use case would be in a Service-oriented architecture (SOA), where you want any errors in your back end services propagated to your front end web application. In this post we'll demonstrate rescuing status errors in an imaginary proxy controller using the awesome Faraday gem. For the sake of https://wearestac.com/blog/raising-and-rescuing-custom-errors-in-rails brevity we've omitted the inclusion of tests though in the wild we'd build such a feature using TDD and our favourite test weapon, RSpec. Not Found To start, let's handle basic 404 Not Found errors that occur when calling a service. For this we'll need a custom error class that extends StandardError. # lib/errors/not_found.rb module Errors class NotFound < StandardError; end end Faraday provides a neat Rack-esque middleware feature. By creating our own custom middleware we can catch any Faraday 404s and raise our custom error. Furthermore, we can re-use the middleware anytime we need the same behaviour. # lib/errors/raise_error.rb module Errors class RaiseError < Faraday::Response::Middleware def on_complete(env) raise Errors::NotFound if env[:status] == 404 end end end Now for the proxy controller. # app/controllers/proxy_controller.rb class ProxyController < ApplicationController def index connection = Faraday.new(:url => 'http://someservice') do |f| f.adapter Faraday.default_adapter f.use Errors::RaiseError # Include custom middleware end response = connection.get('/some/resource') render :text => response.body end end At this point any NotFounds
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