Rails Catch Argument Error

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Ruby Argumenterror

Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, ruby rescue syntax just like you, helping each other. Join them; it only takes a minute: Sign up Rescuing an invalid date in a rails controller up vote 1 down vote favorite I have this in a controller: pickuptime = rails exceptions params[:appointment][:pickuptime] pickuptime = DateTime.strptime(pickuptime, "%m/%d/%Y %l:%M %p %Z") I would like to rescue it if DateTime.strptime kicks back an Invalid Date error and redirect it back to the previous page with the flash message 'Invalid date'. How can I accomplish this? I am using Ruby 2.1.2 and Rails 4.1.4. Thanks! ruby-on-rails ruby exception-handling rescue share|improve this question asked Jan 29 '15 at 2:17 jackerman09 65911135 add a comment| 1 Answer 1 active oldest votes

Rescue Argumenterror Ruby

up vote 2 down vote accepted you can do this in your controller: begin pickuptime = params[:appointment][:pickuptime] pickuptime = DateTime.strptime(pickuptime, "%m/%d/%Y %l:%M %p %Z") rescue ArgumentError => e flash[:error] = e.message redirect_to :back end The Invalid Date Error should be a ArgumentError exception with the message you want. share|improve this answer answered Jan 29 '15 at 2:32 Edward 1,290516 Thanks, the only thing I had to change was to add a return after the redirect_to :back. –jackerman09 Jan 29 '15 at 2:52 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 policy and terms of service. Not the answer you're looking for? Browse other questions tagged ruby-on-rails ruby exception-handling rescue or ask your own question. asked 1 year ago viewed 707 times active 1 year ago Blog Stack Overflow Podcast #92 - The Guerilla Guide to Interviewing Related 343Begin, Rescue and Ensure in Ruby?9work with rescue in Rails606Why is it bad style to `rescue Exception => e` in Ruby?0Do I have to rescue exceptions inside my loop using Ruby?2How to continue with the next rescue block

number with 0, ruby will throw exception and so breaking your ruby standard error code and bringing down your application. As a developer, you ruby custom exceptions should visualize the possibility of such exception and handle them gracefully within begin/end block.You can

Ruby Raise Method

read more about ruby exception class here at ruby-doc.org.The different exception thrown by ruby is as below in hierarchical order. NOTE : creating and raising custom http://stackoverflow.com/questions/28205963/rescuing-an-invalid-date-in-a-rails-controller exception is explained in this post RUBY EXCEPTION HIERARCHY NoMemoryError ScriptError LoadError NotImplementedError SyntaxError SignalException Interrupt StandardError ArgumentError IOError EOFError IndexError LocalJumpError NameError NoMethodError RangeError FloatDomainError RegexpError RuntimeError SecurityError SystemCallError SystemStackError ThreadError TypeError ZeroDivisionError SystemExit fatal wherever you see possibility of occurrence of any of these exception in your code, you should https://codedecoder.wordpress.com/2013/01/06/exception-handling-in-ruby-rails/ wrap that part of code in begin end block and try to rescue it gracefully. Descendants of class Exception are used to communicate between raise methods and rescue statements in begin/end blocks. Exception objects carry information about the exception—its type (the exception’s class name), an optional descriptive string, and optional traceback information. We can handle an exception in following ways. NOTE : ruby use raise method internally to trigger any of the above exception. You may use raise anywhere in your code to trigger your own exception explicitly. Exception handling examples : I' am just specifying the syntax of begin rescue ensure and end blocks. Example 1: Here, you are aware, what type of above error your code may throw. this format is useful only if you know beforehand what exception your code may throw begin ***** your code which you think may raise Say ArgumentError **** rescue ArgumentError ****** write your ha

1_8_7_330 (0) 1_9_1_378 http://apidock.com/ruby/argumenterror (-38) 1_9_2_180 (32) 1_9_3_125 (0) 1_9_3_392 (0) What's this? Related Namespace parent StandardError Raised when the arguments are wrong http://api.rubyonrails.org/v5.0/classes/ActiveSupport/Rescuable/ClassMethods.html and there isn’t a more specific Exception class. Ex: passing the wrong number of arguments [1, 2, 3].first(4, 5) ruby raise raises the exception: ArgumentError: wrong number of arguments (2 for 1) Ex: passing an argument that is not acceptable: [1, 2, 3].first(-4) raises the exception: ArgumentError: negative array size Show files where this class is defined (1 file) error.c rails catch argument Register or log in to add new notes. Soleone - February 12, 2009 2 thanks Use this! You should raise your own ArgumentError in methods to notify users of your class, if you think certain kinds of arguments aren’t acceptable. def transfer_money(amount) unless amount.is_a?(Number) raise ArgumentError.new("Only numbers are allowed") end # ... Do the actual work end Welcome Register Projects Help About Blog APIdock release: IRON STEVE (1.4) If you have any comments, ideas or feedback, feel free to contact us at APIdock copyright Nodeta Oy 2008-2016 Flowdock - Team Inbox With Chat for Software Developers Check out how the team behind APIdock connects Pivotal Tracker, GitHub and group chat to one workflow.

raised in controller actions. rescue_from receives a series of exception classes or class names, and a trailing :with option with the name of a method or a Proc object to be called to handle them. Alternatively a block can be given. Handlers that take one argument will be called with the exception, so that the exception can be inspected when dealing with it. Handlers are inherited. They are searched from right to left, from bottom to top, and up the hierarchy. The handler of the first class for which exception.is_a?(klass) holds true is the one invoked, if any. class ApplicationController < ActionController::Base rescue_from User::NotAuthorized, with: :deny_access # self defined exception rescue_from ActiveRecord::RecordInvalid, with: :show_errors rescue_from 'MyAppError::Base' do |exception| render xml: exception, status: 500 end protected def deny_access ... end def show_errors(exception) exception.record.new_record? ? ... end end Exceptions raised inside exception handlers are not propagated up. Source: show | on GitHub # File activesupport/lib/active_support/rescuable.rb, line 50 def rescue_from(*klasses, with: nil, &block) unless with if block_given? with = block else raise ArgumentError, 'Need a handler. Pass the with: keyword argument or provide a block.' end end klasses.each do |klass| key = if klass.is_a?(Module) && klass.respond_to?(:===) klass.name elsif klass.is_a?(String) klass else raise ArgumentError, "#{klass.inspect} must be an Exception class or a String referencing an Exception class" end # Put the new handler at the end because the list is read in reverse. self.rescue_handlers += [[key, with]] end end rescue_with_handler(exception, object: self) Link Matches an exception to a handler based on the exception class. If no handler matches the exception, check for a handler matching the (optional) exception.cause. If no handler matches the exception or its cause, this returns nil so you can deal with unhandled exceptions. Be sure to re-raise unhandled exceptions if this is what you expect. begin … rescue => exception rescue_with_handler(exception) || raise end Returns the exception if it was handled and nil if it was not. Source: show | on GitHub # File activesupport/lib/active_support/rescuable.rb, line 87 def rescue_with_handler(exception, object: self) if handler = handler_for_rescue(exception, object: object) handler.call exception exception end end