Rails Raise Error In Model
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creation date..." if created_on > Time.now end end ##News controller class Publish::NewsController < Publish::BaseController def create begin @news = rails errors add custom message News.new(params[:news]) rescue flash[:notice] = "Invalid creation date" render :action => 'new'
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end if @news.save flash[:notice] = 'News was successfully created.' redirect_to :action => 'list' else render rails exceptions :action => 'new' end end end ... I'm well off here, I know. When date validation fails I see a RuntimeError in the controller and the
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string specified in the News.validate_date method. Can someone explain how to properly deal with raising exceptions in the model and rescuing in the controller? Much appreciated... Luke_Redpath 2006-06-26 08:04:16 UTC #2 You're taking the right approach to rescuing exceptions however you are taking the wrong approach to your validations by using rails standard error exceptions. Rails already has a built-in mechanism for dealing with whether or not a record is a valid so instead of raising an exception what you should be doing is adding your error to the errors array. This will make @yourobject.valid? and @yourobject.save return false. Theres also no need to set the validation method as a callback as Rails already has validation hooks you can tie into. So you should do something like this: class News < ActiveRecord::Base protected def validate self.errors.add(:created_on, "is invalid") if self.created_on > Time.now end end class Publish::NewsController < Publish::BaseController def create @news = News.new(params[:news]) if @news.save flash[:notice] = 'News was successfully created.' redirect_to :action => 'list' else flash[:error] = @news.errors render :action => 'new' end end end More information on Rails errors and validations: http://api.rubyonrails.org/classes/ActiveRecord/Errors.htmlhttp://api.rubyonrails.org/classes/ActiveRecord/Validations.html gregor002 2006-06-26 13:47:05 UTC #3 Cheers thanks for that, Luke. Mittineague 2014-09-19 01:36:01 UTC #4 Home Categories FAQ/Guidelines Terms of Service Privacy P
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in realizing this i18n http://doc.bccnsoft.com/docs/rails-guides-3.2-en/active_record_validations_callbacks.html interface and with this article I don't want to attack them in any way. You may want to read Sven Fuchs' writeup on the Rails i18n features first in order to rails raise better understand some parts of the article. The Stumbling Block A few days ago when I tried to implement the i18n functionality for Rails' Date and Time classes I stumbled across an interesting part in the i18n source or, rails raise error to be more specific, in the simple backend's localize method: def localize(locale, object, format = :default) raise ArgumentError, "Object must be a Date, DateTime or Time object. #{object.inspect} given." unless object.respond_to?(:strftime) type = object.respond_to?(:sec) ? 'time' : 'date' formats = translate(locale, :"#{type}.formats") format = formats[format.to_sym] if formats && formats[format Record Validations and Callbacks Active Record Associations Active Record Query Interface Views Layouts and Rendering in Rails Action View Form Helpers Controllers Action Controller Overview Rails Routing from the Outside In Digging Deeper Active Support Core Extensions Rails Internationalization API Securing Rails Applications Debugging Rails Applications Performance Testing Rails Applications Configuring Rails Applications Rails Command Line Tools and Rake Tasks Asset Pipeline Extending Rails Rails on Rack Creating and Customizing Rails Generators Contributing to Ruby on Rails Contributing to Ruby on Rails API Documentation Guidelines Ruby on Rails Guides Guidelines Release Notes Ruby on Rails 3.2 Release Notes Ruby on Rails 3.1 Release Notes Ruby on Rails 3.0 Release Notes Ruby on Rails 2.3 Release Notes Ruby on Rails 2.2 Release Notes Contribute Credits Active Record Validations and Callbacks This guide teaches you how to hook into the life cycle of your Active Record objects. You will learn how to validate the state of objects before they go into the database, and how to perform custom operations at certain points in the object life cycle. After reading this guide and trying out the presented concepts, we hope that you'll be able to: Understand the life cycle of Active Record objects Use the built-in Active Record validation helpers Create your own custom validation methods Work with the error messages generated by the validation process Create callback methods that respond to events in the object life cycle Create special classes that encapsulate common behavior for your callbacks Create Observers that respond to life cycle events outside of the original class Chapters The Object Life CycleValidations OverviewWhy Use Validations? When Does Validation Happen? Skipping Validations valid? and invalid? errors[]Validation Helpersacceptance validates_associated confirmation exclusion format inclusion length numericality presence uniqueness validates_with validates_eachCommon Validation Options:allow_nil :allow_blank :message :onConditional ValidationUsing a Symbol with :if and :unless Using a String with :if and :unless Using a Proc with :if and :unless Grouping conditional validationsPerforming Custom ValidationsCustom Validators Custom MethodsWorking with Validation Errorserrors errors[] errors.add errors[:base] errors.clear errors.sizeDisplaying Validation Errors in the Vie