Error Message For Validation Rails
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Rails Custom Validation Error Message
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Conditional Validation Rails
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 skip validation rails 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 Viewerror_messages and error_me
helpers. A minimal implementation could be: class Person # Required dependency for ActiveModel::Errors extend ActiveModel::Naming def initialize @errors = ActiveModel::Errors.new(self) end attr_accessor :name attr_reader :errors def validate! errors.add(:name, :blank, message: "cannot be
Before_validation Rails
nil") if name.nil? end # The following methods are needed to be minimally validates uniqueness implemented def read_attribute_for_validation(attr) send(attr) end def self.human_attribute_name(attr, options = {}) attr end def self.lookup_ancestors [self] end end The last validates length of three methods are required in your object for Errors to be able to generate error messages correctly and also handle multiple languages. Of course, if you extend your object with ActiveModel::Translation http://guides.rubyonrails.org/v3.2.13/active_record_validations_callbacks.html you will not need to implement the last two. Likewise, using ActiveModel::Validations will handle the validation related methods for you. The above allows you to do: person = Person.new person.validate! # => ["cannot be nil"] person.errors.full_messages # => ["name cannot be nil"] # etc.. Methods # [], []= A add, add_on_blank, add_on_empty, added?, as_json B blank? C clear, count D delete E each, http://api.rubyonrails.org/classes/ActiveModel/Errors.html empty? F full_message, full_messages, full_messages_for G generate_message, get H has_key? I include? K key?, keys M marshal_dump, marshal_load N new S set, size T to_a, to_hash, to_xml V values Included Modules Enumerable Constants CALLBACKS_OPTIONS = [:if, :unless, :on, :allow_nil, :allow_blank, :strict] MESSAGE_OPTIONS = [:message] Attributes [R] details [R] messages Class Public methods new(base) Link Pass in the instance of the object that is using the errors object. class Person def initialize @errors = ActiveModel::Errors.new(self) end end Source: show | on GitHub # File activemodel/lib/active_model/errors.rb, line 72 def initialize(base) @base = base @messages = apply_default_array({}) @details = apply_default_array({}) end Instance Public methods [](attribute) Link When passed a symbol or a name of a method, returns an array of errors for the method. person.errors[:name] # => ["cannot be nil"] person.errors['name'] # => ["cannot be nil"] Note that, if you try to get errors of an attribute which has no errors associated with it, this method will instantiate an empty error list for it and keys will return an array of error keys which includes this attribute. person.errors.keys # => [] person.errors[:name] # => [] person.errors.keys # => [
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings http://stackoverflow.com/questions/10488302/rails-3-how-to-generate-custom-error-message-from-failed-validation and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation http://lindsaar.net/2008/4/22/tip-14-custom-error-messages-in-validations Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it error message only takes a minute: Sign up Rails 3: how to generate custom error message from failed validation up vote 7 down vote favorite 3 I'm using validates :feed_id, presence: true, uniqueness: true How should I be generating a custom error message to specify that the user has already subscribed to this feed (the feed_id) field is a duplicate I know validation error message I can just do validate_uniqueness_of but it would clutter up the code unnecessarily. How do I pass a specific error message if uniqueness validation fails?? ruby-on-rails ruby ruby-on-rails-3 validation share|improve this question asked May 7 '12 at 19:59 Ken W 4021718 add a comment| 1 Answer 1 active oldest votes up vote 16 down vote accepted Put a hash with the key message and desired message as the value instead of true: validates :feed_id, presence: true, uniqueness: {message: "already subscribed"} share|improve this answer answered May 7 '12 at 20:07 jdoe 12.8k12640 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 ruby-on-rails-3 validation or ask your own question. asked 4 years ago viewed 6614 times active 4 years ago Rel
you have a model with a field called ‘country_iso' which specifies the ISO value of the country the person belongs to. Database design concerns aside (you should really have it as country_id and a separate country_iso field) you might be stuck with this situation from a legacy database (like I was). As this is a required field, you set the following in your model: 1 2 3 class User < ActiveRecord::Base validates_presence_of :country_iso end So, you go ahead and make a form which presents the country as just a select box, because you don't want your users to worry about if Thailand is TH or TL, but then you don't specify a country and the error message comes back to the user in nice big letters: Country Iso can't be blank Ugh! Aside from the fact that Iso is capitalized badly, how many of YOUR users know that it stands for "International Standards Organization" and that a Country ISO is usually a two letter representation of the country? I'd wager about 3 of them have some idea :) So you go in and change the validates line to: 1 2 3 class User < ActiveRecord::Base validates_presence_of :country_iso, :message => "Country can't be blank" end Do your test again, and now you get: Country Iso Country can't be blank Nup.. that'd didn't really fix it. Fortunately, the fix is easy: 1 2 3 4 5 class User < ActiveRecord::Base validate do |user| user.errors.add_to_base("Country can't be blank") if user.country_iso.blank? end end Now, reload your view and you'll get: Country can't be blank Much better! blogLater Mikel Tweeting... Feeding... Who is this guy? Ruby on Rails Tips DECCA Driving Day Latest posts Rails Security Alert Encrypting Another Partition Using FileVault 2 on OSX Lion Installing Home Folder on Second Drive on OSX Lion undefined local variable or method `version_requirements' A New World of Resources Rails Static Page