Ruby on Rails latest stable (v6.1.7.7) - 1 note

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This module is deprecated or moved on the latest stable version. The last existing version (v3.2.13) is shown here.

Module to support validation and errors with Active Resource objects. The module overrides Base#save to rescue ActiveResource::ResourceInvalid exceptions and parse the errors returned in the web service response. The module also adds an errors collection that mimics the interface of the errors provided by ActiveModel::Errors.


Consider a Person resource on the server requiring both a first_name and a last_name with a validates_presence_of :first_name, :last_name declaration in the model:

person = Person.new(:first_name => "Jim", :last_name => "")
person.save                   # => false (server returns an HTTP 422 status code and errors)
person.valid?                 # => false
person.errors.empty?          # => false
person.errors.count           # => 1
person.errors.full_messages   # => ["Last name can't be empty"]
person.errors[:last_name]  # => ["can't be empty"]
person.last_name = "Halpert"
person.save                   # => true (and person is now saved to the remote service)
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October 1, 2009
0 thanks

ActiveResource validation is a little different

Given the following model on the remote end:

class Person < ActiveRecord::Base
 validates_presence_of :first_name, :last_name, :email

And this ActiveResource on the client end:

class Person < ActiveResource::Base
 self.site = "http://api.people.com:3000/" 

Validation messages will only be returned after an attempted save call on the client end - eg:

person = Person.new( :first_name => 'Billy', :emails => "william@anotherplanet.co.za" )
person.valid?                 # => true
person.errors.full_messages   # => []
person.save                   # => false
person.valid?                 # => false
person.errors.full_messages   # => ["Last name can't be empty"]

In ActiveResource::Base it is suggested that you can perform client site validation with something like this:

class Person < ActiveResource::Base
 self.site = "http://api.people.com:3000/"
  def validate
   errors.add("last name", "can't be empty") if last_name.blank?