module

ActiveResource::Validations

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 ActiveRecord::Errors.

Example

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)

Included modules

ActiveModel::Validations

Files

activeresource/lib/active_resource/validations.rb

1Note

ActiveResource validation is a little different

autonomous · Oct 1, 2009

Given the following model on the remote end:

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

And this ActiveResource on the client end:

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

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

person = Person.new( :first_name => 'Billy', :emails => "[email protected]" ) 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/" protected def validate errors.add("last name", "can't be empty") if last_name.blank? end end