Module: ActiveResource::Validations

Defined in:
lib/active_resource/validations.rb

Overview

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.on(:last_name)  # => "can't be empty"
person.last_name = "Halpert"  
person.save                   # => true (and person is now saved to the remote service)

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.included(base) ⇒ Object

:nodoc:



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# File 'lib/active_resource/validations.rb', line 251

def self.included(base) # :nodoc:
  base.class_eval do
    alias_method_chain :save, :validation
  end
end

Instance Method Details

#errors ⇒ Object

Returns the Errors object that holds all information about attribute error messages.



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# File 'lib/active_resource/validations.rb', line 286

def errors
  @errors ||= Errors.new(self)
end

#save_with_validation ⇒ Object

Validate a resource and save (POST) it to the remote web service.



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# File 'lib/active_resource/validations.rb', line 258

def save_with_validation
  save_without_validation
  true
rescue ResourceInvalid => error
  case error.response['Content-Type']
  when /xml/
    errors.from_xml(error.response.body)
  when /json/
    errors.from_json(error.response.body)
  end
  false
end

#valid? ⇒ Boolean

Checks for errors on an object (i.e., is resource.errors empty?).

Examples

my_person = Person.create(params[:person])
my_person.valid?
# => true

my_person.errors.add('login', 'can not be empty') if my_person. == ''
my_person.valid?
# => false

Returns:

  • (Boolean) 


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# File 'lib/active_resource/validations.rb', line 281

def valid?
  errors.empty?
end