Class: Perfectline::ValidatesExistence::Rails3::ExistenceValidator

Inherits:
ActiveModel::EachValidator
  • Object
show all
Defined in:
lib/rails3.rb

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ ExistenceValidator

Returns a new instance of ExistenceValidator.



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# File 'lib/rails3.rb', line 12

def initialize(options)
  # set the default message if its unspecified
  options[:message] ||= :existence
  options[:both]    = true unless options.key?(:both)
  super(options)
end

Instance Method Details

#validate_each(record, attribute, value) ⇒ Object 



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# File 'lib/rails3.rb', line 19

def validate_each(record, attribute, value)
  normalized = attribute.to_s.sub(/_id$/, "").to_sym
  association = record.class.reflect_on_association(normalized)

  if association.nil? || !association.belongs_to?
    raise ArgumentError, "Cannot validate existence on #{normalized}, not a :belongs_to association"
  end

  target_class = nil

  # dealing with polymorphic belongs_to
  if association.options[:polymorphic]
    foreign_type = record.send(association.options[:foreign_type] || association.foreign_type)
    target_class = foreign_type.constantize unless foreign_type.nil?
  else
    target_class = association.klass
  end

  if value.nil? || target_class.nil? || !target_class.exists?(value)
    errors = [attribute]

    # add the error on both :relation and :relation_id
    if options[:both]
      if Rails::VERSION::MINOR >= 1
        foreign_key = association.foreign_key
      else
        foreign_key = association.primary_key_name
      end

      errors << (attribute.to_s.ends_with?("_id") ? normalized : foreign_key)
    end

    messages = [:"#{record.class.i18n_scope}.errors.messages.existence", "does not exist"]

    errors.each do |error|
      record.errors.add(error, options[:message], :message => messages)
    end
  end
end