Class: AssociationValidator

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

Instance Method Summary collapse

Instance Method Details

#validate_each(record, attribute, record_id) ⇒ Object 



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# File 'lib/association_validator.rb', line 2

def validate_each(record, attribute, record_id)
  return if record.send(attribute).blank? # return if there is nothing to validate
  # use :presence => true if you want to confirm that something is there
  
  if not options[:polymorphic_class].blank?
    attribute_string = record.send(options[:polymorphic_class])
    return if attribute_string.blank?
    
  elsif options[:class_name].blank? # if class_name is not specified, assume that it's the attirbute without the last 3 characters which should be _id
    attribute_string = attribute.to_s
    attribute_string[-3,3] = ''
    
  elsif options[:class_name].is_a?(String)
    attribute_string = options[:class_name]
    
  elsif options[:class_name].is_a?(Proc)
    attribute_string = options[:class_name].yield(record)
    return if attribute_string.blank?
    
  else
    raise "Association Validator does not support a(n) #{options[:class_name].class.to_s.humanize} as a class_name option"
  end
  
  c  = attribute_string.camelize.constantize # create a refrence to the class
  begin
    valid = c.find(value, :select => 'id') # activerecord will raise an exception if it's not found, so we're going to catch it
  rescue 
    record.errors[attribute] = (options[:message] || "is a non existent record") # and report that it doesn't exist
  end
end