Class: AWS::Record::UniquenessValidator

Inherits:
Validator
  • Object
show all
Defined in:
lib/simple_unique/validations/uniqueness.rb

Constant Summary collapse

ACCEPTED_OPTIONS = 
[:message, :scope, :allow_nil, :allow_blank, :if, :unless]

Instance Method Summary collapse

Instance Method Details

#message ⇒ Object 



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# File 'lib/simple_unique/validations/uniqueness.rb', line 30

def message
  options[:message] || 'has already been taken'
end

#validate_attribute(record, attribute_name, value) ⇒ Object 



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# File 'lib/simple_unique/validations/uniqueness.rb', line 9

def validate_attribute record, attribute_name, value

  # @TODO - Model the initial relation setup after the setup
  # found in ActiveRecord::Validations::UniquenessValidator.
  # Not sure it we have to go to such lengths or not...
  relation = record.class

  scope_array(options[:scope]).each do |scope_item|
    scope_value = record.send(scope_item.to_sym)
    relation = relation.where(scope_item.to_sym => scope_value)
  end

  existing_record = SimpleDB.consistent_reads do
    relation.where(attribute_name.to_sym => value).first
  end
  taken = !existing_record.nil?

  record.errors.add(attribute_name, message) if taken #blank

end