Module: Redis::Validations::Uniqueness

Defined in:
lib/redis/validations/uniqueness.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



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# File 'lib/redis/validations/uniqueness.rb', line 6

def self.included(base)
  base.class_eval do
    class_inheritable_array :unique_fields
    self.unique_fields ||= []
    
    class << self
      def validates_uniqueness_of(field)
        unique_fields << field
      end
    end
    
    validate do |record|
      record.unique_fields.each do |name|
        if key_in_use = connection.hget(record.uniqueness_key(name), record.send(name))
          if key_in_use != record.key
            record.errors.add(name, "must be unique")
          end
        end
      end
    end
    
    within_save_block do |record|
      record.unique_fields.each do |name|
        connection.hdel(record.uniqueness_key(name), record.previous_attributes[name])
        connection.hset(record.uniqueness_key(name), record.send(name), record.key)
      end
    end
    
    within_destroy_block do |record|
      record.unique_fields.each do |name|
        connection.hdel(record.uniqueness_key(name), record.send(name))
      end
    end
  end
end

Instance Method Details

#uniqueness_key(attribute_name) ⇒ Object 



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# File 'lib/redis/validations/uniqueness.rb', line 2

def uniqueness_key(attribute_name)
  File.join(model_name, attribute_name.to_s.pluralize)
end