Refactor a type implementation

sale.rb

  
  ###---------------------------------------------------- Class Methods  

  def sale_type
    @sale_type ||= Sale.sale_type_ids[ self.sale_type_id - 1 ][0]
  end

  ###---------------------------------------------------- Class Methods

  def self.sale_type_ids
    [
      ['Personal Property', 1],
      ['Consignment', 2]
    ]
  end

sale_refactored.rb

  ###---------------------------------------------------- Class Methods  

  def sale_type
    @sale_type ||= Sale.sale_type_ids.detect { |t| t[:id] == sale_type_id }.try(:name)
  end

  ###---------------------------------------------------- Class Methods

  def self.sale_type_ids
    {
      { id: 1, name: 'Personal Property' },
      { id: 2, name: 'Consignment' }
    }
  end