Options used for dealing with missing records

optional_records.rb

## Model code

class Customer < ActiveRecord::Base

  def find_by_name(name)
    Option[where(name: name).first]
  end
end

## Controller code

class CustomersController < ApplicationController
  def show
    Customer.find_by_name(params[:name]).match do |m|
      m.some { |customer| @customer = customer }
      m.none { render text: "Error - customer not found" }
    end
  end
end