```ruby
# frozen_string_literal: true

class VouchersController < ApplicationController
  def new
    @voucher = Voucher.find_voucher(params[:code]) if params[:code]
    @voucher ||= Voucher.new
    flash[:alert] = 'This code has already been used' if @voucher.claimed?
  end

  def create
    respond_to do |format|
      format.html do
        code = params.require(:voucher).require(:code)
        @voucher = Voucher.unclaimed.find_voucher(code)
        if @voucher
          @voucher.claim!(current_user)
          flash[:notice] = "Code activated: #{@voucher.product.name}"
          redirect_to root_path
        else
          flash[:alert] = 'Invalid code or already used'
          @voucher = Voucher.new
          render :new, status: :unprocessable_entity
        end
      end
    end
  end
end
```

Allow players from banned countries to claim vouchers
user
```ruby
# frozen_string_literal: true

class VouchersController < ApplicationController
  skip_before_action :redirect_if_country_banned

  def new
    @voucher = Voucher.find_voucher(params[:code]) if params[:code]
    @voucher ||= Voucher.new
    flash[:alert] = 'This code has already been used' if @voucher.claimed?
  end

  def create
    respond_to do |format|
      format.html do
        code = params.require(:voucher).require(:code)
        @voucher = Voucher.unclaimed.find_voucher(code)
        if @voucher
          @voucher.claim!(current_user)
          flash[:notice] = "Code activated: #{@voucher.product.name}"
          redirect_to root_path
        else
          flash[:alert] = 'Invalid code or already used'
          @voucher = Voucher.new
          render :new, status: :unprocessable_entity
        end
      end
    end
  end
end
```
assistant