add_tags_to_customer_based_on_line_sku.rb

sku_tag_mapping = {
  'HLO-TCCC-ST':'Twin',
  'HLO-QCCC-ST':'Full/Queen',
  'HLO-KCCC-ST':'King',
  'HLO-TCPC-ST':'Twin',
  'HLO-QCPC-ST':'Full/Queen' #etc etc...
}

order = ShopifyAPI::Order.last
puts "\nProcessing Order:"
url_to_order = "https://resthouse.myshopify.com/admin/orders/#{order.id}"
url_to_customer = "https://resthouse.myshopify.com/admin/customers/#{order.customer.id}"

puts "<a href=\"#{url_to_order}\" target=\"_blank\">#{url_to_order}</a><br>"

customer = ShopifyAPI::Customer.find order.customer.id

order.line_items.each do |line|
    puts line.title

    if sku_tag_mapping.key?(line.sku)
       customer.tags = "#{customer.tags}, #{sku_tag_mapping[line.sku]}"
    end
    
end

puts "\nSaved Tags to:"
puts "<a href=\"#{url_to_customer}\" target=\"_blank\">#{url_to_customer}</a><br>"

customer.save