gistfile1.rb

prod = ShopifyAPI::Product.find(6)
before = prod.variants.collect{|v| "#{v.position} - #{v.option1}"}

prod.variants[0].position = 3
prod.variants[2].position = 1
prod.variants.collect(&:save)

prod = ShopifyAPI::Product.find(6)
after = prod.variants.collect{|v| "#{v.position} - #{v.option1}"}

puts "Before: #{before}"
puts "After: #{after}"

# Expected output
# ["1 - oranges", "2 - apples", "3 - bananas"]
# ["1 - bananas", "2 - apples", "3 - oranges"]

# EDIT: Perform the replacement in a single API call
prod = ShopifyAPI::Product.find(6)
before = prod.variants.collect{|v| "#{v.position} - #{v.option1}"}

prod.variants = prod.variants.reverse
prod.save

prod = ShopifyAPI::Product.find(6)
after = prod.variants.collect{|v| "#{v.position} - #{v.option1}"}

puts "Before: #{before}"
puts "After: #{after}"