Follow AR like naming of factory method

lib/active_storage/controllers/variants_controller.rb

@@ -4,7 +4,7 @@
 class ActiveStorage::Controllers::VariantsController < ActionController::Base
   def show
     if blob_key = decode_verified_key
-      variant = ActiveStorage::Variant.lookup(blob_key: blob_key, variation_key: params[:variation_key])
+      variant = ActiveStorage::Variant.find_or_create_by(blob_key: blob_key, variation_key: params[:variation_key])
       redirect_to variant.url
     else
       head :not_found

lib/active_storage/variant.rb

@@ -7,7 +7,7 @@ class ActiveStorage::Variant
   attr_reader :blob, :variation
   delegate :service, to: :blob
 
-  def self.lookup(blob_key:, variation_key:)
+  def self.find_or_create_by(blob_key:, variation_key:)
     new ActiveStorage::Blob.find_by!(key: blob_key), variation: verifier.verify(variation_key)
   end