app/helpers/solder/application_helper.rb~ in solder-0.1.0 vs app/helpers/solder/application_helper.rb~ in solder-0.2.0

@@ -1,13 +1,36 @@
 module Solder
   module ApplicationHelper
+    def solder_onto(name, touch: [], attribute_safelist: ["class"], &block)
+      soldered_html = capture(&block).to_s.strip
+      fragment = Nokogiri::HTML.fragment(soldered_html)
+
+      first_fragment_child = fragment.first_element_child
+
+      # rehydrate
+      ui_state = Rails.cache.read "solder/#{solder_key(name)}"
+
+      ui_state&.select { attribute_safelist.include?(_1) }&.each do |attribute_name, value|
+        first_fragment_child[attribute_name] = sanitize value
+      end
+
+      # add stimulus controller and create unique key
+      first_fragment_child["data-controller"] = "#{first_fragment_child["data-controller"]} solder".strip
+      first_fragment_child["data-solder-key-value"] = solder_key(name)
+
+      first_fragment_child["data-solder-touch"] ||= Array(touch).map(&:to_sgid).map(&:to_s).join(":")
+
+      first_fragment_child.to_html.html_safe
+    end
+
     def solder_key(name)
       key = cache_fragment_name(name, skip_digest: true)
         .flatten
         .compact
         .map(&:cache_key)
         .join(":")
-      key += ":#{caller(1..1).first}"
+
+      key += ":#{caller.find { _1 =~ /html/ }}"
 
       ActiveSupport::Digest.hexdigest(key)
     end
   end
 end