Fix Rails 8.1 inline locals and frozen template rendering

Author: julianrubisch

app/helpers/cubism_helper.rb

@@ -9,6 +9,13 @@ def cubicle_for(resource, user, scope: "", html_options: {}, appear_trigger: :co
       location: block_location,
       view_context: self
     )
+    if block_source.variable_name.blank?
+      block_variable_name = block.parameters.find { |type, _| [:req, :opt, :rest].include?(type) }&.last
+      if block_variable_name.present?
+        block_source.variable_name = block_variable_name.to_s
+        Cubism.source_store[block_source.digest] = block_source
+      end
+    end
 
     resource_gid = resource.to_gid.to_s
 

lib/cubism/broadcaster.rb

@@ -21,7 +21,9 @@ def broadcast
 
         block_source = block_container.block_source
 
-        html = ApplicationController.render(inline: block_source.source, locals: {"#{block_source.variable_name}": present_users})
+        inline_source = block_source.source
+        inline_source = inline_source.dup if inline_source.frozen?
+        html = ApplicationController.render(inline: inline_source, locals: {"#{block_source.variable_name}": present_users})
 
         selector = "cubicle-element#cubicle-#{element_id}[identifier='#{signed_stream_identifier(resource.to_global_id.to_s)}']"