Fix dependency tracker bug

actionview/CHANGELOG.md

@@ -1,3 +1,8 @@
+*   Fixed a dependency tracker bug that caused template dependencies not
+    count layouts as dependencies for partials.
+
+    *Juho Leinonen*
+
 *   Extracted `ActionView::Helpers::RecordTagHelper` to external gem
     (`record_tag_helper`) and added removal notices.
 

actionview/lib/action_view/dependency_tracker.rb

@@ -76,6 +76,12 @@ module ActionView
         (?:#{STRING}|#{VARIABLE_OR_METHOD_CHAIN})      # finally, the dependency name of interest
       /xm
 
+      LAYOUT_DEPENDENCY = /\A
+        (?:\s*\(?\s*)                                  # optional opening paren surrounded by spaces
+        (?:.*?#{LAYOUT_HASH_KEY})                      # check if the line has layout key declaration
+        (?:#{STRING}|#{VARIABLE_OR_METHOD_CHAIN})      # finally, the dependency name of interest
+      /xm
+
       def self.call(name, template)
         new(name, template).dependencies
       end
@@ -106,15 +112,20 @@ module ActionView
           render_calls = source.split(/\brender\b/).drop(1)
 
           render_calls.each do |arguments|
-            arguments.scan(RENDER_ARGUMENTS) do
-              add_dynamic_dependency(render_dependencies, Regexp.last_match[:dynamic])
-              add_static_dependency(render_dependencies, Regexp.last_match[:static])
-            end
+            add_dependencies(render_dependencies, arguments, LAYOUT_DEPENDENCY)
+            add_dependencies(render_dependencies, arguments, RENDER_ARGUMENTS)
           end
 
           render_dependencies.uniq
         end
 
+        def add_dependencies(render_dependencies, arguments, pattern)
+          arguments.scan(pattern) do
+            add_dynamic_dependency(render_dependencies, Regexp.last_match[:dynamic])
+            add_static_dependency(render_dependencies, Regexp.last_match[:static])
+          end
+        end
+
         def add_dynamic_dependency(dependencies, dependency)
           if dependency
             dependencies << "#{dependency.pluralize}/#{dependency.singularize}"

actionview/test/template/dependency_tracker_test.rb

@@ -60,7 +60,6 @@ class ERBTrackerTest < Minitest::Test
   end
 
   def test_dependency_of_template_partial_with_layout
-    skip # FIXME: Needs to be fixed properly, right now we can only match one dependency per line. Need multiple!
     template = FakeTemplate.new("<%# render partial: 'messages/show', layout: 'messages/layout' %>", :erb)
     tracker = make_tracker("multiple/_dependencies", template)