3 files changed, 9 insertions, 26 deletions
diff --git a/actionpack/lib/action_view/renderable.rb b/actionpack/lib/action_view/renderable.rb
index 2e2fff44c6..3a30e603fe 100644
--- a/actionpack/lib/action_view/renderable.rb
+++ b/actionpack/lib/action_view/renderable.rb
@@ -12,7 +12,7 @@ module ActionView
     end
 
     def method
-      ['_run', @extension, @method_segment].compact.join('_').to_sym
+      ['_run', @extension, @method_segment, local_assigns_keys].compact.join('_').to_sym
     end
 
     private
@@ -28,5 +28,11 @@ module ActionView
           @prepared = true
         end
       end
+
+      def local_assigns_keys
+        if @locals && @locals.any?
+          "locals_#{@locals.keys.map { |k| k.to_s }.sort.join('_')}"
+        end
+      end
   end
 end
diff --git a/actionpack/lib/action_view/template.rb b/actionpack/lib/action_view/template.rb
index 069d7d57af..5e5ea9b9b9 100644
--- a/actionpack/lib/action_view/template.rb
+++ b/actionpack/lib/action_view/template.rb
@@ -20,7 +20,7 @@ module ActionView #:nodoc:
       set_extension_and_file_name
 
       @method_segment = compiled_method_name_file_path_segment
-      @locals = locals || {}
+      @locals = (locals && locals.dup) || {}
       @handler = self.class.handler_class_for_extension(@extension).new(@view)
     end
 
diff --git a/actionpack/lib/action_view/template_handlers/compilable.rb b/actionpack/lib/action_view/template_handlers/compilable.rb
index d079ef3d15..256d8da031 100644
--- a/actionpack/lib/action_view/template_handlers/compilable.rb
+++ b/actionpack/lib/action_view/template_handlers/compilable.rb
@@ -5,9 +5,6 @@ module ActionView
         base.extend ClassMethod
 
         @@mutex = Mutex.new
-
-        # Map method names to the compiled local assigns
-        @@template_args = {}
       end
 
       module ClassMethod
@@ -26,11 +23,7 @@ module ActionView
         return false unless recompile_template?(template)
 
         @@mutex.synchronize do
-          locals_code = ""
-          locals_keys = cache_template_args(template.method, template.locals)
-          locals_keys.each do |key|
-            locals_code << "#{key} = local_assigns[:#{key}];"
-          end
+          locals_code = template.locals.keys.map { |key| "#{key} = local_assigns[:#{key}];" }.join
 
           source = <<-end_src
             def #{template.method}(local_assigns)
@@ -69,25 +62,9 @@ module ActionView
           # Always recompile inline templates
           return true if template.is_a?(InlineTemplate)
 
-          # Unless local assigns support, recompile
-          return true unless supports_local_assigns?(template.method, template.locals)
-
           # Otherwise, use compiled method
           return false
         end
-
-        def cache_template_args(render_symbol, local_assigns)
-          @@template_args[render_symbol] ||= {}
-          locals_keys = @@template_args[render_symbol].keys | local_assigns.keys
-          @@template_args[render_symbol] = locals_keys.inject({}) { |h, k| h[k] = true; h }
-          locals_keys
-        end
-
-        # Return true if the given template was compiled for a superset of the keys in local_assigns
-        def supports_local_assigns?(render_symbol, local_assigns)
-          local_assigns.empty? ||
-            ((args = @@template_args[render_symbol]) && local_assigns.all? { |k,_| args.has_key?(k) })
-        end
     end
   end
 end