Check whether blocks are called from erb using a special __in_erb_template variable visible in block binding.

1 files changed, 7 insertions, 1 deletions

diff --git a/actionpack/lib/action_view/template_handlers/compilable.rb b/actionpack/lib/action_view/template_handlers/compilable.rb
index 1aef81ba1a..783456ab53 100644
--- a/actionpack/lib/action_view/template_handlers/compilable.rb
+++ b/actionpack/lib/action_view/template_handlers/compilable.rb
@@ -106,7 +106,13 @@ module ActionView
           locals_code << "#{key} = local_assigns[:#{key}]\n"
         end
 
-        "def #{render_symbol}(local_assigns)\nold_output_buffer = output_buffer;#{locals_code}#{body}\nensure\nself.output_buffer = old_output_buffer\nend"
+        <<-end_src
+          def #{render_symbol}(local_assigns)
+            old_output_buffer = output_buffer;#{locals_code}#{body}
+          ensure
+            self.output_buffer = old_output_buffer
+          end
+        end_src
       end
 
       # Return true if the given template was compiled for a superset of the keys in local_assigns