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-rwxr-xr-xactionpack/lib/action_controller/base.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/actionpack/lib/action_controller/base.rb b/actionpack/lib/action_controller/base.rb
index 067dcacca6..b338904142 100755
--- a/actionpack/lib/action_controller/base.rb
+++ b/actionpack/lib/action_controller/base.rb
@@ -623,6 +623,8 @@ module ActionController #:nodoc:
def render_to_string(options = nil) #:doc:
result = render(options)
erase_render_results
+ @variables_added = nil
+ @template.instance_variable_set("@assigns_added", nil)
result
end