4 files changed, 11 insertions, 3 deletions
diff --git a/actionpack/lib/action_view/helpers/form_helper.rb b/actionpack/lib/action_view/helpers/form_helper.rb
index 8bae6d2796..7e49052c24 100644
--- a/actionpack/lib/action_view/helpers/form_helper.rb
+++ b/actionpack/lib/action_view/helpers/form_helper.rb
@@ -991,7 +991,11 @@ module ActionView
       end
 
       def object
-        @object || @template_object.instance_variable_get("@#{@object_name}")
+        if @object
+          @object
+        elsif @template_object.instance_variable_defined?("@#{@object_name}")
+          @template_object.instance_variable_get("@#{@object_name}")
+        end
       rescue NameError
         # As @object_name may contain the nested syntax (item[subobject]) we
         # need to fallback to nil.
diff --git a/actionpack/lib/action_view/template/error.rb b/actionpack/lib/action_view/template/error.rb
index b1839b65e5..423e1e0bf5 100644
--- a/actionpack/lib/action_view/template/error.rb
+++ b/actionpack/lib/action_view/template/error.rb
@@ -52,6 +52,7 @@ module ActionView
 
       def initialize(template, assigns, original_exception)
         @template, @assigns, @original_exception = template, assigns.dup, original_exception
+        @sub_templates = nil
         @backtrace = original_exception.backtrace
       end
 
diff --git a/actionpack/lib/action_view/template/resolver.rb b/actionpack/lib/action_view/template/resolver.rb
index c9e20ca14e..a261e08dbc 100644
--- a/actionpack/lib/action_view/template/resolver.rb
+++ b/actionpack/lib/action_view/template/resolver.rb
@@ -6,6 +6,7 @@ module ActionView
   # = Action View Resolver
   class Resolver
     def initialize
+      @path = nil
       @cached = Hash.new { |h1,k1| h1[k1] =
         Hash.new { |h2,k2| h2[k2] = Hash.new { |h3, k3| h3[k3] = {} } } }
     end
diff --git a/actionpack/lib/action_view/test_case.rb b/actionpack/lib/action_view/test_case.rb
index 32fd8c5e21..de23a67cb6 100644
--- a/actionpack/lib/action_view/test_case.rb
+++ b/actionpack/lib/action_view/test_case.rb
@@ -137,8 +137,10 @@ module ActionView
       def make_test_case_available_to_view!
         test_case_instance = self
         _helpers.module_eval do
-          define_method(:_test_case) { test_case_instance }
-          private :_test_case
+          unless private_method_defined?(:_test_case)
+            define_method(:_test_case) { test_case_instance }
+            private :_test_case
+          end
         end
       end