1 files changed, 15 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/name_error.rb b/activesupport/lib/active_support/core_ext/name_error.rb
new file mode 100644
index 0000000000..42b89d3d28
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/name_error.rb
@@ -0,0 +1,15 @@
+
+# Add a +missing_name+ method to NameError instances.
+class NameError < StandardError
+  
+  # Add a method to obtain the missing name from a NameError.
+  def missing_name
+    $1 if /((::)?([A-Z]\w*)(::[A-Z]\w*)*)$/ =~ message
+  end
+  
+  # Was this exception raised because the given name was missing?
+  def missing_name?(name)
+    missing_name == name.to_s
+  end
+  
+end
+\ No newline at end of file