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-rw-r--r--activemodel/lib/active_model/naming.rb3
1 files changed, 3 insertions, 0 deletions
diff --git a/activemodel/lib/active_model/naming.rb b/activemodel/lib/active_model/naming.rb
index 2566920d63..953d24a3b2 100644
--- a/activemodel/lib/active_model/naming.rb
+++ b/activemodel/lib/active_model/naming.rb
@@ -12,6 +12,9 @@ module ActiveModel
def initialize(klass, namespace = nil, name = nil)
name ||= klass.name
+
+ raise ArgumentError, "Class name cannot be blank. You need to supply a name argument when anonymous class given" if name.blank?
+
super(name)
@unnamespaced = self.sub(/^#{namespace.name}::/, '') if namespace