Use instance variable directly

Author: dkniffin

lib/activeadmin_addons/support/input_helpers/input_methods.rb

@@ -23,7 +23,7 @@ def association_name
     end
 
     def method_model
-      options[:method_model] ||
+      @options[:method_model] ||
         object_class.reflect_on_association(association_name).try(:klass) ||
         association_name.classify.constantize
     end