1 files changed, 19 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/associations/association_proxy.rb b/activerecord/lib/active_record/associations/association_proxy.rb
index f333f4d603..0c12c3737d 100644
--- a/activerecord/lib/active_record/associations/association_proxy.rb
+++ b/activerecord/lib/active_record/associations/association_proxy.rb
@@ -61,6 +61,7 @@ module ActiveRecord
         reflection.check_validity!
         Array.wrap(reflection.options[:extend]).each { |ext| proxy_extend(ext) }
         reset
+        construct_scope
       end
 
       # Returns the owner of the proxy.
@@ -203,6 +204,24 @@ module ActiveRecord
           @reflection.klass.send :with_scope, *args, &block
         end
 
+        # Construct the scope used for find/create queries on the target
+        def construct_scope
+          @scope = {
+            :find   => construct_find_scope,
+            :create => construct_create_scope
+          }
+        end
+        
+        # Implemented by subclasses
+        def construct_find_scope
+          raise NotImplementedError
+        end
+        
+        # Implemented by (some) subclasses
+        def construct_create_scope
+          {}
+        end
+
       private
         # Forwards any missing method call to the \target.
         def method_missing(method, *args)