Delegate to `Enumerable#find` for `CollectionProxy`

Since `Relation` includes `Enumerable`, it is enough to use `super`
simply.

activerecord/lib/active_record/associations/collection_association.rb

@@ -74,23 +74,19 @@ def reset
       end
 
       def find(*args)
-        if block_given?
-          load_target.find(*args) { |*block_args| yield(*block_args) }
-        else
-          if options[:inverse_of] && loaded?
-            args_flatten = args.flatten
-            raise RecordNotFound, "Couldn't find #{scope.klass.name} without an ID" if args_flatten.blank?
-            result = find_by_scan(*args)
-
-            result_size = Array(result).size
-            if !result || result_size != args_flatten.size
-              scope.raise_record_not_found_exception!(args_flatten, result_size, args_flatten.size)
-            else
-              result
-            end
+        if options[:inverse_of] && loaded?
+          args_flatten = args.flatten
+          raise RecordNotFound, "Couldn't find #{scope.klass.name} without an ID" if args_flatten.blank?
+          result = find_by_scan(*args)
+
+          result_size = Array(result).size
+          if !result || result_size != args_flatten.size
+            scope.raise_record_not_found_exception!(args_flatten, result_size, args_flatten.size)
           else
-            scope.find(*args)
+            result
           end
+        else
+          scope.find(*args)
         end
       end
 

activerecord/lib/active_record/associations/collection_proxy.rb

@@ -135,8 +135,9 @@ def loaded?
       #   #       #<Pet id: 2, name: "Spook", person_id: 1>,
       #   #       #<Pet id: 3, name: "Choo-Choo", person_id: 1>
       #   #    ]
-      def find(*args, &block)
-        @association.find(*args, &block)
+      def find(*args)
+        return super if block_given?
+        @association.find(*args)
       end
 
       ##