Atomic_promote fix

lib/shrine/plugins/mongoid.rb

@@ -97,10 +97,18 @@ def mongoid_persist
 
         # Yields the reloaded record. Used by the _persistence plugin.
         def mongoid_reload
-          record_copy    = record.dup
-          record_copy.id = record.id
-
-          record_copy.reload unless record_copy.embedded?
+          if record.embedded?
+            parent_copy    = record._parent.dup
+            parent_copy.id = record._parent.id
+            parent_copy.reload
+            record_copy = parent_copy._children.select do |child|
+              child.id == record.id
+            end[0]
+          else
+            record_copy    = record.dup
+            record_copy.id = record.id
+            record_copy.reload
+          end
 
           yield record_copy
         end

test/mongoid_test.rb

@@ -639,6 +639,22 @@ def validate
             assert_equal file, attacher.file
           end
         end
+
+        describe "#atomic_promote" do
+          it "promotes cached file to permanent storage" do
+            photo = Photo.new(user: @user)
+            attacher = @shrine::Attacher.from_model(photo, :image)
+
+            attacher.attach_cached(fakeio)
+            photo.save
+
+            attacher.atomic_promote
+
+            assert attacher.stored?
+            attacher.reload
+            assert attacher.stored?
+          end
+        end
       end
     end
   end