graph2: Added move mutation to chapter.

models/chapters/move.go

@@ -0,0 +1,28 @@
+package chapters
+
+import (
+	"time"
+
+	"git.aiterp.net/rpdata/api/models"
+	"github.com/globalsign/mgo/bson"
+)
+
+// Move updates the chapter, moving it to the given story.
+func Move(chapter models.Chapter, story models.Story) (models.Chapter, error) {
+	now := time.Now()
+
+	err := collection.UpdateId(chapter.ID, bson.M{"$set": bson.M{"editedDate": now, "storyId": story.ID}})
+	if err != nil {
+		return models.Chapter{}, err
+	}
+
+	chapter.EditedDate = now
+
+	if chapter.CreatedDate.After(story.UpdatedDate) {
+		if err := storyCollection.UpdateId(story.ID, bson.M{"$set": bson.M{"updatedDate": chapter.CreatedDate}}); err == nil {
+			story.UpdatedDate = chapter.CreatedDate
+		}
+	}
+
+	return chapter, nil
+}