Added cross-book page/chapter sorting

app/Repos/BookRepo.php

@@ -35,6 +35,16 @@ class BookRepo
         return $this->book->where('slug', '=', $slug)->first();
     }
 
+    /**
+     * Checks if a book exists.
+     * @param $id
+     * @return bool
+     */
+    public function exists($id)
+    {
+        return $this->book->where('id', '=', $id)->exists();
+    }
+
     /**
      * Get a new book instance from request input.
      * @param $input

app/Repos/ChapterRepo.php

@@ -80,4 +80,15 @@ class ChapterRepo
         return $chapters;
     }
 
+    public function setBookId($bookId, Chapter $chapter)
+    {
+        $chapter->book_id = $bookId;
+        foreach($chapter->activity as $activity) {
+            $activity->book_id = $bookId;
+            $activity->save();
+        }
+        $chapter->save();
+        return $chapter;
+    }
+
 }

app/Repos/PageRepo.php

@@ -186,6 +186,17 @@ class PageRepo
         return $query->count() > 0;
     }
 
+    public function setBookId($bookId, Page $page)
+    {
+        $page->book_id = $bookId;
+        foreach($page->activity as $activity) {
+            $activity->book_id = $bookId;
+            $activity->save();
+        }
+        $page->save();
+        return $page;
+    }
+
     /**
      * Gets a suitable slug for the resource
      *