Updated permission bookChildrenQuery to use QueryBuilder

@@ -318,15 +318,15 @@ class EntityRepo
      */
     public function getBookChildren(Book $book, $filterDrafts = false)
     {
-        $q = $this->permissionService->bookChildrenQuery($book->id, $filterDrafts);
+        $q = $this->permissionService->bookChildrenQuery($book->id, $filterDrafts)->get();
         $entities = [];
         $parents = [];
         $tree = [];
 
         foreach ($q as $index => $rawEntity) {
-            if ($rawEntity->entity_type === 'Bookstack\\Page') {
+            if ($rawEntity->entity_type === 'BookStack\\Page') {
                 $entities[$index] = $this->page->newFromBuilder($rawEntity);
-            } else if ($rawEntity->entity_type === 'Bookstack\\Chapter') {
+            } else if ($rawEntity->entity_type === 'BookStack\\Chapter') {
                 $entities[$index] = $this->chapter->newFromBuilder($rawEntity);
                 $key = $entities[$index]->entity_type . ':' . $entities[$index]->id;
                 $parents[$key] = $entities[$index];
@@ -338,7 +338,7 @@ class EntityRepo
 
         foreach ($entities as $entity) {
             if ($entity->chapter_id === 0) continue;
-            $parentKey = 'Bookstack\\Chapter:' . $entity->chapter_id;
+            $parentKey = 'BookStack\\Chapter:' . $entity->chapter_id;
             $chapter = $parents[$parentKey];
             $chapter->pages->push($entity);
         }

@@ -470,49 +470,35 @@ class PermissionService
         return $q;
     }
 
+    /**
+     * Get the children of a book in an efficient single query, Filtered by the permission system.
+     * @param integer $book_id
+     * @param bool    $filterDrafts
+     * @return \Illuminate\Database\Query\Builder
+     */
     public function bookChildrenQuery($book_id, $filterDrafts = false) {
-
-        // Draft setup
-        $params = [
-            'userId' => $this->currentUser()->id,
-            'bookIdPage' => $book_id,
-            'bookIdChapter' => $book_id
-        ];
-        if (!$filterDrafts) {
-            $params['userIdDrafts'] = $this->currentUser()->id;
-        }
-        // Role setup
-        $userRoles = $this->getRoles();
-        $roleBindings = [];
-        $roleValues = [];
-        foreach ($userRoles as $index => $roleId) {
-            $roleBindings[':role'.$index] = $roleId;
-            $roleValues['role'.$index] = $roleId;
-        }
-        // TODO - Clean this up, Maybe extract into a nice class for doing these kind of manual things
-        // Something which will handle the above role crap in a nice clean way
-        $roleBindingString = implode(',', array_keys($roleBindings));
-        $query = "SELECT * from (
-(SELECT 'Bookstack\\\Page' as entity_type, id, slug, name, text, '' as description, book_id, priority, chapter_id, draft FROM {$this->page->getTable()}
-    where book_id = :bookIdPage AND ". ($filterDrafts ? '(draft = 0)' : '(draft = 0 OR (draft = 1 AND created_by = :userIdDrafts))') .")
-UNION
-(SELECT 'Bookstack\\\Chapter' as entity_type, id, slug, name, '' as text, description, book_id, priority, 0 as chapter_id, 0 as draft FROM {$this->chapter->getTable()} WHERE book_id = :bookIdChapter)
-) as U  WHERE (
-	SELECT COUNT(*) FROM {$this->jointPermission->getTable()} jp
-    WHERE
-		jp.entity_id=U.id AND
-        jp.entity_type=U.entity_type AND
-		jp.action = 'view' AND
-        jp.role_id IN ({$roleBindingString}) AND
-        (
-			jp.has_permission = 1 OR
-            (jp.has_permission_own = 1 AND jp.created_by = :userId)
-        )
-) > 0
-ORDER BY draft desc, priority asc";
-
+        $pageSelect = $this->db->table('pages')->selectRaw("'BookStack\\\\Page' as entity_type, id, slug, name, text, '' as description, book_id, priority, chapter_id, draft")->where('book_id', '=', $book_id)->where(function($query) use ($filterDrafts) {
+            $query->where('draft', '=', 0);
+            if (!$filterDrafts) {
+                $query->orWhere(function($query) {
+                    $query->where('draft', '=', 1)->where('created_by', '=', $this->currentUser()->id);
+                });
+            }
+        });
+        $chapterSelect = $this->db->table('chapters')->selectRaw("'BookStack\\\\Chapter' as entity_type, id, slug, name, '' as text, description, book_id, priority, 0 as chapter_id, 0 as draft")->where('book_id', '=', $book_id);
+        $whereQuery = $this->db->table('joint_permissions as jp')->selectRaw('COUNT(*)')
+            ->whereRaw('jp.entity_id=U.id')->whereRaw('jp.entity_type=U.entity_type')
+            ->where('jp.action', '=', 'view')->whereIn('jp.role_id', $this->getRoles())
+            ->where(function($query) {
+                $query->where('jp.has_permission', '=', 1)->orWhere(function($query) {
+                    $query->where('jp.has_permission_own', '=', 1)->where('jp.created_by', '=', $this->currentUser()->id);
+                });
+            });
+        $query = $this->db->query()->select('*')->from($this->db->raw("({$pageSelect->toSql()} UNION {$chapterSelect->toSql()}) AS U"))
+            ->mergeBindings($pageSelect)->mergeBindings($chapterSelect)
+            ->whereRaw("({$whereQuery->toSql()}) > 0")->mergeBindings($whereQuery)->orderBy('draft', 'desc')->orderBy('priority', 'asc');
         $this->clean();
-        return $this->db->select($query, array_replace($roleValues, $params));
+        return  $query;
     }
 
     /**