diff --git a/DataStorage/Database/DataMapperAbstract.php b/DataStorage/Database/DataMapperAbstract.php
index 63fef93e1..4f64b3c66 100644
--- a/DataStorage/Database/DataMapperAbstract.php
+++ b/DataStorage/Database/DataMapperAbstract.php
@@ -134,7 +134,7 @@ abstract class DataMapperAbstract implements DataMapperInterface
     /**
      * Fields to load.
      *
-     * @var string[]
+     * @var array[]
      * @since 1.0.0
      */
     protected $fields = [];
@@ -404,6 +404,8 @@ abstract class DataMapperAbstract implements DataMapperInterface
 
                     if (isset(static::$hasMany[$pname]['mapper']) && static::$hasMany[$pname]['mapper'] === static::$hasMany[$pname]['relationmapper']) {
                         $relReflectionClass = new \ReflectionClass(get_class($temp));
+                    } else {
+                        // todo: init other $relReflectionClass?!
                     }
 
                     foreach ($values as $key => &$value) {
@@ -853,13 +855,14 @@ abstract class DataMapperAbstract implements DataMapperInterface
      * Get all by custom query.
      *
      * @param Builder $query Query
+     * @param bool $relations Relations
      *
      * @return array
      *
      * @since  1.0.0
      * @author Dennis Eichhorn <d.eichhorn@oms.com>
      */
-    public function getAllByQuery(Builder $query) : array
+    public function getAllByQuery(Builder $query, bool $relations = true) : array
     {
         $sth = $this->db->con->prepare($query->toSql());
         $sth->execute();
diff --git a/Math/Matrix/Matrix.php b/Math/Matrix/Matrix.php
index b639f6e6b..4e5a3081f 100644
--- a/Math/Matrix/Matrix.php
+++ b/Math/Matrix/Matrix.php
@@ -339,7 +339,7 @@ class Matrix implements ArrayAccess, Iterator
         }
 
         $trianglize = $this->matrix;
-        $prod = $this->(upperTrianglize($trianglize));
+        $prod = $this->upperTrianglize($trianglize);
 
         for($i = 0; $i < $this->n; $i++) {
             $prod *= $trianglize[$i][$i];
diff --git a/Math/Number/Numbers.php b/Math/Number/Numbers.php
index 153445f12..4ab9bf792 100644
--- a/Math/Number/Numbers.php
+++ b/Math/Number/Numbers.php
@@ -64,8 +64,9 @@ class Numbers
      */
     public static function selfdescribing(int $n) : bool 
     {
-        foreach (str_split($n) as $place => $value) {
-            if (substr_count($number, $place) != $value) { 
+        $split = str_split($n);
+        foreach ($split as $place => $value) {
+            if (substr_count($n, $place) != $value) { 
                 return false;
             }
         }
@@ -85,7 +86,7 @@ class Numbers
      */
     public static function isSquare(int $n) : bool
     {
-        $goodMask; // 0xC840C04048404040 computed below
+        $goodMask = 0xC840C04048404040; // 0xC840C04048404040 computed below
 
         for ($i = 0; $i < 64; ++$i) {
             $goodMask |= PHP_INT_MIN >> ($i*$i);