fix: ForeignKey should return strings

src/Drafter/BaseDrafter.php

@@ -63,12 +63,13 @@ protected function findPrimaryKey(Table $table): ?string
      */
     protected function findKeyToForeignTable(Table $table, string $tableName): ?string
     {
-        // Check a few common conventions
+        // Hacked 'onus' is not returned as singular because of missing regex in Framework.
+        // Remove after merge of PR.
         $tests = [
-            $tableName,
-            $tableName . '_id',
-            singular($tableName),
-            singular($tableName) . '_id',
+            $tableName !== 'onus' ? $tableName : 'onu',
+            $tableName !== 'onus' ? $tableName . '_id' : 'onu_id',
+            $tableName !== 'onus' ? singular($tableName) : 'onu',
+            $tableName !== 'onus' ? singular($tableName) . '_id' : 'onu_id',
         ];
 
         foreach ($tests as $fieldName) {

src/Structures/ForeignKey.php

@@ -21,7 +21,7 @@ public function __construct($foreignKeyData = null)
             $this->constraint_name = $foreignKeyData;
         } else {
             foreach ($foreignKeyData as $key => $value) {
-                $this->{$key} = $value;
+                $this->{$key} = is_array($value) ? $value[0] : $value;
             }
         }
     }