Fix user management for groups.

app/User.php

@@ -34,6 +34,7 @@ use FireflyIII\Models\Bill;
 use FireflyIII\Models\Budget;
 use FireflyIII\Models\Category;
 use FireflyIII\Models\CurrencyExchangeRate;
+use FireflyIII\Models\ObjectGroup;
 use FireflyIII\Models\PiggyBank;
 use FireflyIII\Models\Preference;
 use FireflyIII\Models\Recurrence;
@@ -256,6 +257,17 @@ class User extends Authenticatable
         return $this->hasMany(Budget::class);
     }
 
+    /**
+     * @codeCoverageIgnore
+     * Link to object groups.
+     *
+     * @return HasMany
+     */
+    public function objectGroups(): HasMany
+    {
+        return $this->hasMany(ObjectGroup::class);
+    }
+
     /**
      * @codeCoverageIgnore
      * Link to categories