public function testOneToOneKey() { $place = new Place(); $place->name = 'Derry'; $place->save(); $restaurant = new Restaurant(); $restaurant->name = 'Burger mix'; $restaurant->place = $place; $restaurant->save(); $this->assertEquals(1, Restaurant::objects()->filter(['place' => $place->id])->count()); $this->assertEquals(1, $place->restaurant->pk); $restaurant->delete(); $this->assertNull($place->restaurant); }