public function test_gh27_has_many_through_with_explicit_keys()
 {
     $property = Property::first();
     $this->assert_equals(1, $property->amenities[0]->amenity_id);
     $this->assert_equals(2, $property->amenities[1]->amenity_id);
 }
 public function testGh27HasManyThroughWithExplicitKeys()
 {
     $property = Property::first();
     $this->assertEquals(1, $property->amenities[0]->amenity_id);
     $this->assertEquals(2, $property->amenities[1]->amenity_id);
 }