Type[] toArgs = toParameterizedType.getActualTypeArguments();
        checkArgument(
            fromArgs.length == toArgs.length,
            "%s not compatible with %s",
            fromParameterizedType,
            toParameterizedType);
        for (int i = 0; i < fromArgs.length; i++) {
          populateTypeMappings(mappings, fromArgs[i], toArgs[i]);
        }
      }

        Type[] toArgs = toParameterizedType.getActualTypeArguments();
        checkArgument(
            fromArgs.length == toArgs.length,
            "%s not compatible with %s",
            fromParameterizedType,
            toParameterizedType);
        for (int i = 0; i < fromArgs.length; i++) {
          populateTypeMappings(mappings, fromArgs[i], toArgs[i]);
        }
      }

	if err := DB.Create(region).Error; err != nil {
		t.Fatalf("fail to create region %v", err)
	}
	var orgs []Organization

	if err := DB.Model(&Region{}).Association("Organizations").Find(&orgs); err != nil {
		t.Fatalf("fail to find region organizations %v", err)
	} else {
		AssertEqual(t, len(orgs), 0)
	}
}

type AssociationEmptyUser struct {
	ID   uint
	Name string
	Pets []AssociationEmptyPet