if user2.NamedPet == nil || user2.Account.ID != 0 {
		t.Fatalf("joins Account should not empty:%v", user2)
	}

	// NamedPet should empty
	DB.Delete(&user1.NamedPet)

	var user3 User
	DB.Model(&User{}).Joins("NamedPet").Joins("Account").First(&user3, user.ID)
	if user3.NamedPet != nil || user2.Account.ID != 0 {
		t.Fatalf("joins NamedPet and Account should not empty:%v", user2)
	}
}