private void Seed(ModelBuilder modelBuilder)
{
modelBuilder.Entity <User>().HasData(SeedHelper.GenerateUsers());
modelBuilder.Entity <Role>().HasData(SeedHelper.GenerateRoles());
modelBuilder.Entity <UserRoles>().HasData(SeedHelper.GenerateUserRoles());
modelBuilder.Entity <VacationStatus>().HasData(SeedHelper.GenerateVacationStatuses());
modelBuilder.Entity <VacationType>().HasData(SeedHelper.GenerateVacationTypes());
modelBuilder.Entity <VacationAvailability>().HasData(SeedHelper.GenerateVacationAvailabilities());
modelBuilder.Entity <Vacation>().HasData(SeedHelper.GenerateVacations());
}