public static void DeleteContributions(this BikeDataDbContext dbContext, List <Contribution> contributions, List <UserContribution> userContributions)
{
dbContext.UserContributions.RemoveRange(userContributions);
dbContext.Contributions.RemoveRange(contributions);
dbContext.SaveChanges();
}
public static void SaveChanges(this BikeDataDbContext dbContext) => dbContext.SaveChanges();