Entity Framework Core add unique constraint code-first

Question

I can\'t find way to add a unique constraint to my field with using attribute:

public class User
{
    [Required]
    public int Id { get; set; }

    [Requi         


        

Answer 1

Ef core support unique configuration.

protected override void OnModelCreating(ModelBuilder builder)
{
  builder.Entity()
    .HasIndex(account => account.Email)
      .IsUnique();
}

Ef core support multiple unique keys

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
  modelBuilder.Entity()
      .HasKey(account => new { account.Id, account.Email, account.RoleId });
}

Don't forget run ef core command to make migration and update the database

>> dotnet ef migrations add MigrationName -c YourDbContextName
>> dotnet ef database update -c YourDbContextName