以多对多关系定义FK名称

Question

I what have many-to-many relationship between two entities. Everything works fine. Is there a way to define names of FKs in intermediate table(StoresPushNotifications)?

The reason to ask is that mysql do not allow to define long constraint names. It generates random FK in case. It breaks migration when I try to set migration to an earlier step.

[Table("Stores")]
public class StoreEntity
{
    [Key]
    public int Id { get; set; }

    public virtual ICollection<PushNotificationEntity> PushNotifications { get; set; }
}


[Table("PushNotifications")]
public class PushNotificationEntity
{
    [Key]
    public int Id { get; set; }
    public ICollection<StoreEntity> Stores { get; set; }
}

In my Context file,

modelBuilder.Entity<StoreEntity>()
    .HasMany<PushNotificationEntity>(s => s.PushNotifications)
    .WithMany(c => c.Stores)                
    .Map(cs =>
    {
        cs.MapLeftKey("StoreId");
        cs.MapRightKey("PushNotificationId");
        cs.ToTable("StoresPushNotifications");
    });

Answer 1

I had a similar problem and it was actually related to the migration key lengthrather than the foreign keys.

I resolved by modifying the migration configuration method to:

internal sealed class Configuration : DbMigrationsConfiguration<CCDatabase.CCDbContext>

public Configuration()
{
    AutomaticMigrationsEnabled = false;
    MigrationsDirectory = @"Migrations";

    SetSqlGenerator("MySql.Data.MySqlClient", new MySql.Data.Entity.MySqlMigrationSqlGenerator());

    SetHistoryContextFactory("MySql.Data.MySqlClient", (conn, schema) => new MySqlHistoryContext(conn, schema));
}

and then adding this method to limit the key lengths

public class MySqlHistoryContext : HistoryContext
{

    public MySqlHistoryContext(DbConnection connection, string defaultSchema) : base(connection, defaultSchema)
    {

    }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);

        modelBuilder.Entity<HistoryRow>().Property(h => h.MigrationId).HasMaxLength(100).IsRequired();
        modelBuilder.Entity<HistoryRow>().Property(h => h.ContextKey).HasMaxLength(200).IsRequired();
    }
}