How to add configiuration to AuditableEntity that work for all the inherited entities

[akshay-tr]

Similar to this
builder.Property(t => t.CreatedBy).HasMaxLength(150);

[karimkod]

One way to achieve it is the following :

namespace CleanArchitecture.Infrastructure.Persistence.Configurations
{
    public abstract class AuditableEntityTypeConfiguration<TAuditableEntity >: IEntityTypeConfiguration<TAuditableEntity > 
         where TAuditableEntity :  AuditableEntity
    {
        public virtual void Configure(EntityTypeBuilder<TAuditableEntity> builder)
        {
            builder.Property(t => t.CreatedBy).HasMaxLength(150);
            //remaining of your auditableEntity configurations
        }
    }
}

And then your auditable entities should extend AuditableEntityConfigurationBase and call the base Configure when overriding the Configure method. Like the following :

namespace CleanArchitecture.Infrastructure.Persistence.Configurations
{
    public class TodoListConfiguration : AuditableEntityTypeConfiguration<TodoList>
    {
        public override void Configure(EntityTypeBuilder<TodoList> builder)
        {
            builder.Property(t => t.Title)
                .HasMaxLength(200)
                .IsRequired();

            builder
                .OwnsOne(b => b.Colour);

           base.Configure(builder);
        }
    }
}

But this way, you can easily forget to call base.Configure. Either keep a reminder note to check that every time or you can use something like Template Method pattern (I let you check that in details)