public void Seed(ModelBuilder modelBuilder)
        {
            var id             = 1;
            var mappableFields = ImportFile.GetPropertyNames()
                                 .Select(x => new MappableField()
            {
                Id       = id++,
                Name     = x,
                DataType = TypeCode.String
            });

            modelBuilder.Entity <MappableField>().HasData(mappableFields);
        }