EF Core Mapping Extensions

Extension method for mapping entities like it was possible with EF6.x and EntityTypeConfiguration<TEntity> class.

How to use it

Once you download it from GitHub or get it from Nuget you will need to create a new class that inherits from ModelTypeConfiguration<TEntity> class and implement Map() method. With the mapping in place, all that is left is to call AddMapping<TEntity>() method on an instance of ModelBuilder object.

Example

Creating a class that inherits from ModelTypeConfiguration that would target, for example, SQL Server:

using EntityFrameworkCore.MappingExtension;
using Framework.Models;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata.Builders;

namespace DataAccess.EFCore.SqlServer.Mappings
{
    public class LanguageModelTypeConfiguration: ModelTypeConfiguration<Language>
    {
        #region Overrides of ModelTypeConfiguration<Language>

        public override void Map(EntityTypeBuilder<Language> builder)
        {
            // Primary keys
            builder.HasKey(p => p.Id);

            // Columns definitions
            builder.Property(p => p.Id)
                .ValueGeneratedOnAdd();

            builder.Property(p => p.Name)
                .IsRequired()
                .ForSqlServerHasColumnType("nvarchar(150)");

            builder.Property(p => p.Code)
                .IsRequired()
                .ForSqlServerHasColumnType("nvarchar(2)");

            builder.Property(p => p.IsActive)
                .IsRequired()
                .ForSqlServerHasDefaultValue(false);

            // Table and columns mappings
            builder.ForSqlServerToTable("Languages", "local");
            builder.Property(p => p.Id).ForSqlServerHasColumnName("LanguageID");
            builder.Property(p => p.Name).ForSqlServerHasColumnName("Language");
            builder.Property(p => p.Code).ForSqlServerHasColumnName("LanguageCode");
            builder.Property(p => p.IsActive).ForSqlServerHasColumnName("Active");
        }

        #endregion
    }
} 

NOTE: In case ForSqlServer methods do not work. Fall back to the common methods by dropping ForSqlServer from the name.

The last thing is to call AddMapping in the override of OnModelCreating within the DbContext:

using DataAccess.EFCore.SqlServer.Mappings;
using EntityFrameworkCore.MappingExtension;
using Framework.Models;
using Microsoft.EntityFrameworkCore;

namespace DataAccess.EFCore.SqlServer.Contexts
{
    public class SampleContext: Microsoft.EntityFrameworkCore.DbContext
    {
        public SampleContext(DbContextOptions<SampleContext> options): base(options)
        {

        }

        public DbSet<Language> Languages { get; set; }

        #region Overrides of DbContext

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            // Call to AddMapping
            modelBuilder.AddMapping(new LanguageModelTypeConfiguration());
        }

        #endregion
    }
}