hhorne / EfModelComposer

An easier way of loading EntityFramework type configurations.

##EfModelComposer

Manually adding and maintaining EntityFramework type configurations can be a pain. K Scott Allen wrote a great blog post showing how to use MEF in order to add configurations in a scalable way. This library packages the provided approach into a pluggable way.

Install from Nuget

Install-Package EfModelComposer

Example Usage

class FooContext : DbContext
{
	...
	protected override void OnModelCreating(DbModelBuilder modelBuilder)
	{
		modelBuilder.ComposeModelConfiguration(Assembly.GetExecutingAssembly());
		base.OnModelCreating(modelBuilder);
	}
	...
}

class City
{
	public int Id { get; set; }
	public string Name { get; set; }
}

[ExportConfiguration]
class CityConfig : EntityConfiguration<City>
{
	public CityConfig()
	{
		Property(c => c.Name).HasMaxLength(100);
	}
}

Once your DbContext is configured to call the ComposeModelConfiguration extension method any exported EntityConfiguration (a derived type of EntityTypeConfiguration) will be automatically found and loaded when OnModelCreating is called.