Possible to default DateTime field to GETDATE() with Entity Framework Migrations?

Question

I added EntityFramework.Migrations (Beta 1) to an existing Code-First app that is going through some changes (for both migration capabilities and more fine-tuning of the tab

Answer 1

I recently ran in to this issue in EF6 (since they still haven't fixed it). The easiest way I found to do it without having to manually modify the Migration class is to override the CodeGenerator in your Configuration class.

By creating a class that implements MigrationCodeGenerator and then overriding the Generate method you can iterate through all of the operations and apply what ever modifications you want.

Once your modifications have been made, you can then initialize your the CSharpMigrationCodeGenerator and return its default value.

public class ExtendedMigrationCodeGenerator : MigrationCodeGenerator
{
    public override ScaffoldedMigration Generate(string migrationId, IEnumerable<MigrationOperation> operations, string sourceModel, string targetModel, string @namespace, string className)
    {
        foreach (MigrationOperation operation in operations)
        {
            if (operation is CreateTableOperation)
            {
                foreach (var column in ((CreateTableOperation)operation).Columns)
                    if (column.ClrType == typeof(DateTime) && column.IsNullable.HasValue && !column.IsNullable.Value && string.IsNullOrEmpty(column.DefaultValueSql))
                        column.DefaultValueSql = "GETDATE()";
            }
            else if (operation is AddColumnOperation)
            {
                ColumnModel column = ((AddColumnOperation)operation).Column;

                if (column.ClrType == typeof(DateTime) && column.IsNullable.HasValue && !column.IsNullable.Value && string.IsNullOrEmpty(column.DefaultValueSql))
                    column.DefaultValueSql = "GETDATE()";
            }
        }

        CSharpMigrationCodeGenerator generator = new CSharpMigrationCodeGenerator();

        return generator.Generate(migrationId, operations, sourceModel, targetModel, @namespace, className);
    }
}

internal sealed class Configuration : DbMigrationsConfiguration<Project.Models.Context.DatabaseContext>
{
    public Configuration()
    {
        AutomaticMigrationsEnabled = false;
        MigrationsDirectory = @"Migrations";
        this.CodeGenerator = new ExtendedMigrationCodeGenerator();
    }
}

I hope this helps