CODEWITHSUNDEEP
entity-frameworkef-code-firstentity-framework-migrations
Igoris
Igoris

Reputation: 1650

Entity framework add-migration scaffold with custom Migration base

I need to scaffold migration with add-migration from Package Manager Console with my custom Migration base CustomMigration which is derived from DbMigration.

public partial class NewMigration: CustomMigration
{
    public override void Up()
    {
    }

    public override void Down()
    {
    }
}

I can use different command if needed. I don't have any skills in powershell scripting. How can i achieve this?

Upvotes: 2

Views: 2152

Answers (2)

Igoris
Igoris

Reputation: 1650

I Created new class which generated my migrations:

public class AuditMigrationCodeGenerator : CSharpMigrationCodeGenerator
{
    protected override void WriteClassStart(string @namespace, string className, IndentedTextWriter writer, string @base, bool designer = false, IEnumerable<string> namespaces = null)
    {
        @base = @base == "DbMigration" ? "AuditMigration" : @base;
        var changedNamespaces = namespaces?.ToList() ?? new List<string>();
        changedNamespaces.Add("Your.Custom.Namespace");
        base.WriteClassStart(@namespace, className, writer, @base, designer, changedNamespaces);
    }
}

In Configuration.cs :

internal sealed class Configuration : DbMigrationsConfiguration<EfDataAccess>
{
    public Configuration()
    {
        this.AutomaticMigrationsEnabled = false;
        CodeGenerator = new AuditMigrationCodeGenerator();
    }
}

And it will use your Custom code generator, which generates migrations with my desired custom migration base.

For more info: https://romiller.com/2012/11/30/code-first-migrations-customizing-scaffolded-code/

Upvotes: 7

Timur Lemeshko
Timur Lemeshko

Reputation: 2879

  1. run command add-migration NewMigration. It will add new migration with name "NewMigration". If there is no changes in model, the migration will be empty:

    public partial class NewMigration : DbMigration
{
    public override void Up()
    {
    }

    public override void Down()
    {
    }
}

  2. Change base class of NewMigration to CustomMigration:

    public partial class NewMigration : CustomMigration
{
    public override void Up()
    {
    }

    public override void Down()
    {
    }
}
  3. modify NewMigration as you wish
  4. run update-database to apply migration

Upvotes: 0

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