How to Extend the Organization Unit Entity on AspNetZero

I use AspNetZero framework on my project. I see that Tenant, User and Role entities are abstract, but others are not abstract after I checked the document. I need to extend the organization unit entity to add an address column. I couldn't write the code immediately, but I started to change after read several issue and answers on the forums.

First of all, I created a class which has an inheritance from OrganizationUnit class.

    using Abp.Organizations;
    
    namespace MyProject.Organizations
    {
        public class MyOrganizationUnit : OrganizationUnit
        {
            public string Address { get; set; }
        }
    }

After dotnet ef migration add Add_Address_Column_To_OrganizationUnit process, there was two new column in the migration file. The stranger one was called 'Discriminator'. This column put a flag the data which one created with OrganizationUnit or MyOrganizationUnit repository.

migrationBuilder.AddColumn<string>(
	name: "Discriminator",
	table: "AbpOrganizationUnits",
	nullable: false,
	defaultValue: "");
	
migrationBuilder.AddColumn<string>(
	name: "Address",
	table: "AbpOrganizationUnits",
	nullable: false,
	defaultValue: "");

After dotnet ef database update process, I changed the repository with new organization unit class.

private readonly IRepository<MyOrganizationUnit, long> _organizationUnitRepository;

I run the project and checked the grids, there is no data about organization units. The problem was that discriminator column is empty. I updated Discriminator column of all rows with "MyOrganizationUnit" string value.

update dbo.AbpOrganizationUnits set Discriminator='MyOrganizationUnit'

Refresh the page. That's all.