I can’t figure out how to configure ef core to handle an ValueObject that needs to be persisted and used in multiple entities. I am trying to adhere to DDD. I have a ValueObject called GradingPeriod. Its a ValueObject because its determined by the Date Range and the Organization. However I can’t figure out how to persist it to the DB and also use it in multiple other entities that need to use it. Currently I have it ownedby the organization as they will be the controller of when grading periods begin and end. I need to be able to use it in things like a IEP for start and end grading periods and also in Goals or Objectives that have a grading period assigned to them.

Here is a snipped from organization:

builder.OwnsMany<GradingPeriod>(x => x.GradingPeriods, gradingPeriod =>
        {
            gradingPeriod.ToTable("organization_grading_period");
            gradingPeriod.Property<int>("Id").HasColumnName("id");
            gradingPeriod.HasKey("Id");
            gradingPeriod.Property(x => x.OrganizationId).IsRequired().HasColumnName("organization_id");
            gradingPeriod.Property(x => x.Name).IsRequired().HasMaxLength(100).HasColumnName("name");
            gradingPeriod.OwnsOne(t => t.LocalDateRange, childBuilder =>
            {
                childBuilder.Property(x => x.Start).HasColumnName("date_start");
                childBuilder.Property(x => x.End).HasColumnName("date_end");
            });
        });

Here is a snip from IEP Objective as you can see from the commented code I have been trying different things but getting different errors:

goal.OwnsMany(x => x.Objectives, objective =>
            {
                objective.ToTable("iep_objectives");
                objective.Property(x => x.Id).ValueGeneratedNever();
                goal.HasKey(x => x.Id);
                objective.Property(x => x.GoalId).IsRequired().HasColumnName("goal_id");
                objective.Property(x => x.Description).IsRequired().HasMaxLength(2000).HasColumnName("description");
                // objective.Property(x => x.GradingPeriodStart).HasColumnName("grading_period_start");
                objective.OwnsOne(x => x.GradingPeriodStart);
                objective.OwnsOne(x => x.GradingPeriodDue);
                // objective.HasOne(x => x.GradingPeriodDue).WithOne().HasPrincipalKey<GradingPeriod>(x => new {
                //     x.OrganizationId, x.Name
                // });
                // objective.Property(x => x.GradingPeriodDue).HasColumnName("grading_period_due");