Group properties into classes and map them to the same table as root class in Entity Framework Core

Question

Group properties into classes and map them to the same table as root class in Entity Framework Core

asp.net-core c# ef-core-2.0 entity-framework entity-framework-core

Question

I have an entity with hundreds of properties. While it is good in database, in classes it is inconvenient. The question is, how can I group some properties of the class into other classes so it would be more convenient in programming, while keeping only one table.

Pseudocode example:

class Work {
 WorkVolumes WorkVolumes;
 ...
 SomeOtherGroupOfProperties SomeOtherGroup;
}

class WorkVolumes {
 float VolumeOfWorkType1;
 float VolumeOfWorkType2;
 ...
 float VolumeEtc;
}

class SomeOtherGroupOfProperties {
 int SomeOtherProperty;
 ...
}

While in database there is only table Work with columns VolumeOfWorkType1, VolumeOfWorkType2, VolumeEtc, SomeOtherProperty, ...

SirGordon

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SirGordon · Accepted Answer · 10/10/2017 11:41:07 AM

see "Automatic table splitting for owned entity types" here: https://blogs.msdn.microsoft.com/dotnet/2017/06/28/announcing-ef-core-2-0-preview-2/

for the following model only one table is created:

modelBuilder.Entity<Order>().OwnsOne(
    p => p.OrderDetails,
    cb =>
    {
        cb.OwnsOne(c => c.BillingAddress);
        cb.OwnsOne(c => c.ShippingAddress);
    });

public class Order
{
    public int Id { get; set; }
    public OrderDetails OrderDetails { get; set; }
}

public class OrderDetails
{
    public StreetAddress BillingAddress { get; set; }
    public StreetAddress ShippingAddress { get; set; }
}

public class StreetAddress
{
    public string Street { get; set; }
    public string City { get; set; }
}

Group properties into classes and map them to the same table as root class in Entity Framework Core

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