I have the following BaseballDbContext
class:
public class BaseballDbContext : DbContext
{
public DbSet<BaseballTeam> teams { get; set; }
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<Hitter>();
modelBuilder.Entity<Pitcher>();
}
}
And my model classes are:
public class BaseballTeam
{
public int Id { get; set; }
public string teamName { get; set; }
public List<BaseballPlayer> players { get; set; }
}
public abstract class BaseballPlayer
{
public int Id { get; set; }
public int age { get; set; }
public string name { get; set; }
}
public class Hitter : BaseballPlayer
{
public int homeruns { get; set; }
}
public class Pitcher : BaseballPlayer
{
public int strikeouts { get; set; }
}
Initially seeded data in the players table:
Now I want to update name
and homeruns
property of one of the hitters:
BaseballTeam team = _ctx.teams.Include(q => q.players).FirstOrDefault();
Hitter hitter = team.players.OfType<Hitter>().FirstOrDefault();
hitter.name = "Tulowitzki"; //that property will be updated
hitter.homeruns = 399; //but that will not :(
int i = team.players.FindIndex(q => q.Id == hitter.Id);
team.players[i] = hitter;
_ctx.Update(team);
_ctx.SaveChanges();
After I run the code only player's name got update, but not the homeruns property:
How to update property of both child and parent class ?
From this answer but this is a workaround : Save changes to child class properties using base class query with Entity Framework TPH patten :
Do Not track changes using AsNoTracking()
using (var context = new BaseballDbContext())
{
var team = context.teams.Include(q => q.players).AsNoTracking().FirstOrDefault();
var hitter = team.players.OfType<Hitter>().FirstOrDefault();
hitter.name = "Donaldson";
hitter.homeruns = 999;
context.Update(team);
context.SaveChanges();
}
I think you should have a look at the opened issues related to inheritance and may be open a new issue
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