What happened to AddOrUpdate in EF 7 / Core?

Question

I\'m writing a seed method using EntityFramework.Core 7.0.0-rc1-final.

What happened to the AddOrUpdate method of DbSet?

Answer 1

I started with Tjaart's answer and modified two things:

1. I'm using the fluent api for key designation so I'm looking for the entity's primary key instead of an attribute on the entity

2. I have change tracking turned on and was getting the error others have mentioned regarding that EF is already tracking it. This does a find on the already tracked entity and copies the values from the incoming entity to it, then updates the original entity

   public TEntity AddOrUpdate(TEntity entity)
   {
       var entityEntry = Context.Entry(entity);
   
       var primaryKeyName = entityEntry.Context.Model.FindEntityType(typeof(TEntity)).FindPrimaryKey().Properties
           .Select(x => x.Name).Single();
   
       var primaryKeyField = entity.GetType().GetProperty(primaryKeyName);
   
       var t = typeof(TEntity);
       if (primaryKeyField == null)
       {
           throw new Exception($"{t.FullName} does not have a primary key specified. Unable to exec AddOrUpdate call.");
       }
       var keyVal = primaryKeyField.GetValue(entity);
       var dbVal = DbSet.Find(keyVal);
   
       if (dbVal != null)
       {
           Context.Entry(dbVal).CurrentValues.SetValues(entity);
           DbSet.Update(dbVal);
   
           entity = dbVal;
       }
       else
       {
           DbSet.Add(entity);
       }
   
       return entity;
   }
   

I've been able to get decent mileage out of it so far without any problems.

I'm using this on EFCore 2.1