⚗️ Try things out, in accordance with wiki UML

Sources/App/Program.cs

@@ -32,12 +32,12 @@ namespace App
             }
 
             // DB stuff when the app opens
-
-            // Later, we'll use a GameDBRunner
-            using (PlayerDbManager playerDBManager = new(new DiceAppDbContext()))
+            using (DiceAppDbContext db = new())
             {
+                // Later, we'll use the DiceAppDbContext to get a GameDbRunner
+
                 // get all the players from the DB
-                IEnumerable<PlayerEntity> entities = playerDBManager.GetAll();
+                IEnumerable<PlayerEntity> entities = db.Players;
 
                 foreach (PlayerEntity entity in entities)
                 {
@@ -147,16 +147,19 @@ namespace App
             }
 
             // DB stuff when the app closes
-            using (PlayerDbManager playerDBManager = new(new DiceAppDbContext()))
+            using (DiceAppDbContext db = new())
             {
                 // get all the players from the app's memory
                 IEnumerable<Player> models = gameRunner.GlobalPlayerManager.GetAll();
 
+                // create a PlayerDbManager (and inject it with the DB)
+                PlayerDbManager playerDbManager = new(db);
+
                 foreach (Player model in models)
                 {
                     try // to persist them
                     { // as entities !
-                        playerDBManager.Add(model.ToEntity());
+                        playerDbManager.Add(model.ToEntity());
                     }
                     // what if there's already a player with that name? Exception (see PlayerEntity's annotations)
                     catch (ArgumentException ex) { Debug.WriteLine($"{ex.Message}\n... Never mind"); }
@@ -294,7 +297,6 @@ namespace App
             {
                 Console.WriteLine("write the name of a dice group you want to add (at least one), or 'ok' if you're finished");
                 menuChoiceDice = Console.ReadLine();
-                //  no checks, this is temporary
                 if (!menuChoiceDice.Equals("ok"))
                 {
                     IEnumerable<Die> chosenDice = gameRunner.GlobalDieManager.GetOneByName(menuChoiceDice).Value;

Sources/Data/EF/DiceAppDbContext.cs

@@ -1,10 +1,16 @@
 using Data.EF.Players;
 using Microsoft.EntityFrameworkCore;
+using Model.Games;
 
 namespace Data.EF
 {
-    public class DiceAppDbContext : DbContext
+    public class DiceAppDbContext : DbContext, ILoader
     {
+        public virtual GameRunner LoadApp()
+        {
+            throw new NotImplementedException();
+        }
+
         public DbSet<PlayerEntity>? Players { get; set; }
 
         protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)

Sources/Data/EF/DiceAppDbContextWithStub.cs

@@ -1,20 +1,27 @@
 using Data.EF.Players;
 using Microsoft.EntityFrameworkCore;
+using Model.Games;
+using System.Security.Cryptography.X509Certificates;
 
 namespace Data.EF
 {
     public class DiceAppDbContextWithStub : DiceAppDbContext
     {
+        public override GameRunner LoadApp()
+        {
+            throw new NotImplementedException();
+        }
+
         protected override void OnModelCreating(ModelBuilder modelBuilder)
         {
             base.OnModelCreating(modelBuilder);
 
             modelBuilder.Entity<PlayerEntity>().HasData(
-                new PlayerEntity { ID = Guid.Parse("e3b42372-0186-484c-9b1c-01618fbfac44"), Name = "Alice" },
-                new PlayerEntity { ID = Guid.Parse("73265e15-3c43-45f8-8f5d-d02feaaf7620"), Name = "Bob" },
-                new PlayerEntity { ID = Guid.Parse("5198ba9d-44d6-4660-85f9-1843828c6f0d"), Name = "Clyde" },
-                new PlayerEntity { ID = Guid.Parse("386cec27-fd9d-4475-8093-93c8b569bf2e"), Name = "Dahlia" }
-                );
+            new PlayerEntity { ID = Guid.Parse("e3b42372-0186-484c-9b1c-01618fbfac44"), Name = "Alice" },
+            new PlayerEntity { ID = Guid.Parse("73265e15-3c43-45f8-8f5d-d02feaaf7620"), Name = "Bob" },
+            new PlayerEntity { ID = Guid.Parse("5198ba9d-44d6-4660-85f9-1843828c6f0d"), Name = "Clyde" },
+            new PlayerEntity { ID = Guid.Parse("386cec27-fd9d-4475-8093-93c8b569bf2e"), Name = "Dahlia" }
+            );
         }
     }
 }

Sources/Data/EF/Players/PlayerDbManager.cs

@@ -3,7 +3,7 @@ using Model;
 
 namespace Data.EF.Players
 {
-    public sealed class PlayerDbManager : IManager<PlayerEntity>, IDisposable
+    public sealed class PlayerDbManager : IManager<PlayerEntity>
     {
         private readonly DiceAppDbContext db;
         public PlayerDbManager(DiceAppDbContext db)
@@ -11,11 +11,6 @@ namespace Data.EF.Players
             this.db = db;
         }
 
-        public void Dispose()
-        {
-            db.Dispose();
-        }
-
         public PlayerEntity Add(PlayerEntity toAdd)
         {
             if (db.Players!.Where(entity => entity.Name == toAdd.Name).Any())