implement

dotnet/AipsCore/Domain/Abstract/DomainModel.cs

@@ -18,6 +18,11 @@ public abstract class DomainModel<TId> where TId : DomainId
         Id = id;
     }
 
+    public string GetModelName()
+    {
+        return this.GetType().Name;
+    }
+
     public IReadOnlyList<IDomainEvent> GetDomainEvents() => _domainEvents.ToList();
     
     public void ClearDomainEvents() => _domainEvents.Clear();

dotnet/AipsCore/Domain/Abstract/Validation/AbstractErrors.cs

@@ -0,0 +1,38 @@
+using AipsCore.Domain.Common.Validation;
+using AipsCore.Domain.Common.ValueObjects;
+using AipsCore.Domain.Models.Whiteboard.ValueObjects;
+
+namespace AipsCore.Domain.Abstract.Validation;
+
+public abstract class AbstractErrors<TModel, TId>
+where TModel : DomainModel<TId> 
+where TId : DomainId
+{
+    public static string GetModelName()
+    {
+        return typeof(TModel).Name;
+    }
+    
+    public static string Prefix()
+    {
+        return GetModelName().ToLower();
+    }
+
+    protected static string GetFullCode(string code)
+    {
+        return $"{Prefix()}_{code}";
+    }
+
+    protected static ValidationError CreateValidationError(string code, string errorMessage)
+    {
+        return new ValidationError(GetFullCode(code), errorMessage);
+    }
+
+    public static ValidationError NotFound(TId id)
+    {
+        const string code = "not_found";
+        string message = $"{GetModelName()} with id '{id}' was not found!";
+        
+        return CreateValidationError(code,message);
+    }
+}