moved event firing to after savechanges

src/CleanArchitecture.Infrastructure/Data/AppDbContext.cs

@@ -20,6 +20,9 @@ namespace CleanArchitecture.Infrastructure.Data
 
         public override int SaveChanges()
         {
+            int result = base.SaveChanges();
+
+            // dispatch events only if save was successful
             var entitiesWithEvents = ChangeTracker.Entries<BaseEntity>()
                 .Select(e => e.Entity)
                 .Where(e => e.Events.Any())
@@ -34,7 +37,8 @@ namespace CleanArchitecture.Infrastructure.Data
                     _dispatcher.Dispatch(domainEvent);
                 }
             }
-            return base.SaveChanges();
+
+            return result;
         }
     }
 }
\ No newline at end of file