Query correct plan when checking for contributors.

backend/src/Squidex.Domain.Apps.Entities/Apps/DomainObject/AppDomainObject.cs

@@ -128,7 +128,9 @@ public partial class AppDomainObject : DomainObject<AppDomainObject.State>
             case AssignContributor assignContributor:
                 return UpdateReturnAsync(assignContributor, async (c, ct) =>
                 {
-                    await GuardAppContributors.CanAssign(c, Snapshot, Users, Plan);
+                    var (plan, _, _) = await UsageGate.GetPlanForAppAsync(Snapshot, false, ct);
+
+                    await GuardAppContributors.CanAssign(c, Snapshot, Users, plan);
 
                     AssignContributor(c, !Snapshot.Contributors.ContainsKey(assignContributor.ContributorId));
 
@@ -480,6 +482,11 @@ public partial class AppDomainObject : DomainObject<AppDomainObject.State>
         get => serviceProvider.GetRequiredService<IBillingManager>();
     }
 
+    private IUsageGate UsageGate
+    {
+        get => serviceProvider.GetRequiredService<IUsageGate>();
+    }
+
     private IUserResolver Users
     {
         get => serviceProvider.GetRequiredService<IUserResolver>();
@@ -489,9 +496,4 @@ public partial class AppDomainObject : DomainObject<AppDomainObject.State>
     {
         get => BillingPlans.GetFreePlan();
     }
-
-    private Plan Plan
-    {
-        get => BillingPlans.GetActualPlan(Snapshot.Plan?.PlanId).Plan;
-    }
 }

backend/src/Squidex.Infrastructure/Commands/InMemoryCommandBus.cs

@@ -17,7 +17,7 @@ public sealed class InMemoryCommandBus : ICommandBus
 
         NextDelegate next = (c, ct) => Task.CompletedTask;
 
-        foreach (var middleware in middlewares.Reverse())
+        foreach (var middleware in reverseMiddlewares)
         {
             next = Create(next, middleware);
         }

backend/tests/Squidex.Domain.Apps.Entities.Tests/Apps/DomainObject/AppDomainObjectTests.cs

@@ -30,6 +30,7 @@ public class AppDomainObjectTests : HandlerTestBase<AppDomainObject.State>
     private readonly IBillingManager billingManager = A.Fake<IBillingManager>();
     private readonly IUser user;
     private readonly IUserResolver userResolver = A.Fake<IUserResolver>();
+    private readonly IUsageGate usageGate = A.Fake<IUsageGate>();
     private readonly string contributorId = DomainId.NewGuid().ToString();
     private readonly string clientId = "client";
     private readonly string clientNewName = "My Client";
@@ -53,14 +54,14 @@ public class AppDomainObjectTests : HandlerTestBase<AppDomainObject.State>
         A.CallTo(() => userResolver.FindByIdOrEmailAsync(contributorId, default))
             .Returns(user);
 
-        A.CallTo(() => billingPlans.GetFreePlan())
-            .Returns(new Plan { Id = planIdFree, MaxContributors = 10 });
+        A.CallTo(() => usageGate.GetPlanForAppAsync(A<IAppEntity>.That.Matches(x => x.Plan != null && x.Plan.PlanId == planIdFree), false, default))
+            .Returns((new Plan { Id = planIdFree, MaxContributors = 10 }, planIdFree, null));
 
-        A.CallTo(() => billingPlans.GetPlan(planIdFree))
-            .Returns(new Plan { Id = planIdFree, MaxContributors = 10 });
+        A.CallTo(() => usageGate.GetPlanForAppAsync(A<IAppEntity>.That.Matches(x => x.Plan != null && x.Plan.PlanId == planIdPaid), false, default))
+            .Returns((new Plan { Id = planIdPaid, MaxContributors = 30 }, planIdPaid, null));
 
-        A.CallTo(() => billingPlans.GetPlan(planIdPaid))
-            .Returns(new Plan { Id = planIdPaid, MaxContributors = 30 });
+        A.CallTo(() => billingPlans.GetFreePlan())
+            .Returns(new Plan { Id = planIdFree, MaxContributors = 10 });
 
         A.CallTo(() => billingManager.MustRedirectToPortalAsync(Actor.Identifier, A<IAppEntity>._, A<string>._, default))
             .Returns(Task.FromResult<Uri?>(null));
@@ -80,9 +81,10 @@ public class AppDomainObjectTests : HandlerTestBase<AppDomainObject.State>
         var serviceProvider =
             new ServiceCollection()
                 .AddSingleton(appProvider)
-                .AddSingleton(initialSettings)
-                .AddSingleton(billingPlans)
                 .AddSingleton(billingManager)
+                .AddSingleton(billingPlans)
+                .AddSingleton(initialSettings)
+                .AddSingleton(usageGate)
                 .AddSingleton(userResolver)
                 .BuildServiceProvider();