Baustein 4: Repositories verdrahten Teil B (Kaskaden & Batch, Kapitel 10)
Die heiklen Faelle, die nicht ueber die oeffentliche Save/Delete-Methode laufen, sondern mehrere Collections direkt anfassen: GroupRepository (Save + Delete-Kaskade), ExamRepository.Delete, ExamResultRepository (Save/SaveMany), DocumentationRepository (Save/Delete/HardDelete), ParticipationSessionRepository.Delete, ParticipationRepository (SaveMany/DeleteBySession), CompetencyDomainRepository (inkl. Replace- /DeleteBySubjectAndGrade). Regel: pro oeffentlichem Repository-Aufruf genau EIN Sync-Ereignis (z.B. GroupRepository.Delete -> ein Group/Delete-Ereignis, nicht 14), Batch-Methoden feuern ein Ereignis pro betroffener Entitaet. Dafuer ExamRepository.Delete/ParticipationSessionRepository.Delete/ DocumentationRepository.HardDelete auf die in Baustein 2 vorbereiteten LiteDbContext-Kaskadenhelfer umgestellt (CascadeDeleteExam, CascadeDeleteParticipationSession, CascadeHardDeleteDocumentation) - dieselbe Kaskade existiert dadurch nur an einer Stelle im Code, nicht doppelt (wichtig fuer Baustein 5, wo ein eingehendes Sync-Ereignis sie erneut braucht). Tests pruefen explizit die Ereignis-Anzahl bei Kaskaden/Batches. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Claude Sonnet 5
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using LehrerApp.Core.Models;
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using LehrerApp.Data.Repositories;
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using Xunit;
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namespace LehrerApp.Data.Tests;
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// Baustein 4: pro öffentlichem Repository-Aufruf genau EIN Sync-Ereignis, auch wenn die
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// eigentliche Kaskade mehrere Collections betrifft. Batch-Methoden feuern ein Ereignis pro
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// betroffener Entität.
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public sealed class ChangeHookCascadeTests
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{
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private static LiteDbContext NewInMemoryContext() => new(new MemoryStream());
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[Fact]
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public void GroupRepository_Delete_LoestGenauEinEreignisAusTrotzKaskade()
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{
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using var db = NewInMemoryContext();
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var groupRepo = new GroupRepository(db);
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var group = new LearningGroup { Name = "8a", SchoolYear = "2025/26" };
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groupRepo.Save(group);
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db.Grades.Insert(new Grade { GroupId = group.Id, StudentId = Guid.NewGuid() });
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db.Exams.Insert(new Exam { GroupId = group.Id });
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var calls = new List<(string EntityType, string Operation)>();
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db.OnChange = (type, id, op, payload) => calls.Add((type, op));
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groupRepo.Delete(group.Id);
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var call = Assert.Single(calls);
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Assert.Equal((nameof(LearningGroup), "Delete"), call);
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}
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[Fact]
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public void ExamRepository_Delete_LoestGenauEinEreignisAusTrotzErgebnisKaskade()
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{
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using var db = NewInMemoryContext();
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var repo = new ExamRepository(db);
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var exam = new Exam { GroupId = Guid.NewGuid() };
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repo.Save(exam);
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db.ExamResults.Insert(new ExamResult { ExamId = exam.Id, StudentId = Guid.NewGuid() });
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db.ExamResults.Insert(new ExamResult { ExamId = exam.Id, StudentId = Guid.NewGuid() });
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var calls = new List<(string EntityType, string Operation)>();
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db.OnChange = (type, id, op, payload) => calls.Add((type, op));
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repo.Delete(exam.Id);
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var call = Assert.Single(calls);
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Assert.Equal((nameof(Exam), "Delete"), call);
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}
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[Fact]
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public void ParticipationSessionRepository_Delete_LoestGenauEinEreignisAusTrotzEintragKaskade()
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{
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using var db = NewInMemoryContext();
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var repo = new ParticipationSessionRepository(db);
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var session = new ParticipationSession { GroupId = Guid.NewGuid() };
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repo.Save(session);
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db.ParticipationEntries.Insert(new ParticipationEntry { SessionId = session.Id, StudentId = Guid.NewGuid() });
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var calls = new List<(string EntityType, string Operation)>();
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db.OnChange = (type, id, op, payload) => calls.Add((type, op));
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repo.Delete(session.Id);
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var call = Assert.Single(calls);
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Assert.Equal((nameof(ParticipationSession), "Delete"), call);
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}
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[Fact]
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public void ExamResultRepository_SaveMany_LoestEinEreignisProEintragAus()
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{
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using var db = NewInMemoryContext();
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var repo = new ExamResultRepository(db);
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var results = new List<ExamResult>
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{
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new() { ExamId = Guid.NewGuid(), StudentId = Guid.NewGuid() },
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new() { ExamId = Guid.NewGuid(), StudentId = Guid.NewGuid() },
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new() { ExamId = Guid.NewGuid(), StudentId = Guid.NewGuid() },
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};
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var calls = new List<(string EntityType, string EntityId, string Operation)>();
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db.OnChange = (type, id, op, payload) => calls.Add((type, id, op));
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repo.SaveMany(results);
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Assert.Equal(3, calls.Count);
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Assert.All(calls, c => Assert.Equal((nameof(ExamResult), "Save"), (c.EntityType, c.Operation)));
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Assert.Equal(results.Select(r => r.Id.ToString()).OrderBy(x => x), calls.Select(c => c.EntityId).OrderBy(x => x));
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}
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[Fact]
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public void ParticipationRepository_SaveMany_LoestEinEreignisProEintragAus()
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{
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using var db = NewInMemoryContext();
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var repo = new ParticipationRepository(db);
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var sessionId = Guid.NewGuid();
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var entries = new List<ParticipationEntry>
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{
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new() { SessionId = sessionId, StudentId = Guid.NewGuid() },
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new() { SessionId = sessionId, StudentId = Guid.NewGuid() },
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};
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var calls = new List<(string EntityType, string Operation)>();
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db.OnChange = (type, id, op, payload) => calls.Add((type, op));
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repo.SaveMany(entries);
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Assert.Equal(2, calls.Count);
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Assert.All(calls, c => Assert.Equal((nameof(ParticipationEntry), "Save"), c));
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}
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[Fact]
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public void ParticipationRepository_DeleteBySession_LoestEinEreignisProEintragAus()
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{
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using var db = NewInMemoryContext();
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var repo = new ParticipationRepository(db);
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var sessionId = Guid.NewGuid();
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repo.Save(new ParticipationEntry { SessionId = sessionId, StudentId = Guid.NewGuid() });
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repo.Save(new ParticipationEntry { SessionId = sessionId, StudentId = Guid.NewGuid() });
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var calls = new List<(string EntityType, string Operation)>();
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db.OnChange = (type, id, op, payload) => calls.Add((type, op));
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repo.DeleteBySession(sessionId);
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Assert.Equal(2, calls.Count);
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Assert.All(calls, c => Assert.Equal((nameof(ParticipationEntry), "Delete"), c));
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}
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[Fact]
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public void CompetencyDomainRepository_ReplaceForSubjectAndGrade_LoestDeleteFuerAlteUndSaveFuerNeueAus()
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{
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using var db = NewInMemoryContext();
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var repo = new CompetencyDomainRepository(db);
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var subjectId = Guid.NewGuid();
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repo.Save(new CompetencyDomain { SubjectId = subjectId, GradeLevel = 8, Name = "Alt" });
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var calls = new List<(string EntityType, string Operation)>();
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db.OnChange = (type, id, op, payload) => calls.Add((type, op));
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repo.ReplaceForSubjectAndGrade(subjectId, 8,
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[
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new CompetencyDomain { Name = "Neu 1" },
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new CompetencyDomain { Name = "Neu 2" },
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]);
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Assert.Equal(3, calls.Count);
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Assert.Equal(1, calls.Count(c => c.Operation == "Delete"));
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Assert.Equal(2, calls.Count(c => c.Operation == "Save"));
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Assert.All(calls, c => Assert.Equal(nameof(CompetencyDomain), c.EntityType));
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}
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[Fact]
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public void CompetencyDomainRepository_DeleteBySubjectAndGrade_LoestEinEreignisProDomaenAus()
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{
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using var db = NewInMemoryContext();
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var repo = new CompetencyDomainRepository(db);
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var subjectId = Guid.NewGuid();
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repo.Save(new CompetencyDomain { SubjectId = subjectId, GradeLevel = 8, Name = "A" });
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repo.Save(new CompetencyDomain { SubjectId = subjectId, GradeLevel = 8, Name = "B" });
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var calls = new List<(string EntityType, string Operation)>();
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db.OnChange = (type, id, op, payload) => calls.Add((type, op));
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repo.DeleteBySubjectAndGrade(subjectId, 8);
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Assert.Equal(2, calls.Count);
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Assert.All(calls, c => Assert.Equal((nameof(CompetencyDomain), "Delete"), c));
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}
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[Fact]
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public void DocumentationRepository_Delete_LoestSaveMitIsDeletedAus()
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{
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using var db = NewInMemoryContext();
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var repo = new DocumentationRepository(db);
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var doc = new Documentation { StudentId = Guid.NewGuid(), Title = "Gespräch" };
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repo.Save(doc);
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var calls = new List<(string EntityType, string Operation, object? Payload)>();
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db.OnChange = (type, id, op, payload) => calls.Add((type, op, payload));
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repo.Delete(doc.Id);
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var call = Assert.Single(calls);
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Assert.Equal((nameof(Documentation), "Save"), (call.EntityType, call.Operation));
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Assert.True(((Documentation)call.Payload!).IsDeleted);
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}
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[Fact]
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public void DocumentationRepository_HardDelete_LoestDeleteAus()
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{
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using var db = NewInMemoryContext();
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var repo = new DocumentationRepository(db);
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var doc = new Documentation { StudentId = Guid.NewGuid(), Title = "Gespräch" };
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repo.Save(doc);
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var calls = new List<(string EntityType, string Operation)>();
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db.OnChange = (type, id, op, payload) => calls.Add((type, op));
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repo.HardDelete(doc.Id);
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var call = Assert.Single(calls);
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Assert.Equal((nameof(Documentation), "Delete"), call);
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}
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}
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