loopbackio / loopbackio/loopback-next
Regression: secondary HasManyThrough inclusion fails with circular dependency
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Beschreibung
After the latest release (and possibly the one before - hard to test), a circular dependency error triggers where none did before.
Steps to reproduce
- Create 3 models, e.g. User, Participant, Conversation
- Set up bi-directional HasManyThrough relations (User through Participant to Conversation, Conversation through Participant to User)
- Use one repository to find instances of the other and include the first, e.g.
userRepo.conversations(userId).find({include:['users']}); - Execute
create:userRepo.conversations(userId).create({}); - Execute
findagain:userRepo.conversations(userId).find({include:['users']});
Current Behavior
The first execution of find succeeds. The second fails with (using Todo <-> Assignment <-> Person from linked branch):
Error: Circular dependency detected: repositories.TodoRepository --> @TodoRepository.constructor[2] --> repositories.PersonRepository --> @PersonRepository.constructor[2] --> repositories.TodoRepository
at ResolutionSession.pushBinding (/home/X/project/loopback-next/packages/context/src/resolution-session.ts:228:13)
at Function.runWithBinding (/home/X/project/loopback-next/packages/context/src/resolution-session.ts:107:13)
at Binding.getValue (/home/X/project/loopback-next/packages/context/src/binding.ts:535:40)
at TodoListApplication.getValueOrPromise (/home/X/project/loopback-next/packages/context/src/context.ts:912:32)
at TodoListApplication.get (/home/X/project/loopback-next/packages/context/src/context.ts:712:17)
at getter (/home/X/project/loopback-next/packages/context/src/inject.ts:444:16)
at fetchHasManyThroughModels (/home/X/project/loopback-next/packages/repository/src/relations/has-many/has-many-through.inclusion-resolver.ts:88:30)
at processTicksAndRejections (node:internal/process/task_queues:96:5)
at /home/X/project/loopback-next/packages/repository/src/relations/relation.helpers.ts:112:21
at async Promise.all (index 0)
at Object.includeRelatedModels (/home/X/project/loopback-next/packages/repository/src/relations/relation.helpers.ts:120:3)
Expected Behavior
Second execution of find on the HasManyThroughRepositoryFactory should succeed as well.
Link to reproduction sandbox
The Todo example at https://github.com/0x0aNL/loopback-next/tree/hmt-circdep-regression is set up with bi-directional HasManyThrough relations: Todo <-> Assignment <-> Person. A test case in src/__tests__/acceptance/todo.acceptance.ts executes:
await todoRepo.people(1).find({include: ['todos']});
await todoRepo.people(1).create({});
await todoRepo.people(1).find({include: ['todos']});
Additional information
> node -e 'console.log(process.platform, process.arch, process.versions.node)'
linux x64 16.1.0
> npm ls --prod --depth 0 | grep loopback
@loopback/example-todo@3.11.1 /home/X/project/loopback-next/examples/todo
├── @loopback/boot@3.4.1
├── @loopback/core@2.16.1
├── @loopback/repository@3.7.0
├── @loopback/rest-explorer@3.3.1
├── @loopback/rest@9.3.1
├── @loopback/service-proxy@3.2.1
├── loopback-connector-rest@4.0.1
It looks as though this regression is introduced between @loopback/repository@3.5.0 / @loopback/core@2.15.0 and @loopback/repository@3.6.0 / @loopback/core@2.16.0.
Beitragsleitfaden
Erste Schritte
- Lies das ganze Issue und danach den Beitragsleitfaden des Projekts.
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- Öffne einen Pull Request, der die Issue-Nummer nennt.
Rechercherichtung
Beginne mit packages/repository/src/relations/has-many/has-many-through.inclusion-resolver.ts und der Todo-Reproduktion in src/tests/acceptance/todo.acceptance.ts. Vergleiche die Änderungen in repository/core zwischen den Versionen 3.5.0/2.15.0 und 3.6.0/2.16.0 und führe dann die dreistufige find/create/find-Sequenz aus. Als abgeschlossen gilt, wenn der zweite eingeschlossene find ohne einen Fehler aufgrund einer zirkulären Abhängigkeit erfolgreich ist.
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Bewertung
- Tech-Stack
- nodejs, typescript
- Bereich
- backend-api-design, databases
- Issue-Typ
- Bug
- Schwierigkeit
- 4/5
- Geschätzter Aufwand
- 3-5 Tage
- Aktivitätsstatus
- Veraltet
- Klarheit
- Größtenteils klar
- Anfängerfreundlichkeit
- 35/100