fix workspace-member deletion with existing attachments/documents (#5232)

## Context
We have a non-nullable constraint on authorId in attachments and
documents, until we have soft-deletion we need to handle deletion of
workspace-members and their attachments/documents.
This PR introduces pre-hooks to deleteOne/deleteMany
This is called when a user deletes a workspace-member from the members
page

Next: needs to be done on user level as well. This is called when users
try to delete their own accounts. I've seen other issues such as
re-creating a user with a previously used email failing.

packages/twenty-server/src/modules/workspace-member/query-hooks/workspace-member-delete-many.pre-query.hook.ts

@@ -0,0 +1,14 @@
+import { Injectable, MethodNotAllowedException } from '@nestjs/common';
+
+import { WorkspacePreQueryHook } from 'src/engine/api/graphql/workspace-query-runner/workspace-pre-query-hook/interfaces/workspace-pre-query-hook.interface';
+
+@Injectable()
+export class WorkspaceMemberDeleteManyPreQueryHook
+  implements WorkspacePreQueryHook
+{
+  constructor() {}
+
+  async execute(): Promise<void> {
+    throw new MethodNotAllowedException('Method not allowed.');
+  }
+}

packages/twenty-server/src/modules/workspace-member/query-hooks/workspace-member-delete-one.pre-query.hook.ts

@@ -0,0 +1,41 @@
+import { Injectable } from '@nestjs/common';
+
+import { WorkspacePreQueryHook } from 'src/engine/api/graphql/workspace-query-runner/workspace-pre-query-hook/interfaces/workspace-pre-query-hook.interface';
+import { DeleteOneResolverArgs } from 'src/engine/api/graphql/workspace-resolver-builder/interfaces/workspace-resolvers-builder.interface';
+
+import { InjectObjectMetadataRepository } from 'src/engine/object-metadata-repository/object-metadata-repository.decorator';
+import { CommentRepository } from 'src/modules/activity/repositories/comment.repository';
+import { CommentObjectMetadata } from 'src/modules/activity/standard-objects/comment.object-metadata';
+import { AttachmentRepository } from 'src/modules/attachment/repositories/attachment.repository';
+import { AttachmentObjectMetadata } from 'src/modules/attachment/standard-objects/attachment.object-metadata';
+
+@Injectable()
+export class WorkspaceMemberDeleteOnePreQueryHook
+  implements WorkspacePreQueryHook
+{
+  constructor(
+    @InjectObjectMetadataRepository(AttachmentObjectMetadata)
+    private readonly attachmentRepository: AttachmentRepository,
+    @InjectObjectMetadataRepository(CommentObjectMetadata)
+    private readonly commentRepository: CommentRepository,
+  ) {}
+
+  // There is no need to validate the user's access to the workspace member since we don't have permission yet.
+  async execute(
+    userId: string,
+    workspaceId: string,
+    payload: DeleteOneResolverArgs,
+  ): Promise<void> {
+    const workspaceMemberId = payload.id;
+
+    await this.attachmentRepository.deleteByAuthorId(
+      workspaceMemberId,
+      workspaceId,
+    );
+
+    await this.commentRepository.deleteByAuthorId(
+      workspaceMemberId,
+      workspaceId,
+    );
+  }
+}

packages/twenty-server/src/modules/workspace-member/query-hooks/workspace-member-query-hook.module.ts

@@ -0,0 +1,27 @@
+import { Module } from '@nestjs/common';
+
+import { ObjectMetadataRepositoryModule } from 'src/engine/object-metadata-repository/object-metadata-repository.module';
+import { CommentObjectMetadata } from 'src/modules/activity/standard-objects/comment.object-metadata';
+import { AttachmentObjectMetadata } from 'src/modules/attachment/standard-objects/attachment.object-metadata';
+import { WorkspaceMemberDeleteManyPreQueryHook } from 'src/modules/workspace-member/query-hooks/workspace-member-delete-many.pre-query.hook';
+import { WorkspaceMemberDeleteOnePreQueryHook } from 'src/modules/workspace-member/query-hooks/workspace-member-delete-one.pre-query.hook';
+
+@Module({
+  imports: [
+    ObjectMetadataRepositoryModule.forFeature([
+      AttachmentObjectMetadata,
+      CommentObjectMetadata,
+    ]),
+  ],
+  providers: [
+    {
+      provide: WorkspaceMemberDeleteOnePreQueryHook.name,
+      useClass: WorkspaceMemberDeleteOnePreQueryHook,
+    },
+    {
+      provide: WorkspaceMemberDeleteManyPreQueryHook.name,
+      useClass: WorkspaceMemberDeleteManyPreQueryHook,
+    },
+  ],
+})
+export class WorkspaceMemberQueryHookModule {}