new DiscussionId(aDiscussionId));
Author author =
this.collaboratorService().authorFrom(new Tenant(aTenantId), anAuthorId);
Post post = discussion.post(this.forumIdentityService(), author, aSubject, aBodyText);
this.postRepository().save(post);
aDiscussionCommandResult.resultingDiscussionId(aDiscussionId);
aDiscussionCommandResult.resultingPostId(post.postId().id());