const workspaceMember = new WorkspaceMembers();
workspaceMember.UserId = returned.id;
workspaceMember.WorkspaceId = 1;

await this.workspaceMembersRepository.save(workspaceMember);

await this.workspaceMembersRepository.save({
	UserId: returned.id,
	WorkspaceId: 1,
});

위 2개방식 둘 다 가능, 취향차이