New service: get best answer

[smadbe]

Overview

On GET /items/{item_id}/best-answer

Return the best answer of the user on the given item (among all attempts). The best answer is defined as the one which gives the highest score, if there are several ones, the last (by created_at) one.

Without watched_group_id, it applies to the current-user. With it, it returns for the one for the watched participant.

Input

• item_id
• watched_group_id (optional)

Output

same as currentAnswerGet

Validations

• if watched_group_id is given, the current user must be allowed to watch "answer" of the item identified by item_id
• if watched_group_id is given, it must be a participant (= team or user)
• if watched_group_id is given, the current user must be allowed to watch the participant