按点排序用户（使用优点宝石）

Question

What's the best way to order a users list by their points generated by the merit gem? I'm having difficulty doing so because merit probably doesn't save it's data in the db.

So far, I'm caching merit points in the users table, I was just wondering if there's a better way.

Answer 1

In your User model, you can define the default scope:

        scope :ordered, ->{ joins('LEFT JOIN merit_scores ON ' \
                                   merit_scores.sash_id = "users".sash_id ' \
                                  'LEFT JOIN merit_score_points ON merit_score_points.score_id = merit_scores.id')
                           .group('"users".id')
                           .order('COALESCE(SUM(num_points), 0) DESC') }

Answer 2

我找到的最接近的解决方案是https://github.com/tute/merit/wiki/How-to-show-a-points-leaderboard

Answer 3

This will exclude users with no points

User.joins('RIGHT JOIN merit_scores ON merit_scores.sash_id = users.sash_id RIGHT JOIN merit_score_points ON merit_score_points.score_id = merit_scores.id')
    .group('users.id', 'merit_scores.sash_id')
    .order('SUM(num_points) DESC').limit(10)

Answer 4

Firstly, you've been down-voted by someone because your question is very ambiguous. SO is for programming-specific questions (you need to include code)

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Order

In terms of an answer, it will be to use the .order ActiveRecord function:

User.merits.order(:vote)

As you've not provided much code, any further help I try to provide would just be guesswork - no help to anyone. Maybe you could update your answer with some more details?