Can the merit gem recalculate reputation and re-evaluate badges and ranks?

Question

I would like to add a system of points, ranks and badges in my rails app. The merit gem looks cool, but I want to make sure how it works before using it. The way you define badges ``` # app/models/merit/badge_rules.rb grant_on 'comments#vote', :badge => 'relevant-commenter', :to => :user do |comment| comment.votes.count == 5 end ``` and points ``` # app/models/merit/point_rules.rb score 10, :to => :post_creator, :on => 'comments#create' do |comment| comment.title.present? end ``` suggest that the action is done as a hook, just after the action (`comments#vote` or `comments#create`) in those cases. I havn't looked how the calculation/attribution of badges and points work yet so I am not sure. As my app will evolve over time, I would like to be able to change the point and badges rules and re-evaluate them. Eg: Say I first decide to grant 10 points on account activation. I would like to be able to change it to 20 and then all activated profiles are re-evaluated and get a +10 point incre…

Accepted Answer

It is possible to recompute reputation in an app with merit gem. Merit keeps the history of which actions triggered which point/badge granting in `Merit::Action` model, which is mapped to `merit_actions` table.

Following script should work (do a back up first, as I didn't do this in production yet):

```
# 1. Reset all badges/points granting
Merit::BadgesSash.delete_all
Merit::Score::Point.delete_all

# 1.1 Optionally reset activity log (badges/points granted/removed until now)
Merit::ActivityLog.delete_all

# 2. Mark all `merit_actions` as unprocessed
Merit::Action.all.map{|a| a.update_attribute :processed, false }

# 3. Recompute reputation rules
Merit::Action.check_unprocessed
Merit::RankRules.new.check_rank_rules
```

Notes on merit internals ("General merit workflow" wiki page).

Can the merit gem recalculate reputation and re-evaluate badges and ranks?

Solution

Problem