Create a refresh function

[vbonvin]

Currently, pages refreshes only when someone wants to access them, and after a given minimum amount of time (otherwise the cache version is displayed). It is in practice a good thing, but when too many people try to access a cpu-costly page at the same time, the server receives too much requests and crashes.

We need to change this. We need a refresh function that can be called e.g. through the admin panel by pressing a button, and where every pages refresh. When participants access the web site, they only see the pages that are in the cache.

[xuod]

I added an update_points function that receives the post_save signal from Round : when a round is saved, eg from the admin panel, it triggers this function that computes points for participants and teams (which were added a field points_so_far). Then all views should use this db field. That's a progress, but it's not perfect yet (some views still need to compute some scores).

[mhrz]

@xuod Could you please explain your improvement of yesterday?

[xuod]

Some detail to the optimization :

• Round model now does the computation of its scores (I call score the averaged grades of the jury for one round) and points (=scores * coefficients) when it is saved (I overrode the save function).
• Team, Participant and Problem models each have an update_scores function too that computes the total points and/or the mean scores in for each role (see Points/average grade #19 ) and save those to the database.
• in admin.py, I override the save and save_related functions, so that when a round is saved from the admin, it will :

1. save the rejections and the jury grades in the database
2. call Round.update_scores
3. call Team.update_scores for the teams participating in the round
4. each of these call Participant.update_scores for its participants
5. call Problem.update_scores