thumbs_up one highest liked picture (rails)

Question

I'm having problems with the thumbs_up gem.

Here is how my app works:

Pictures act as voteable, users act as voters. They can like and dislike pictures (so the plusminus count can go negative, too). In the pictures database: user_id, :name, :image, :fame. Fame is a boolean and is by default false.

And here is what I want to do now:

Every 24 hours the picture with the highest plusminus tally gets its :fame value changed from false to true, thereby disappearing from the picture library (pictures#index) and appearing on pictures#highest. Only this one picture, changing every 24 hours.

Basically I don't know how to change the boolean of the most liked picture to true every 24 hours, and how to select the picture with the most likes. Any code is appreciated.

Answer 1

Your problem is not the thumbs_up gem.

Your problem is that you don't know how to schedule periodic tasks.

A tool that you can use for this is the Whenever gem. It lets you do stuff like this:

# in whenever
every 24.hours do
  rake "pictures:set_fame"
end

# lib/tasks/my_task.rake
namespace :pictures do
  task :set_fame => :environment do
    # N.B.: I haven't had the chance to test this query.
    Picture.where(fame: true).first.update_attribute(:fame, false)
    Picture.order('tally DESC').first.update_attribute(:fame, true)
  end
end 

Answer 2

to change the boolean value do

@pic.update_attribute(:fame, true)

for every 24 hours try using the whenever gem

https://github.com/javan/whenever

http://railscasts.com/episodes/164-cron-in-ruby

to select picture with most votes try this

@best_pic = Picture.all.sort{|a,b| b.votes.count <=> a.votes.count}.first