如果分数相同，则RAILS 3.2中的排名相同

Question

Hi I have a ranking system wherein if they have same score or points then both users should have same rank.

I am getting it thru the index, but can't manage to make their indexes both equal if they have same score

user.rb

def get_rank
    x = User.get_rank.index(self)
    x ? (x + 1) : x
end

def self.get_rank
  Response.joins(:answer).where("answers.correct is TRUE").map(&:user).uniq.sort_by(&:score).reject{|me| me.super_admin or me.questions.count < Question.count}.reverse
end

How can I make the users who have same scores to have just 1 similar rank.

Eg if both users get 25 points, and 25 is the highest from the postings, then they must have the first rank.

Any workarounds will be appreciated

Answer 1

The question is rather confusing but I think you could make better use of the database functions. Maybe something like this works, since I don't know your full models, especially which object has the score of the user. I'm assuming its on the user object:

def get_rank
    scores = User.select(:score).joins(:response, :answers).where(:answers => [:correct => true]).order('score DESC').group(:score).all
    # example result: [24, 22, 21, 20 ...]
    rank = scores.index(score) + 1
end

The result of that statement gives you a sorted array of all actually applied scores. Since you do know the current user's score, you can get the index of that score, which is also the rank number.