In my ruby on rails project in model, I have some of definition.

class PlaySport < ActiveRecord::Base belongs_to :user belongs_to :sport

def self.getLevel end

def self.check_play_sport(cuser_id,sport_id) end

def current_playing_sport end

def all_played_sports end

end

I catch for this relation like this

current_user.play_sports.current_playing_sport

But I get the undefined method error "current_playing_sports"

What is wrong