A rough who to connect suggestion based on mutual interests, code needs to be optimized

application_controller.rb

def who_to_connect
      @sent_invitations = current_user.sent_inv.where(:is_pending => 1).collect(&:friend_id)
      @friends = friends_list
      @friends = @friends + @sent_invitations
      
      options = %w(majors careers)
      @sug_list = []
      
      options.each do |option|
        @my_majors = eval("current_user.#{option}")
        count = 1
        hash = {}
        @my_majors.each do |major|
          hash[count] = major.users.collect(&:id)
          count = count + 1
          hash.count
        end
        
        # puts hash.keys
        user_ids =  hash.values.flatten.uniq
        user_ids = user_ids - @friends.push(current_user.id)
        
        user_ids.each do |user|
          his_interests = eval("User.find(user).#{option}.collect {|m| m.id if @my_majors.include?(m)}")
          his_interests = his_interests.uniq.compact
          @user = User.find(user)
          # user_role = User.find(user).role.name
          if @user.role.name == ("College Student" || "Counselor")
            role = "mentor"
            else
            role = "student"
          end
          
          @sug_list << {:user => user, :interests => his_interests.count, :user_type => role, :thumb => (@user.attachment.image.url(:thumb) if @user.attachment), :avatar => (@user.attachment.image.url(:thumb) if @user.attachment )}
        end
      end
      
      @final_list = []
      @sug_list.group_by {|row| row[:user] }.collect do |k,v|
        keys = v.collect {|rec| rec.keys}.flatten.uniq
        group = {}
        keys.each do |key|
          vals = v.collect { |rec| rec[key] }.uniq.compact
          group[key] = vals.size > 1 ? vals.inject{|sum,x| sum + x } : vals.first
        end
        @final_list << group
      end
      
      @sug_list = @final_list.sort_by { |my_item| my_item[:interests] }.reverse
      return @sug_list
    end