Rails Fixnum錯誤

Question

我有一個簡單的查詢，Rails似乎是解釋爲fixnum，但我不知道爲什麼。我的代碼如下所示：

@user_with_points = Point.select("sum(points) as points, user_id").order("points desc").group("user_id") 
@user_with_points.each_with_index do |user_with_point, index|  

當我添加puts @user_with_points，它表明：

#<Point:0x6360138> 
#<Point:0x6322f38> 

不過，我收到此錯誤此錯誤：

NoMethodError: undefined method 'each' for 75:Fixnum 

將整個代碼

def self.update_overall_rank_and_points 
    @user_with_points = Point.select("sum(points) as points, user_id").order("points desc").group("user_id") 
    rank = 0 
    points = 0 

    @user_with_points.each_with_index do |user_with_point, index|   
    @user = User.find(user_with_point.user_id) 
    if user_with_point.points != points 
     points = user_with_point.points 
     rank += 1 
    end 
    @user.rank = rank 
    @user.points = user_with_point.points 
    @user.save 
    end 
end 

Answer 1

嘗試：

@user_with_points = Point.sum(:points, :group => :user_id, :order => 'sum(points)') 
@user_with_points.each do |user_id, points| 
    #... 
    user = User.find(user_id) 
    if user.points != points 
    puts "not equal!" 
    end 
end 

Answer 2

您的查詢返回一個標量值，其中點的和爲整數。你的查詢總數是75，因此是錯誤。因此，您不能對其執行each，因爲它不是枚舉。