Rails Fixnum错误

Question

我有一个简单的查询，Rails似乎在解释为fixnum，但我不确定为什么。我的代码如下所示：

@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|     

当我添加puts @user_with_points时，会显示：

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

但是，我收到此错误时出现此错误：

NoMethodError: undefined method 'each' for 75:Fixnum

添加整个代码

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

您的查询返回标量值，其中点的总和为整数。您的查询总数恰好是75，因此错误。因此，你不能对each进行反对，因为它不是枚举。

Answer 2

尝试：

@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