ruby-on-rails - Rails 向数组添加元素

Question

我有一种方法可以计算给定记录集的平均值:

input = params[:recommendation_ratings].values  # The params are sent from radio_tags in my view.

input.each do |mini_params|
rating_id = mini_params[:rating_id]
l = Rating.find(rating_id) #Find record on Rating table. 
l.rating #Get value associated with rating_id
total_rating = []
total_rating << l.rating
average = total_rating.inject{ |sum, el| sum + el }.to_f / total_rating.size
puts average
end

l.rating 没有附加到 total_rating 数组。平均看跌期权打印为:

3.0
3.0
3.0
3.0
3.0

如何将返回的每个评分附加到数组以计算平均值和其他数学函数。

Answer 1

尝试:

total_rating = []    
input.each do |mini_params|
  rating_id = mini_params[:rating_id]
  l = Rating.find(rating_id) #Find record on Rating table. 
  total_rating << l.rating      
end
average = total_rating.sum / total_rating.size.to_f