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如何解决在什么时候让CSV公司归还空洞价值?
原标题:How to solve when parsing CSV file return empty values?

我正在使用1.9.2瓦卢和3.0.7铁路。 我写了 rub背书,每15个性交时,将使用 cr工制作一个CSV文档。

背风:

 CSV.open("count.csv",  wb ,:col_sep=> , ) do |csv|
 # header row
   csv << [ id ,  count ]
   models = Model.all
   models.each do |obj|
      csv << [ obj.id, obj.get_count]
   end
 end

从以上文字中,CSV文档(上面)。 铁路评估

 CSV.foreach("count.csv", :quote_char =>  " , :col_sep => , , :row_sep =>:auto, :headers => true) do |row|
   count =  row["count"].to_i if row["id"].to_i == @id
 end 

我需要从CSV档案中划出价值。 但问题是,当处决时,我无法从CSV档案中计算出所有记录的零回报值,在完成执行之后,我可以计算价值。 但是,我总是需要估计,死胎处决是否停止或开始,谁能帮助我解决或提出任何建议? 提前感谢。

问题回答
models = Model.all
models.each do |obj|
  csv_string << [ obj.id, obj.get_count]
end

CSV.open("count.csv",  wb ,:col_sep=> , ) do |csv|
# header row
 csv << [ id ,  count ]
 csv << csv_string
end




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