rails 从 CSV 导入时的实例变量

Question

以下rake任务完美运行

  task :load_scadenze_data  => :environment do
    require 'csv'

    CSV.foreach("_private/scadenze.tsv", :col_sep => "\t", headers: true) do |row|

      begin
       @supplier =  Supplier.find_by_code(row[2])
       @scadenza = row[0].to_date
       if (@scadenza <= Date.today)
         @cweek_payment = 0
       else
         @cweek_payment = @scadenza.cweek
       end
       Scadenza.create(
          :data_scadenza  => row[0],
          :supplier_id => @supplier.id
       )
      rescue StandardError => e
        puts "Error importing row because '#{e.message}'"
        puts row
      end
    end
  end

然而，当将其转换为模型方法时，

def self.import(file)
  CSV.foreach(file.path, headers: true) do |row|

  begin
   @supplier =  Supplier.find_by_code(row[2])
   @scadenza = row[0].to_date
   if (@scadenza <= Date.today)
     @cweek_payment = 0
   else
     @cweek_payment = @scadenza.cweek
   end
   Scadenza.create(
      :data_scadenza  => row[0],
      :supplier_id => @supplier.id
   )
  end   
end

记录未导入，因为 Error importing row because 'Called id for nil, which would mistakenly be 4 -- if you really wanted the id of nil, use object_id'

因此 rails 框架以某种方式表现不同。处理模型方法的正确方法是什么？

Answer 1

在您的 "rake" 版本的脚本中，您正在解析 CSV：

CSV.foreach("_private/scadenze.tsv", :col_sep => "\t", headers: true)

但在您的 "model" 版本中，缺少 :col_sep 选项 - 可能它错误地解码了 CSV，并且它在 row[2] 中存储了无效值，因此无法找到正确的 Supplier?

rails 从 CSV 导入时的实例变量

rails instance variables when importing from CSV

ruby

rake

ruby-on-rails-3.2