Ruby on rails 用rake任务将文件上传到rails4db，我做错了什么？

当我输入rakeimport:data时，我最终得到的错误是

    namespace :import do
           desc "imports data from a csv file"
            task :data => :environment do
            require 'csv'
            CSV.foreach('lib/tasks/file.csv') do |row|
                first = row[0]
                last = row[1]
                city = row[2]
                state = row[3]
                zipcode = row[4].to_i
                email = row[5]
                File.create(first: first, last: last, city: city, state: state, zipcode: zipcode, email: email)
            end
        end
    end

---

我做错了什么？

您要导入的模型的名称称为File？您正在调用create on File。File是Ruby中定义的类，您可能不想在应用程序中的模型中使用该名称。你可以给它命名名称空间，或者干脆给它起个更好的名字。

    rake aborted!
    NoMethodError: undefined method `create' for File:Class
    lib/tasks/import.rake:12:in `block (3 levels) in <top (required)>'
    /lib/tasks/import.rake:5:in `block (2 levels) in <top (required)>'