Question

这是我第一次将csv文件导入我的rails应用程序。

我在/lib/tasks/import.rake

中有以下代码

    require 'csv'
        CSV.foreach("lib/articles.csv", headers: true, encoding: "ISO8859-1") do |row|
            Article.new(title: row["Title"], body: row["Body"], user: User.find(1))
    end

当我运行rake import:articles

时

我收到此错误：

     NameError: uninitialized constant Article
    /Users/justinMgrant/code/hrsurvival/lib/tasks/import.rake:8:in `block in <top (required)>'
    /Users/justinMgrant/code/hrsurvival/lib/tasks/import.rake:7:in `<top (required)>'
    /Users/justinMgrant/.rvm/gems/ruby-2.2.1/gems/railties-4.2.2/lib/rails/engine.rb:658:in `block in run_tasks_blocks'
    /Users/justinMgrant/.rvm/gems/ruby-2.2.1/gems/railties-4.2.2/lib/rails/engine.rb:658:in `each'
    /Users/justinMgrant/.rvm/gems/ruby-2.2.1/gems/railties-4.2.2/lib/rails/engine.rb:658:in `run_tasks_blocks'
    /Users/justinMgrant/.rvm/gems/ruby-2.2.1/gems/railties-4.2.2/lib/rails/application.rb:452:in `run_tasks_blocks'
    /Users/justinMgrant/.rvm/gems/ruby-2.2.1/gems/railties-4.2.2/lib/rails/engine.rb:453:in `load_tasks'
    /Users/justinMgrant/code/hrsurvival/Rakefile:6:in `<top (required)>'
    (See full trace by running task with --trace)

知道我做错了什么吗？

Answer 1

问题是你实际上并没有在rakefile中定义你的任务。这应该可以让您运行rake import:articles。

namespace :import do

  desc 'An optional description for what the task does'
  task :articles => :environment do
    # your code goes here
  end

end

rake import:articles说要在名为articles的名称空间中查找名为import的任务，这就是为什么名称空间对于您当前正在尝试的内容所必需的。

正如@max所提到的，利用task :articles => :environment告诉任务在Rails环境的上下文中运行，这将使您的Articles模型和任何其他模型可用于该任务

Rails错误未初始化的常量导入csv

1 个答案: