rake aborted! NameError: uninitialized constant even add :enviroment to task

Question

我是 RoR 的新手，正在尝试通过在 lib/spreadsheet 下创建一个导入器来创建一个从 google 电子表格导入数据库的任务。但是即使我根据 SOF 中的其他一些问题将 :environment 添加到任务中，rake 也找不到我的进口商。这是我的文件

lib/spreadsheet/importer.rb

class SpreadSheet::Importer
  def initialize
    @session = GoogleDrive.saved_session("#{Rails.root}/config/google_drive/config.json")
  end

  def exec(table_name)
    #do something
  end
end

lib/tasks/spreadsheet.rake

namespace :spreadsheet do
  task :get => :environment do
    importer = Spreadsheet::Importer.new
    importer.exec
  end
end

错误：

rake aborted!

NameError: uninitialized constant SpreadSheet

/home/vagrant/workspace/ruby/kuwata-summer/lib/tasks/spreadsheet.rake:1:in <top (required)>

/home/vagrant/workspace/ruby/kuwata-summer/vendor/bundle/ruby/2.3.0 /gems/railties-5.0.0/lib/rails/engine.rb:654:in block in run_tasks_blocks

/home/vagrant/workspace/ruby/kuwata-summer/vendor/bundle/ruby/2.3.0/gems/railties-5.0.0/lib/rails/engine.rb:654:in each

/home/vagrant/workspace/ruby/kuwata-summer/vendor/bundle/ruby/2.3.0/gems/railties-5.0.0/lib/rails/engine.rb:654:in run_tasks_blocks

/home/vagrant/workspace/ruby/kuwata-summer/vendor/bundle/ruby/2.3.0/gems/railties-5.0.0/lib/rails/application.rb:443:in run_tasks_blocks

/home/vagrant/workspace/ruby/kuwata-summer/vendor/bundle/ruby/2.3.0/gems/railties-5.0.0/lib/rails/engine.rb:457:in load_tasks

/home/vagrant/workspace/ruby/kuwata-summer/rakefile:6:in <top (required)>

/home/vagrant/workspace/ruby/kuwata-summer/vendor/bundle/ruby/2.3.0/gems/rake-11.2.2/exe/rake:27:in <top (required)>

/home/vagrant/.rbenv/versions/2.3.1/bin/bundle:23:in load

/home/vagrant/.rbenv/versions/2.3.1/bin/bundle:23:in <main>

(See full trace by running task with --trace)

Answer 1

大写很重要。

Spreadsheet 已定义； SpreadSheet 不是。

这就是您的代码在尝试定义 SpreadSheet::Importer.

时抛出错误的原因

...或者至少，根据我掌握的有限信息，看起来 是这样的。如果 Speadsheet 实际上没有在代码中的其他任何地方定义，那么您可以这样写：

module Spreadsheet # Can be a class, and can instead be SpreadSheet - as long as you're consistent!!
  class Import
    # ...
  end
end

Answer 2

是的..你可以添加它自动加载，但另一种方法是通过 "require"

在 rake 文件中添加

这是另一种方式，

lib/spreadsheet/importer.rb

module Spreadsheet
    class Importer
      def initialize
        @session = GoogleDrive.saved_session("#{Rails.root}/config/google_drive/config.json")
      end

      def exec(table_name)
        #do something
      end
    end
end

lib/tasks/spreadsheet.rake

您需要使用 'reqire'

来包含文件

namespace :spreadsheet do
  task :get => :environment do
    require "#{Rails.root}/lib/spreadsheet/importer"  
    importer = Spreadsheet::Importer.new
    importer.exec
  end
end

快乐编码!!!!!

谢谢。

rake aborted! NameError: uninitialized constant even add :enviroment to task

rake aborted! NameError: uninitialized constant even add :enviroment to task

ruby

rake

rubygems

ruby-on-rails

google-spreadsheet-api