Question

我在ubuntu 12.04上运行rails。当我运行下面的代码时，我从我的一个自定义任务中得到一个错误。问题是我不希望我的自定义任务首先运行。只是db迁移。

rake db:migrate --trace

rake aborted!
cannot load such file -- CSV
/home/js/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.6/lib/active_support/dependencies.rb:251:in `require'
/home/js/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.6/lib/active_support/dependencies.rb:251:in `block in require'
/home/js/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.6/lib/active_support/dependencies.rb:236:in `load_dependency'
/home/js/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.6/lib/active_support/dependencies.rb:251:in `require'
/var/www/myapp/lib/tasks/import_inventory.rake:1:in `<top (required)>'
/home/js/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.6/lib/active_support/dependencies.rb:245:in `load'
/home/js/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.6/lib/active_support/dependencies.rb:245:in `block in load'
/home/js/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.6/lib/active_support/dependencies.rb:236:in `load_dependency'
/home/js/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.6/lib/active_support/dependencies.rb:245:in `load'
/home/js/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.6/lib/rails/engine.rb:425:in `block in load_tasks'
/home/js/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.6/lib/rails/engine.rb:425:in `each'
/home/js/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.6/lib/rails/engine.rb:425:in `load_tasks'
/home/js/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.6/lib/rails/application.rb:145:in `load_tasks'
/home/js/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.6/lib/rails/railtie/configurable.rb:30:in `method_missing'
/var/www/myapp/Rakefile:7:in `<top (required)>'
/home/js/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/rake_module.rb:25:in `load'
/home/js/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/rake_module.rb:25:in `load_rakefile'
/home/js/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/application.rb:501:in `raw_load_rakefile'
/home/js/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/application.rb:82:in `block in load_rakefile'
/home/js/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
/home/js/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/application.rb:81:in `load_rakefile'
/home/js/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/application.rb:65:in `block in run'
/home/js/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
/home/js/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/application.rb:63:in `run'
/home/js/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/bin/rake:33:in `<top (required)>'
/home/js/.rvm/gems/ruby-1.9.3-p194@global/bin/rake:19:in `load'
/home/js/.rvm/gems/ruby-1.9.3-p194@global/bin/rake:19:in `<main>'
/home/js/.rvm/gems/ruby-1.9.3-p194/bin/ruby_noexec_wrapper:14:in `eval'
/home/js/.rvm/gems/ruby-1.9.3-p194/bin/ruby_noexec_wrapper:14:in `<main>'

正在运行Rake任务：

require 'CSV'

namespace :db do
  desc 'Prepare transition database.'
  task :import_inventory => :environment do
    desc 'Import Assets Table'

    file_path = "/Users/js/data/TSI/inventory.csv"

    CSV.foreach(file_path, :headers => true) do |row|
      asset = Asset.new
      asset.asid_tag = row[0]
      asset.description = row[1]
      asset.qty = row[2]
      asset.manufactuer = row[3]
      asset.model = row[4]
      asset.save
    end
   end
end

Answer 1

当您运行Rake时，所有任务文件（lib / tasks / * .rb）都会被加载并解析，然后rake才能确定可用的任务。这意味着，无论是否调用导入任务，在运行您请求的实际任务（db：migrate）之前，ruby都会解析文件import_inventory.rake。结果require 'CSV'被执行，无论您真正尝试运行什么任务。

至于修复，我猜它应该是require 'csv'（小写）而不是require 'CSV'（大写）？

当我运行'rake db：migrate'时，自定义rake任务正在运行。我该如何防止这种情况？

1 个答案: