大佬教程收集整理的这篇文章主要介绍了ruby-on-rails – 每当gem schedule.rb文件：不重写RAILS_ROOT变量，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。
require "#{RAILS_ROOT}/config/environment.rb" every "10 10 2 * * *" do command "mysqldump -u #{@db_usernamE} -p#{@db_password} --single-transaction #{@db_name} > #{@BACkup_Path}/#{@db_name}.sql 2> log/error_crontab.log" end
当我尝试从终端执行每个cmd时,得到以下错误：
config/schedule.rb:48:in `initialize': uninitialized constant Whenever::JobList::rAILS_ROOT (NameError) from /usr/local/lib/ruby/gems/1.9.1/gems/whenever-0.7.0/lib/whenever/job_list.rb:19:in `instance_eval' from /usr/local/lib/ruby/gems/1.9.1/gems/whenever-0.7.0/lib/whenever/job_list.rb:19:in `initialize' from /usr/local/lib/ruby/gems/1.9.1/gems/whenever-0.7.0/lib/whenever.rb:16:in `new' from /usr/local/lib/ruby/gems/1.9.1/gems/whenever-0.7.0/lib/whenever.rb:16:in `cron' from /usr/local/lib/ruby/gems/1.9.1/gems/whenever-0.7.0/lib/whenever/command_line.rb:40:in `run' from /usr/local/lib/ruby/gems/1.9.1/gems/whenever-0.7.0/lib/whenever/command_line.rb:7:in `execute' from /usr/local/lib/ruby/gems/1.9.1/gems/whenever-0.7.0/bin/whenever:38:in `<top (required)>' from /usr/local/bin/whenever:19:in `load' from /usr/local/bin/whenever:19:in `<main>'
我正在使用Require语句从窗体获取动态值来计划作业.请帮忙解决这个问题？
注意：我已经看到以下stackoverflow查询：
How to detect Rails environment inside whenever
以下这个线程得到动态值,但面临的问题与require语句.
Rails – Whenever gem – Dynamic values
Ruby/Rails – Whenever gem – Loop cron tasks
config file in schedule.rb with Rails Whenever gem?
谢谢,
Sudhir C.N.
# in schedule.rb RAILS_ROOT = File.dirname(__FILE__) + '/..'
编辑：在您实际需要加载Rails的情况下,请执行以下操作：
# in schedule.rb # this will require config/environment and load your entire rails environment require File.expand_path(File.dirname(__FILE__) + "/environment")
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