每当gem schedule.rb文件:不会重新获得RAILS_ROOT变量

Question

在schedule.rb文件中,语句:

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当cmd时,收到以下错误:

 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语句从表单中获取动态值以安排作业.请帮忙解决这个问题？

注意:我已经看到了以下stackoverflow查询: 如何在内部检测Rails环境

遵循此线程获取动态值,但面临require语句的问题. Rails - 每当宝石 - 动态值

Ruby/Rails - 每当gem - 循环cron任务

schedule.rb中的配置文件与Rails每当gem？

谢谢,Sudhir CN

Answer 1

根本不需要或依赖Rails,因此当它运行时,RAILS_ROOT没有定义,但是因为每当schedule.rb通常保存在/config/schedule.rb中时,我们可以假设它在轨道中项目,并设置我们自己的RAILS_ROOT像这样:

# in schedule.rb
RAILS_ROOT = File.dirname(__FILE__) + '/..'

编辑:如果您确实需要加载Rails,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")

Answer 2

每当开发人员已经回答了这个问题,请查看https://github.com/javan/whenever/issues/81

Javan每当不再尝试加载Rails环境时.但是,无论何时执行,它都会自动将路径变量设置为目录.这应该是一样的:

set :output, "#{path}/log/cron.log"