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when cmd时，出现以下错误：

 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：我看过以下stackoverflow查询： How to detect Rails environment inside whenever

遵循此线程获取动态值，但遇到require语句的问题。 Rails - Whenever gem - Dynamic values

Ruby/Rails - Whenever gem - Loop cron tasks

config file in schedule.rb with Rails Whenever gem?

Answer 1

当根本不需要或依赖Rails时，所以当它运行时，RAILS_ROOT没有被定义，但是因为每当schedule.rb通常保存在/config/schedule.rb中时，我们可以假设它是在rails项目中，设置我们自己的RAILS_ROOT：

# 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

每当开发人员已回答此问题时，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。这应该是相同的：

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

Answer 3

在Rails 4中尝试：

require File.expand_path(File.dirname(__FILE__) + "/../config/environment")

在schedule.rb文件中

。这样，您还可以访问所有活动记录模型和初始化程序。

每当gem schedule.rb文件：不识别RAILS_ROOT变量

3 个答案: