RAILS 6：如何在 crontab 中运行 rails 任务？

Question

I wuould like to run rails tasks started by cron (crontab entry). But I get always the error that the rails command could not be found.

/bin/sh: rails: No such file or directory

So what I tried is the same as the .profile or .bashrs contains :

source "$HOME/.rvm/scripts/rvm"
export PATH="$PATH:$HOME/.rvm/bin"

It dont know which variables need to be exported, or which programm/tools/sub-command need to be execuuted before, in which order, first execute command XYZ then export GEM___ variable 1 2 3, then execute another sub-command, then check by command ABC but not when tool rvm list returns string not equal RVM_string_1 ....

Answer 1

Hi you can use whenever gem for this. Please follow these bellow steps:

Step 1: Add whenever gem into your Gemfile

# Gemfile

gem 'whenever', '~> 1.0'

Step 2: Run bundle install to install this gem.

Step 3: Run wheneverize . This will create an initial config/schedule.rb file for you (as long as the config folder is already present in your project).

Step 4: Open newly created config/schedule.rb and write your scheduler task.

# config/schedule.rb
# here `fetch_user_meetings:sync` this is one task in my case.
# please replace this with your task.

every :hour do
  rake "fetch_user_meetings:sync", output: {
    error: 'log/fetch_user_meetings_sync_error.log',
    standard: 'log/fetch_user_meetings_sync_access.log'
  }
end

Step 5: Run whenever . This command will output a preview of the generated schedules in the actual cron format and attach your job with crontab. Whenever you are modifying your config/scheduler.rb , run this command. This will update your cron job.

NB: There are many options to set your scheduler job. Please follow this doc .

Happy Coding :-)