I have a directory called cron, inside my app directory. In the cron directory, I have put my cron file. How do I access the model inside my cron file?
Which is the best place to put my cron file?
edit:
I'm trying to execute the cron file, directly like ruby cron.rb
I'm assuming what you want to do is run a script (which you have saved in the cron folder) as a cronjob, but you want it to load the Rails environment, including access to your ActiveRecord models, before it runs.
If this is the case, what you want to use is the script/runner script in your Rails app, supplying it with the name of the script you want to run, e.g.
script/runner cron/my_cron_script.rb
If you want to add this as a cronjob, add it to your crontab as follows. Edit your crontab with the crontab -e command and put something like the following there:
* * * * * /path/to/my/app/script/runner /path/to/my/app/cron/my_cron_script.rb
Related
I have a ruby script that is running every 24 hours via cron. It just does some scraping of a site and saves the data to a CSV file. Instead, I want to write it directly to a rails db so I can use it from within my rails app.
I have tried calling the class such as Class.new but this does not work. How can I write this directly into a rails db?
You can run class methods in your Rails app from Cron like this:
0 0 * * * cd path/to/your/app; RAILS_ENV=production script/runner "Scapper.process"
I have a Rails runner task that I want to run from cron, but of course cron runs as root and so the environment is set up improperly to get RVM to work properly. I've tried a number of things and none have worked thus far. The crontab entry is:
* 0 * * * root cd /home/deploy/rails_apps/supercharger/current/ && /usr/local/rvm/wrappers/ruby-1.9.3-p484/ruby bundle exec rails runner -e production "Charger.start"
Apologies for the super long command line. Anyhow, the error I'm getting from this is:
ruby: No such file or directory -- bundle (LoadError)
So ruby is being found in the RVM directory, but again, the environment is wrong.
I tried rvm alias delete [alias_name] and it seemed to do something, but darn if I know where the wrapper it generated went. I looked in /usr/local/rvm/wrappers and didn't see one with the name I had specified.
This seems like a common problem -- common enough that the whenever gem exists. The runner command I'm using is so simple, it seemed like a slam dunk to just put this entry in the crontab and go, but not so much...
Any help with this is appreciated.
It sounds like you could use a third-party tool to tether your Rails app to cron: Whenever. You already know about it, but it seems you never tried it. This gem includes a simple DSL that could be applied in your case like:
every :day # Or specify another period, or something else, see README
runner "Charger.start"
end
Once you've defined your schedule, you'll need to write it into crontab with whenever command line utility. See README file and whenever --help for details.
It should not cause any performance impact at runtime since all it does is conversion into crontab format upon deployment or explicit command. It's not needed, once the server is running, everything is done by cron after that.
If you don't want an extra gem anyway, you might as well check what command does it issue for executing your task. Still, an automated way of adding a cron task is easier to maintain and to deploy. Sure, just tossing a line into the crontab is easier — just for you and just this once. Then it starts to get repetitive and tiring, not to mention confusion for other potential developers who will have to set up something similar on their own machines.
You can run cron as different user than root. Even in your example the task begins with
* 0 * * * root cd
root is the user that runs the command. You can edit it with crontab -e -u username.
If you insist on running cron task as root or running as other user does not work for some reason, you can switch user with su. For example:
su - username -c "bundle exec rails runner -e production "Charger.start"
i deployed (with capistrano) a ruby on rails project on an aws micro server.
I'm on ruby 1.9.2-290 and rails 3.2.6 and i also use bundler.
I developed a task rake in my opt/rails-project/lib/tasks/tasks.rake
namespace :myclass do
task "my-task" => :environment do
# do the stuff which work nicely if i enter my command line manually
end
end
This is how i call it in my crontab :
*/3 * * * * cd /opt/rails-project/current && /opt/rails-project/shared/bundle/ruby/1.9.1/gems/rake-0.9.2.2/bin/rake myclass:my-task RAILS_ENV=production >> ~/logs-my-task.txt
The file ~/logs-my-task.txt is created and updated every 3min as it does. This file only contains info of the version release from capistrano but nothing from my task rake.
As i said in my comment in my task rake, if i launch this command directly in the server via ssh, my task rake does its job...
I searched the web all day/night long and can not figure it out.
I tried to remove the http_basic auth from rails but same problem.
Hope you have a idea,
Thanks for help !
Try to put this part
cd /opt/rails-project/current && /opt/rails-project/shared/bundle/ruby/1.9.1/gems/rake-0.9.2.2/bin/rake myclass:my-task RAILS_ENV=production >> ~/logs-my-task.txt
inside some file, somescript.sh, give execution permissions:
chmod +x somescript.sh
and try to run it manually:
/path/to/somescript.sh
If it works, try to put it into crontab:
*/3 * * * * /path/to/somescript.sh
It often helps to put complex stuff inside script to run in from crontab.
Next step, ensure that you PATH environment variable the same for your shell and for cron. You can set it inside crontab or inside your script.
After I used a shell script as recommended by denis.peplin and launched it manually, I got the problem described here: Ruby on Rails and Rake problems: uninitialized constant Rake::DSL.
I included the following line in my Rakefile and let my crontab as it was before:
require 'rake/dsl_definition'
I'm trying to create a script to mess around with the db entries in my rails application, but I don't know how to properly set it up to gain access to all my models etc.
I can do this easily with scripts like seeds.rb using 'rake db:seed' to execute or in my application controllers, but I want to create scripts outside of these that I can run in the background or just once.
Do I need to include something, or call the script with a certain rails command? And as a second related question, is there any way for me to execute rails commands like 'rake db:seed' from within a ruby script? The only method I know of right now that works is running 'rails console' and executing commands there.
require 'config/environment.rb'
When the script is in your rails root...
I got some cron jobs that i wanna test, where should i out them, how can i run them with rails commands and if the got some dependencies like files and stuff how can i load their fixture?
to be more concrete lets say i got a rb file thats reads a file from a the app folder, do some parsing, and writes stuff to db.
where to put the test and how to connect it with rails?
My method is to create a folder called app/jobs, then name the classes in the folder accordingly. The jobs are then called using script/rails runner. The runner interface loads rails and you have access to all of your models.
class SomeOddJob
def run
#do something
end
end
from your cron job you'd run the job like this (in production mode):
0 5 * * * /path/to/script/rails runner -e production "SomeOddJob.run"