How do I run all rake tasks?

问题:

Have just installed whenever gem https://github.com/javan/whenever to run my rake tasks, which are nokogiri / feedzilla dependent scraping tasks.

eg my tasks are called grab_bbc, grab_guardian etc

My question - as I update my site, I keep add more tasks to scheduler.rake.

What should I write in my config/schedule.rb to make all rake tasks run, no matter what they are called?

Would something like this work?

    every 12.hours do
        rake:task.each do |task|
            runner task
        end 
    end

Am new to Cron, using RoR 4.

回答1:

namespace :sc do
  desc 'All'
  task all: [:create_categories, :create_subcategories]

  desc 'Create categories'
  task create_categories: :environment do
    # your code
  end

  desc 'Create subcategories'
  task create_subcategories: :environment do
    # your code
  end
end

in console write $ rake sc:all

回答2:

write separate rake tasks for each scraping tasks. then write a aggregated task to run all those scraping rake tasks.

desc "scrape nytimes"
task :scrape_nytimes do
  # scraping method
end

desc "scrape guardian"
task :scrape_guardian do
  # scraping method
end

desc "perform all scraping"
task :scrape do
  Rake::Task[:scrape_nytimes].execute 
  Rake::Task[:scrape_guardian].execute 
end

then call the rake task as

rake scrape

回答3:

Make sure you have a unique namespace with all the tasks in it, like:

namespace :scrapers do

  desc "Scraper Number 1" 
  task :scrape_me do
    # Your code here
  end

  desc "Scraper Number 2"
  task :scrape_it do
    # Your code here
  end

end

You could then run all tasks of that namespace with a task outside of that namespace:

task :run_all_scrapers do
  Rake.application.tasks.each do |task|
    task.invoke if task.name.starts_with?("scrapers:")
  end
end

That said, I'm pretty sure that this is not how you should run a set of scrapers. If for any reason the if part should return true you might unintenionally run tasks like rake db:drop

Either "manually" maintaining schedule.rb or a master task seems like a better option to me.

回答4:

The aggregated task can be concise:

namespace :scrape do
  desc "scrape nytimes"
  task :nytimes do
    # scraping method
  end

  desc "scrape guardian"
  task :guardian do
    # scraping method
  end
end

desc "perform all scraping"
task scrape: ['scrape:nytimes', 'scrape:guardian']

Namespaces are also a good practice.