{"id":37366,"date":"2023-07-11T05:33:25","date_gmt":"2023-07-11T05:33:25","guid":{"rendered":"https:\/\/www.railscarma.com\/?p=37366"},"modified":"2023-07-20T04:44:25","modified_gmt":"2023-07-20T04:44:25","slug":"background-jobs-and-task-scheduling-in-ruby-on-rails","status":"publish","type":"post","link":"https:\/\/www.railscarma.com\/fr\/blog\/background-jobs-and-task-scheduling-in-ruby-on-rails\/","title":{"rendered":"Travaux en arri\u00e8re-plan et planification des t\u00e2ches dans Ruby on Rails"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"37366\" class=\"elementor elementor-37366\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-7609814 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"7609814\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-c5f64c9\" data-id=\"c5f64c9\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-a89b66a elementor-widget elementor-widget-text-editor\" data-id=\"a89b66a\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">In modern web applications, it&#8217;s crucial to handle time-consuming tasks efficiently without affecting the user experience. Ruby on Rails provides robust solutions for executing background jobs and scheduling recurring tasks. In this article, we&#8217;ll explore how to leverage background jobs and task scheduling in Ruby on Rails to enhance application performance and maintain responsiveness.<\/span><\/p><h3><b>Understanding Background Jobs:<\/b><\/h3><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Overview of background jobs and their importance in web applications.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Introduction to popular background job processing frameworks like <a href=\"https:\/\/www.railscarma.com\/fr\/blog\/articles-techniques\/sidekiq-gem-emplois-darriere-plan-rails-2\/\">Sid\u00e9kiq<\/a>, Delayed Job, and <a href=\"https:\/\/www.railscarma.com\/fr\/blog\/articles-techniques\/resque-gem-pour-les-processus-darriere-plan-dans-ror\/\">Demander<\/a>.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Exploring the role of job queues and workers in executing background tasks.<\/span><\/li><\/ul><h3><b>Setting up Background Job Processing:<\/b><\/h3><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Installing and configuring a background job processing framework.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Defining background job classes and their associated tasks.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Integrating the chosen framework with your Rails application.<\/span><\/li><\/ul><h3><b>Performing Asynchronous Tasks:<\/b><\/h3><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Executing time-consuming operations asynchronously using background jobs.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Offloading tasks to background workers for improved responsiveness.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Handling job parameters and passing data between different job executions.<\/span><\/li><\/ul><h3><b>Job Prioritization and Queue Management:<\/b><\/h3><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Prioritizing and organizing jobs in different queues based on importance or resource requirements.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Configuring queue-specific settings and worker concurrency.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Monitoring and managing job queues to maintain optimal performance.<\/span><\/li><\/ul><h3><b>Retries, Error Handling, and Monitoring:<\/b><\/h3><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Implementing retry mechanisms for failed jobs to ensure task completion.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Handling exceptions and errors gracefully within background jobs.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Monitoring and logging job executions for debugging and performance analysis.<\/span><\/li><\/ul><h3><b>Task Scheduling:<\/b><\/h3><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Introduction to task scheduling and its applications in Rails.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Exploring scheduling options within Ruby on Rails, including cron-like syntax and recurrence rules.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Setting up and managing scheduled tasks using popular libraries like Whenever and Sidekiq Scheduler.<\/span><\/li><\/ul><h3><b>Advanced Background Job Techniques:<\/b><\/h3><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Chaining and sequencing background jobs for complex workflows.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Parallel processing and distributing tasks across multiple workers or servers.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Handling long-running tasks and preventing job timeouts.<\/span><\/li><\/ul><h3><b>Testing and Debugging Background Jobs:<\/b><\/h3><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Writing test cases for background job classes.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Simulating job executions and verifying expected outcomes.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Debugging common issues and troubleshooting job failures.<\/span><\/li><\/ul><h3><b>Let\u2019s Understand Background Jobs with an Example<\/b><\/h3><p><span style=\"font-weight: 400;\">Background jobs are tasks that are executed asynchronously outside the normal request-response cycle of a web application. They are typically used to handle time-consuming or resource-intensive operations without blocking the user interface. Background job processing frameworks like Sidekiq, Delayed Job, and Resque provide efficient mechanisms for executing these tasks.<\/span><\/p><p><span style=\"font-weight: 400;\">Example: Let&#8217;s consider an example where a user uploads a large CSV file to a Ruby on Rails application, and the application needs to process and import the data into the database. Since this operation can take a significant amount of time, we want to perform it asynchronously using a background job.<\/span><\/p><ol><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Setting up Background Job Processing: First, we need to set up a background job processing framework like Sidekiq. We install the Sidekiq gem and configure it in our Rails application. This involves specifying the connection details for the job processing backend (such as Redis) and defining the number of worker processes.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Creating a Background Job: Next, we create a background job class, let&#8217;s call it <\/span><b>\u2018CsvImportJob&#8217;<\/b><span style=\"font-weight: 400;\">, which will be responsible for processing the uploaded CSV file. We define this class inside the<\/span><b> \u2018app\/jobs\u2019<\/b><span style=\"font-weight: 400;\"> directory. The job class inherits from the base job class provided by the background job processing framework.<\/span><\/li><\/ol><p><strong>#app\/jobs\/csv_import_job.rb<br \/><\/strong><strong>class CsvImportJob &lt; ApplicationJob<br \/><\/strong><strong>queue_as\u00a0:\u00a0par d\u00e9faut<br \/><\/strong><strong>def perform(csv_file)<br \/><\/strong><strong># Process the CSV file and import the data into the database<br \/><\/strong><strong># Code for CSV processing and data import goes here<br \/><\/strong><strong>fin<br \/><\/strong><strong>fin<\/strong><\/p><p><b>Enqueuing the Background Job:<\/b><span style=\"font-weight: 400;\"> When the user uploads the CSV file, we enqueue the <\/span><b>\u2018<\/b><b>CsvImportJob\u2019<\/b><span style=\"font-weight: 400;\"> in the background job processing queue. This can be done in the controller action that handles the file upload.<\/span><\/p><p><strong>#app\/controllers\/csv_files_controller.rb<br \/><\/strong><strong>class CsvFilesController &lt; ApplicationController<br \/><\/strong><strong>cr\u00e9er par d\u00e9faut<br \/><\/strong><strong># File upload handling code<br \/><\/strong><strong>csv_file = params[:csv_file]<\/strong><\/p><p><strong># Enqueue the CsvImportJob with the uploaded file as a parameter<br \/><\/strong><strong>CsvImportJob.perform_later(csv_file)<br \/><\/strong><strong>redirect_to root_path, notice: &#8220;CSV file is being processed. You will be notified upon completion.&#8221;<br \/><\/strong><strong>fin<br \/><\/strong><strong>fin<\/strong><\/p><p><b>Executing the Background Job:<\/b><span style=\"font-weight: 400;\"> The background job processing framework (e.g., Sidekiq) picks up the enqueued job from the queue and executes it asynchronously. The <\/span><b>\u2018perform\u2019 <\/b><span style=\"font-weight: 400;\">method in the <\/span><b>\u2018CsvImportJob\u2019<\/b><span style=\"font-weight: 400;\"> class is invoked, and the CSV file is processed in the background.<\/span><\/p><p><strong>class CsvImportJob &lt; ApplicationJob<br \/><\/strong><strong># &#8230;<\/strong><\/p><p><strong>def perform(csv_file)<br \/><\/strong><strong># Process the CSV file and import the data into the database<br \/><\/strong><strong>CSV.foreach(csv_file.path, headers: true) do |row|<br \/><\/strong><strong># Data processing and database insertion logic goes here<br \/><\/strong><strong>fin<br \/><\/strong><strong>fin<br \/><\/strong><strong>fin<\/strong><\/p><p><span style=\"font-weight: 400;\">With this setup, the user can upload the CSV file, and the <\/span><b>\u2018CsvImportJob\u2019 <\/b><span style=\"font-weight: 400;\">will be executed in the background without blocking the user interface. The user receives immediate feedback that the file is being processed, and they can continue using the application.<\/span><\/p><h3><b>Let\u2019s Understand Task scheduling with an Example<\/b><\/h3><p><span style=\"font-weight: 400;\">Task scheduling in Ruby on Rails allows you to automate the execution of specific tasks or jobs at predetermined intervals or according to a defined schedule. In Rails, you can accomplish task scheduling using libraries like Whenever and Sidekiq Scheduler. Let&#8217;s explore an example of task scheduling in Ruby on Rails:<\/span><\/p><p><span style=\"font-weight: 400;\">Example: Sending Daily Email Reminders<\/span><\/p><h3><b>Setting up Task Scheduling:<\/b><\/h3><ul><li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">Install the Sidekiq Scheduler gem by adding it to your Gemfile and running <\/span><span style=\"font-weight: 400;\">installation group\u00e9e<\/span><span style=\"font-weight: 400;\">.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">Configure Sidekiq Scheduler in your Rails application by specifying the connection details for the job processing backend (e.g., Redis).<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Defining the Task:<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Create a new Ruby class to represent the task you want to schedule, e.g., <\/span><span style=\"font-weight: 400;\">ReminderTask<\/span><span style=\"font-weight: 400;\">. Place this class inside the <\/span><span style=\"font-weight: 400;\">app\/tasks<\/span><span style=\"font-weight: 400;\"> annuaire.<\/span><ul><li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">Implement the logic for sending daily email reminders within the <\/span><span style=\"font-weight: 400;\">perform<\/span><span style=\"font-weight: 400;\"> method of the <\/span><span style=\"font-weight: 400;\">ReminderTask<\/span><span style=\"font-weight: 400;\"> class.<\/span><\/li><\/ul><\/li><\/ul><p><strong>#app\/tasks\/reminder_task.rb<br \/><\/strong><strong>class ReminderTask<br \/><\/strong><strong>def perform<br \/><\/strong><strong># Query the database for users with pending tasks<br \/><\/strong><strong>users_with_pending_tasks = User.joins(:tasks).where(tasks: { status: &#8216;pending&#8217; }).distinct<\/strong><\/p><p><strong># Iterate over the users and send them a reminder email<br \/><\/strong><strong>users_with_pending_tasks.each do |user|<br \/><\/strong><strong>UserMailer.send_reminder_email(user).deliver_now<br \/><\/strong><strong>fin<br \/><\/strong><strong>fin<br \/><\/strong><strong>fin<\/strong><\/p><p><strong>Configuring Task Scheduling:<\/strong><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">Open the <\/span><span style=\"font-weight: 400;\">config\/schedule.rb<\/span><span style=\"font-weight: 400;\"> file in your Rails application.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">Use the Sidekiq Scheduler DSL (Domain-Specific Language) to define the schedule for executing the <\/span><span style=\"font-weight: 400;\">ReminderTask<\/span><span style=\"font-weight: 400;\">.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">Specify the schedule interval (e.g., daily) and the task to be executed.<\/span><\/li><\/ul><p><b># config\/schedule.rb<br \/><\/b><b>every <\/b><b>1<\/b><b>.day, <\/b><b>at:<\/b> <b>&#8217;10:00 am&#8217;<\/b> <b>faire<br \/><\/b><b>runner <\/b><b>&#8216;ReminderTask.perform&#8217;<br \/><\/b><b>fin<\/b><\/p><p><span style=\"font-weight: 400;\">In this example, the ReminderTask is scheduled to execute every day at 10:00 am using the every method provided by Sidekiq Scheduler. The runner method is used to invoke the perform method of the ReminderTask class.<\/span><\/p><p><strong>Updating the Cron Job:<\/strong><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">After configuring the task schedule, you need to update the cron job by running the following command:<\/span><\/li><\/ul><p><strong>$ bundle exec whenever &#8211;update-crontab<\/strong><\/p><p><span style=\"font-weight: 400;\">This command updates the system&#8217;s cron job configuration to include the defined schedule.<\/span><\/p><p><strong>Verifying Task Execution:<\/strong><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">To ensure that the task is executed as expected, you can test it manually or wait until the scheduled time and check if the email reminders are sent to users with pending tasks.<\/span><\/li><\/ul><p><span style=\"font-weight: 400;\">With the task scheduling set up, the <\/span><b>\u2018ReminderTask\u2019<\/b><span style=\"font-weight: 400;\"> will be automatically executed according to the defined schedule, sending email reminders to users with pending tasks at the specified time (10:00 am in this example).<\/span><\/p><p><span style=\"font-weight: 400;\">Task scheduling allows you to automate repetitive tasks and streamline the operations of your Ruby on Rails application. By leveraging the capabilities of task scheduling libraries, you can ensure timely execution of important jobs and improve overall efficiency.<\/span><\/p><h3><b>Conclusion:<\/b><\/h3><p><span style=\"font-weight: 400;\">Background jobs and task scheduling are integral components of Ruby on Rails applications that enhance efficiency and maintain responsiveness. By leveraging the power of background job processing frameworks and implementing effective task scheduling strategies, developers can optimize performance and provide a smooth user experience. Understanding the concepts and best practices outlined in this article will empower developers to handle time-consuming operations effectively and unlock the full potential of<a href=\"https:\/\/www.railscarma.com\/fr\/developpement-dapplications-de-rails-personnalises\/\"> Applications Ruby on Rails<\/a>. <a href=\"https:\/\/www.railscarma.com\/fr\">Railscarma<\/a> is a prominent software development company specializing in Ruby on Rails, known for their expertise in building robust web applications, APIs, e-commerce solutions, and custom software, offering reliable and efficient Rails development services to clients across various industries. <a href=\"https:\/\/www.railscarma.com\/fr\/contactez-nous\/\">Contact us now!<\/a><\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t  <div class=\"related-post slider\">\r\n        <div class=\"headline\">Articles Similaires<\/div>\r\n    <div 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Ruby on Rails provides robust solutions for executing background jobs and scheduling recurring tasks. In this article, we&#8217;ll explore how to leverage background jobs and task scheduling in Ruby on Rails to enhance application performance and maintain responsiveness. Understanding &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/www.railscarma.com\/fr\/blog\/ruby-regex-match-guide-with-examples\/\"> <span class=\"screen-reader-text\">Guide de correspondance des expressions rationnelles en Ruby (2026) avec exemples<\/span> Lire la suite \u00bb<\/a><\/p>","protected":false},"author":5,"featured_media":37374,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1224],"tags":[],"class_list":["post-37366","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Background Jobs and Task Scheduling in Ruby on Rails - RailsCarma<\/title>\n<meta name=\"description\" content=\"Feature flags in Rails offer a powerful technique for selectively enabling or disabling certain features within an app without any code.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.railscarma.com\/fr\/blog\/background-jobs-and-task-scheduling-in-ruby-on-rails\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Background Jobs and Task Scheduling in Ruby on Rails - RailsCarma\" \/>\n<meta property=\"og:description\" content=\"Feature flags in Rails offer a powerful technique for selectively enabling or disabling certain features within an app without any code.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.railscarma.com\/fr\/blog\/background-jobs-and-task-scheduling-in-ruby-on-rails\/\" \/>\n<meta property=\"og:site_name\" content=\"RailsCarma - Ruby on Rails Development Company specializing in Offshore Development\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/RailsCarma\/\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-11T05:33:25+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-07-20T04:44:25+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.railscarma.com\/wp-content\/uploads\/2023\/07\/Background-Jobs-and-Task-Scheduling-in-Ruby-on-Rails.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"800\" \/>\n\t<meta property=\"og:image:height\" content=\"300\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Nikhil\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@railscarma\" \/>\n<meta name=\"twitter:site\" content=\"@railscarma\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Nikhil\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.railscarma.com\/blog\/background-jobs-and-task-scheduling-in-ruby-on-rails\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.railscarma.com\/blog\/background-jobs-and-task-scheduling-in-ruby-on-rails\/\"},\"author\":{\"name\":\"Nikhil\",\"@id\":\"https:\/\/www.railscarma.com\/#\/schema\/person\/1aa0357392b349082303e8222c35c30c\"},\"headline\":\"Background Jobs and Task Scheduling in Ruby on Rails\",\"datePublished\":\"2023-07-11T05:33:25+00:00\",\"dateModified\":\"2023-07-20T04:44:25+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.railscarma.com\/blog\/background-jobs-and-task-scheduling-in-ruby-on-rails\/\"},\"wordCount\":1333,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.railscarma.com\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.railscarma.com\/blog\/background-jobs-and-task-scheduling-in-ruby-on-rails\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.railscarma.com\/wp-content\/uploads\/2023\/07\/Background-Jobs-and-Task-Scheduling-in-Ruby-on-Rails.jpg\",\"articleSection\":[\"Blogs\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.railscarma.com\/blog\/background-jobs-and-task-scheduling-in-ruby-on-rails\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.railscarma.com\/blog\/background-jobs-and-task-scheduling-in-ruby-on-rails\/\",\"url\":\"https:\/\/www.railscarma.com\/blog\/background-jobs-and-task-scheduling-in-ruby-on-rails\/\",\"name\":\"Background Jobs and Task Scheduling in Ruby on Rails - 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