Скачать или смотреть How to Fix Your Rake Task for Sending Emails in Ruby on Rails

Struggling to send emails from a rake task in Ruby on Rails? This guide will help you troubleshoot and fix the issues. Learn how to ensure your emails are sent successfully.
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This video is based on the question https://stackoverflow.com/q/63737947/ asked by the user 'Ilovebathroomlights' ( https://stackoverflow.com/u/12968081/ ) and on the answer https://stackoverflow.com/a/63746544/ provided by the user 'Sergio Tulentsev' ( https://stackoverflow.com/u/125816/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Calling Class Method Within a Rake Task: Common Issues and Solutions

If you are working on a Ruby on Rails application and trying to automate email notifications for unfulfilled orders, you might run into some challenges when implementing a rake task. Many developers find themselves in a situation where a method works perfectly when called directly but fails to perform as expected when invoked from a rake task. In this guide, we will discuss a common issue related to this problem and walk through the solution in a clear, user-friendly manner.

The Problem

You have a rake task that is supposed to send emails with details about unfulfilled orders using a predefined method within your ApplicationMailer. While the method works flawlessly when called directly from the command line, it seems to do nothing when invoked through your rake task.
Here’s a brief summary of the situation:

You set up a rake task to send out emails nightly via Heroku Scheduler.

The rake task is detected successfully, but executing it results in no emails sent and no changes in the database.

Rake Task Code

Your rake task is defined as follows:

[[See Video to Reveal this Text or Code Snippet]]

ApplicationMailer Method Code

Here’s a simplified version of the method in ApplicationMailer that works properly when executed directly:

[[See Video to Reveal this Text or Code Snippet]]

Understanding the Issue

The key issue here is that while your method prepares the order data and sets up the email nicely, it doesn’t actually send the email. In Ruby on Rails, when working with Action Mailer, you need to ensure that the email delivery method is explicitly called.

The Solution: Call deliver_later or deliver_now

To address the problem, you simply need to modify your method call in the rake task. You have two options depending on when you’d like the email to be sent:

deliver_now: Sends the email immediately.

deliver_later: Sends the email asynchronously (requires Active Job setup).

Updated Rake Task Code

Update your rake task to invoke the email delivery like this:

[[See Video to Reveal this Text or Code Snippet]]

Important Note on Heroku Scheduler

You mentioned using Heroku Scheduler for scheduling your rake task. It is essential to ensure that the environment setup in your rake task is appropriate, and calling the deliver method is vital for successful email dispatch.

Conclusion

In summary, if you find your rake task not sending emails as expected, make sure you are calling the deliver method correctly! By incorporating deliver_now or deliver_later, you can fix the issue of emails not being sent, ensuring your notifications reach their intended recipients every time. This small change can make a significant difference in your application's functionality.

If you're new to rake tasks or Action Mailer, don't hesitate to refer back to the documentation or seek help when needed. Happy coding!