Hi, it’s Greg. Let’s explore this week’s changes in the Rails codebase.

Fix word_wrap with empty string
This pull request fixes word_wrap to return an empty string instead of nil when given an empty string.

Process preview variant when processing preview
This pull request updates ActiveStorage::Preview#processed to generate both the full-sized preview image and the requested variant. For example, attached_pdf.preview(:thumb).processed will now immediately generate the full-sized preview image and the :thumb variant of it. Previously, the :thumb variant would not be generated until a further call to e.g. processed.url.

Fix TransformJob not accepting previewables
The ActiveStorage::TransformJob is being used when an attachment has predefined variants with the preprocessed option. When you upload a file which is not an image but a previewable file like a pdf-document it failed with ActiveStorage::InvariableError. This pull request fixes that by determining if a blob is capable of being previewed. If so, a preview will be generated.

Add Action Mailer bug report template
This pull request introduces Action Mailer bug report templates for contributors to reproduce issues with failing ActionMailer::TestCase instances.

Make return value of Cache::Store#write consistent

The return value of Cache::Store#write was not specified before, and varied between backends. This pull request makes it consistent:

• true indicates a successful write
• nil indicates an error talking to the cache backend
• false indicates a write that failed for another reason

This helps to distinguish the case where the key already exists from the case where there was a memcached (or Redis) error.

You can view the whole list of changes here.
We had 25 contributors to the Rails codebase this past week!

Until next time!

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