Ferrum Doesn’t Work on Heroku?

Yegor Chsherbakov — Tue, 29 Oct 2024 09:50:36 +0000

To work with Ferrum, you need a web driver. Locally, this is simple — a new Chrome window just opens up. But on Heroku, you’ll need to add a buildpack:

heroku buildpacks:add -i 1 heroku-community/chrome-for-testing

Don’t forget to set up Chrome in your CI:

steps:
  - name: Setup Chrome
    uses: browser-actions/setup-chrome@latest
    with:
      chrome-version: stable

Here’s where the problems start: maybe it’s just me, but when generating PDFs with Ferrum, I kept running into a process_timeout error. This error showed up after upgrading to the Heroku chrome-for-testing buildpack.

The fix — enable the no-sandbox option:

Ferrum::Browser.new(browser_options: { 'no-sandbox': nil })

Importmap Not Working on iOS

Yegor Chsherbakov — Tue, 22 Oct 2024 16:47:34 +0000

I recently encountered an issue where my JavaScript scripts stopped working on iPhones and iPads (tested on Safari, Chrome, and Firefox). The root cause turned out to be the removal of the es-module-shim module in importmaps-rails 2.0, which was responsible for ES module support in older browsers.

Removing this module breaks the scripts on iOS devices.

Simple solution: To restore JavaScript functionality, add the following script to your application file:

<script async src="https://unpkg.com/es-module-shims"></script>

You can read more about the removal of the module in the article: world.hey.com/importmaps-rails 2.0 dropped es-module-shim.

DEV Community: Yegor Chsherbakov

Ferrum Doesn’t Work on Heroku?

Importmap Not Working on iOS