Why can't Heroku find my autoload.php file?

Question

I'm setting up a demo site for a Wordpress plugin on Heroku. My plugin uses composer to manage dependencies, and it's configured as a git submodule on my local installation. I push to heroku and everything seems to work. I use heroku run bash to ssh into the app and manually run composer install from inside my plugin. Then I log into the site and try to activate my plugin... but I get the following error:

Plugin could not be activated because it triggered a fatal error.

Warning: require_once(/app/wp-content/plugins/wp-github-pipeline/vendor/autoload.php): failed to open stream: No such file or directory in /app/wp-content/plugins/wp-github-pipeline/wp-github-pipeline.php on line 23 Fatal error: require_once(): Failed opening required '/app/wp-content/plugins/wp-github-pipeline/vendor/autoload.php' (include_path='.:/app/.heroku/php/lib/php') in /app/wp-content/plugins/wp-github-pipeline/wp-github-pipeline.php on line 23

I don't get it. With heroku run bash I can see that the file is actually there. And I don't get this issue locally or on another remote server. Why is it happening here?

Answer 1

I can't say for sure why this worked but it appears that Heroku doesn't really play nicely with composer.json somewhere other than the project root. So I took my project's composer.json and moved it to the project root, then I added...

"config": {
    "vendor-dir": "wp-content/plugins/wp-github-pipeline/vendor"
}

...which caused the dependancies I needed (and the autoload.php) to get installed in the original location.

With this, I am able to push to Heroku normally without issues.

I have NO idea why I was able to run composer install manually without it working. I also have NO idea why heroku run bash would show me files that aren't actually there.

Answer 2

According to me you have to regenerate the autoload. Hope that you have written code within composer.json for autoloads.

composer dump-autoload

This will regenerate your autoload and it will solve your problem. If not please modify your question by pasting your composer.json.

Answer 3

What I did to solve this was add an include_path to my .user.ini file. That ini file needs to be located in the document root , not the app's root.

include_path = ".:/app/.heroku/php/lib/php:/app/vendor/"

Don't copy my include_path example verbatim, as it might now be the needed include path for your app. Get your current include path from Heroku's error log, and then append :/app/vendor to it.

What's important there is adding /app/vendor/ to the include_path. That will point your require php statement to the spot where Heroku puts the autoload.php .