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This article is work in progress to help Drupal developers finding out, why a page is not cached in many situations. It can help as a checklist.I'll add further information in the future, possibly. Typical reasons for pages not being cached

Altering a Layout Paragraphs paragraph create / edit form sounds easy and it indeed is, but you have to know, which hook to use.To make it easier for you, here's how:Use hook_form_layout_paragraphs_component_form_alter() which can be found

When working with entity types, view-modes, fields and configuration in modules, you'll surely run into the situation that you have to add new configuration (from the config/install directory) .yml's into the active configuration in update

Are you seeing the error message "Could not retrieve the oEmbed resource" in you Drupal Media library and don't know what that means and how to fix it?It was the same for me. So I had a look into the code.TL;DR:At least one of your oEmbed

Just a little snippet today! Should you run into the situation that a Drupal 7 CMS Website is broken and you can't see errors, perhaps you're not able to log into the webserver administration panel, then the following snippet for your

Running into issues likeAttempt to create a field storage [...] with no typewhen migrating from Drupal 6 or Drupal 7 to Drupal 8+?Then you're propably missing a migration for a custom field type used in your project. If it's your job to

In the COOKiES Drupal 8+ module, we had the issue that config entity string translations were not possible with text > 128 characters length: https://www.drupal.org/project/cookies/issues/3327045The reason for that is in core. Form API

Sometimes MR's and their issue forks become outdated and you need to reset them to the latest commit of the origin branch.But take care, that will discard all changes on this issue forks branch!Ok, you're sure?Here you go:git reset --hard

You're running Mink / Webdriver tests (or Drupal 8+) Tests and need to assert expected JavaScript errors?Sounds like an easy task, but doesn't seem very well-supported yet.After playing around a bit, this pattern is what worked best:<?php

This is just a hint for people migrating a Drupal 6 project to Drupal 8+ running into the issue of not migrating file / image fields values. It was quite hard to find the reason for that issue, so here's your answer.You're probably using -