Migrate

Use Playwright visual regression testing on a large sample of content to test a migration between two editorial solutions.

While working on migrations from Drupal 7 to 8 it could be necessary to convert tokens from formatted text fields + get an idea of how many of them are in the database for estimation, e.g. to see if it is possible to rely on Token Filter or if there are custom tokens/filters.

This article will explain how to use migration templates with a CSV that contains the Paragraphs data on several lines.

The migrate system is stable since Drupal 8.5.0, so this is a great time to review the migration tools provided by the community. This post does not cover migration from the UI, it focuses on partially customized migration that are runned with Drush. In most cases, you will probably want to review the content model a bit (you know, that content type or field machine name that does not actually reflect the truth since its creation, ...). The idea behind is to delegate the heavy lifting to Migrate Upgrade for migration template generation, then apply content model changes if needed.

Migrate API is awesome, and if you plan some custom migration, a few contributed modules does the heavy lifting for you. This article should be regarded as a list of steps to follow to achieve a simple migration from another SQL data source than Drupal. So we will not go in deep into the explanations of the Migrate theory, for this subject, refer to the documentation of the Migrate API. Also, we will finish with some debugging techniques and a first shot of a bash script for rerolling a migration from scratch in case of configuration change.

Things have evolved quickly, we have now a huge bunch of helpers since 8.2.x in core for Drupal to Drupal migration: Migrate, Migrate Drupal and Migrate Drupal UI.