Previous posts
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Find Test Output Saved by Drupal CI’s Jenkins Server
How to find the HTML file output saved during testing on Drupal CI’s Jenkins server.
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Drupal’s Menu Link Migration Mess
Why some menu links cannot be migrated with Drupal core migrations.
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The Magical Migration Lookup Plugin
The migration lookup plugin that creates migration stubs only for existing source IDs and is able to identify which migration should create the stub.
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Lessons Learned with Bean Migrate
Some words about the problems I ran into while developing the module.
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Issues with core multilingual migrations
The bugs I ran into while vetting Drupal core’s multilingual migrations.
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Lessons I Learned While Developing Location Migration
Mistakes I made and which you can avoid now.
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Mistakes We Make in Drupal to Drupal Migration Projects
Migrating Drupal 7 → Drupal 8+ is very resource intensive and takes a lot of time… But is this statement really true?
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Composer Trick for Contrib Modules That Are Incompatible with Drupal 9
How to replace the info coming from a Drupal contrib module’s
composer.jsonto make it installable in your Drupal 9 Composer project. - 
                
Tasks to solve before upgrading to Drupal 9.0.0-alpha2
The most important thing:
TrustedCallbackInterface. - 
                
How I upgraded to Drupal 9.0.0-alpha1
Typical issues I ran into and how I solved them temporarily.