Blog Archives

Migrating Into Existing Nodes in Drupal 8, Including Rollback Missing from Source

Please read this entire post (including the disclaimer at the bottom) before you put any of it to use. The site I’m basing this off had an existing set of nodes and a new migration that had the same nodes (and

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Modifying Rows During a Drupal 8 CSV Migration

Migrate Source CSV is currently the source plugin of choice for doing a CSV-to-Drupal migration with the Migrate API in Drupal 8. In this post I will demonstrate how to manipulate the CSV data in realtime during the migrate:import operation.

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Migrating Specific Fields in a D8 Migration

I recently needed a way to update the value of a single field of a D7 to D8 node migration. The client was already updating the migrated content so I had to be careful with what I migrated. The entity

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Migrating a Drupal 7 User Profile2 Image Field to a Drupal 8 User Image Field

Consider this scenario: Drupal 7 site contains Profile2 profile called person with image field called field_oldsite_person_image. Users each have a profile2 profile associated with their account. Drupal 8 site has an image field called field_newsite_user_photo on the user entity itself. If you need to

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Quick Tips for a Drupal 7 to Drupal 8 Migration

Here are a few quick tips for a Drupal 7 to Drupal 8 migration. I will add more over time; admittedly it’s pretty lame right now! For general Drupal 8 Migrate API tips, you may also want to check out

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Only Migrating Published Nodes in a D7 to D8 Migration

I’m not going into much detail here but hopefully this helps someone. If you need to migrate only published nodes you can extend the d7_node plugin and add a condition to the query. First, create a file in your module like /modules/custom/mysite_migrate/src/Plugin/migrate/source/MysiteNewsNode.php

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Using GROUP_CONCAT to Combine Rows in a Drupal Query

Recently I was working on a D7 to D8 migration. I was trying to import news items and their taxonomy terms (among many other things). To make things simple I wanted the query results to have (for each node) a

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Send email after Migrate Import in Drupal 8

Here’s an example of a barebones event subscriber to send an email when a Drupal migration finishes importing. The success vs failure logic isn’t working correctly, but you’ll get the gist. If you come up with a solution for this please

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Drupal 8 Migrate Process Plugin: migration_lookup_target_ids

I was having some difficulties using the migration_lookup process plugin. I wrote this plugin so that I could make sense of how the migration lookup was working and the data that it was returning. The plugin ended up being something

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Drupal 8 Migrate – Tips and Tricks

This is an ongoing brain dump of quick tips for working with Drupal 8 Migrate. These items may seem true to me as I’m writing them today, but I’m constantly being reminded that things aren’t always as they seem with Migrate.

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