Drupal Migrate API skip_on_multiple Process Plugin

Here’s a Migrate API process plugin I wrote in Drupal 9 that skips a property or row when more than one value exists. My use case:

  1. My source data has locations; each location has multiple associated organizations
  2. My new Drupal site has locations; each location has a parent organization
  3. I want to only populate the field_parent_org field (an entity reference) if there is a single organization value in the source data for the location
  4. I’m using a custom module called “pdms_migrate”

I’ve stripped out all of the noise from the examples below… hopefully it’s enough to help you understand the example:


In this example, only “My Second Location” will reference a parent organization in Drupal.







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