Problem/Motivation

The migration process plugin provides lookup of entities managed by a designated migration, with the optional stubbing fallback to create a minimum viable entry in the destination that can be revisited with a second pass when the source data is migrated at a later time.

If you disable stubbing, the migration process plugin returns NULL which prevents meaningfully chaining follow-up actions to handle the value. If you enable stubbing, you have no ability to programmatically affect how the stubbing happens. The Source plugin associated with the migration does not even have a chance to run prepareRow().

Proposed resolution

Wrap the line that generates the row in a separate method on the migration process plugin so customizations of this plugin can manipulate stubbing without needing to duplicate code, duplicate execution, or "trick" the migration process plugin by configuring the custom, extending plugin with no_stub so the customization in the plugin can handle the stubbing anyway, making for a confusing configuration.

$stub_row = new Row($values + $migration->getSourceConfiguration(), $source_ids, TRUE);

becomes

<?php
$stub_row = $this->createRow($values, $migration->getSourceConfiguration(), $source_ids);
<?php

Remaining tasks

Code & Tests

User interface changes

None.

API changes

API addition for process plugins extending migration.

Data model changes

None.

Comments

Grayside created an issue. See original summary.

Grayside’s picture

Grayside CreditAttribution: Grayside at Phase2 for Norwegian Cruise Line commented
Priority: Normal » Minor
Issue summary: View changes

I just realized that with some smart "fallback default" custom process plugins, you can back in a lot of the customizations this change would facilitate. On that basis dropping to Priority Minor.

Version: 8.3.x-dev » 8.4.x-dev

Drupal 8.3.0-alpha1 will be released the week of January 30, 2017, which means new developments and disruptive changes should now be targeted against the 8.4.x-dev branch. For more information see the Drupal 8 minor version schedule and the Allowed changes during the Drupal 8 release cycle.

quietone’s picture

quietone CreditAttribution: quietone as a volunteer commented
Related issues: +#2890690: MigrateLookup plugin has inconsistent return values., +#2891073: MigrationLookup doesn't create stub when there's multiple migrations., +#2890844: Migration Lookup plugin does not return multiple values when matched

Add related issues.

Version: 8.4.x-dev » 8.5.x-dev

Drupal 8.4.0-alpha1 will be released the week of July 31, 2017, which means new developments and disruptive changes should now be targeted against the 8.5.x-dev branch. For more information see the Drupal 8 minor version schedule and the Allowed changes during the Drupal 8 release cycle.

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quietone’s picture

quietone CreditAttribution: quietone as a volunteer commented
Title: Migration process plugin not extensible » MigrationLookup process plugin not extensible

Update the title with the new name of the plugin.

Version: 8.7.x-dev » 8.8.x-dev

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Drupal 8.8.0-alpha1 will be released the week of October 14th, 2019, which means new developments and disruptive changes should now be targeted against the 8.9.x-dev branch. (Any changes to 8.9.x will also be committed to 9.0.x in preparation for Drupal 9’s release, but some changes like significant feature additions will be deferred to 9.1.x.). For more information see the Drupal 8 and 9 minor version schedule and the Allowed changes during the Drupal 8 and 9 release cycles.

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Drupal 9.3.0-rc1 was released on November 26, 2021, which means new developments and disruptive changes should now be targeted for the 9.4.x-dev branch. For more information see the Drupal core minor version schedule and the Allowed changes during the Drupal core release cycle.

Version: 9.4.x-dev » 9.5.x-dev

Drupal 9.4.0-alpha1 was released on May 6, 2022, which means new developments and disruptive changes should now be targeted for the 9.5.x-dev branch. For more information see the Drupal core minor version schedule and the Allowed changes during the Drupal core release cycle.

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Version: 10.1.x-dev » 11.x-dev

Drupal core is moving towards using a “main” branch. As an interim step, a new 11.x branch has been opened, as Drupal.org infrastructure cannot currently fully support a branch named main. New developments and disruptive changes should now be targeted for the 11.x branch, which currently accepts only minor-version allowed changes. For more information, see the Drupal core minor version schedule and the Allowed changes during the Drupal core release cycle.

mikelutz’s picture

mikelutz
He/Him
Primary language English
Location Michigan, USA
CreditAttribution: mikelutz as a volunteer commented
Status: Active » Closed (outdated)

Stub creation was moved to a service in #3004927: Create Migration Lookup and Stub services making it overrideable.