Issue #2667366 by mikeryan: Make migrate_plus work with 8.1.x.

migrate_example/config/install/migrate.migration.beer_comment.yml → migrate_example/migrations/migrate.migration.beer_comment.yml

@@ -6,6 +6,7 @@ third_party_settings:
     migration_group: beer
 source:
   plugin: beer_comment
+  key: default
 destination:
   plugin: entity:comment
 process:

migrate_example/config/install/migrate.migration.beer_node.yml → migrate_example/migrations/migrate.migration.beer_node.yml

@@ -6,6 +6,7 @@ third_party_settings:
     migration_group: beer
 source:
   plugin: beer_node
+  key: default
 destination:
   plugin: entity:node
 process:

migrate_example/config/install/migrate.migration.beer_term.yml → migrate_example/migrations/migrate.migration.beer_term.yml

@@ -26,6 +26,7 @@ third_party_settings:
 # src/Plugin/migrate/source/BeerTerm.php.
 source:
   plugin: beer_term
+  key: default
 
 # Every migration must also have a destination plugin, which handles writing
 # the migrated data in the appropriate form for that particular kind of data.

migrate_example/config/install/migrate.migration.beer_user.yml → migrate_example/migrations/migrate.migration.beer_user.yml

@@ -8,6 +8,7 @@ third_party_settings:
     migration_group: beer
 source:
   plugin: beer_user
+  key: default
 destination:
   plugin: entity:user
 process:

migrate_plus.module

@@ -12,10 +12,19 @@ use Drupal\migrate_plus\Entity\MigrationGroup;
 use Drupal\migrate_plus\Event\MigrateEvents;
 use Drupal\migrate_plus\Event\MigratePrepareRowEvent;
 
+/**
+ * Implements hook_migration_plugins_alter().
+ */
+function migrate_tools_migration_plugins_alter(array &$migrations) {
+  // @todo: Implement group merging here.
+}
+
 /**
  * Implements hook_ENTITY_TYPE_load().
  */
 function migrate_plus_migration_load($migrations) {
+  // @todo: Replace with hook_migration_plugins()
+  return;
   /** @var MigrationInterface $migration */
   foreach ($migrations as $migration) {
     // If we are pointing to a valid group, merge its properties into ours.