Migrate custom source plugin not found

Question

I have a fairly simple D6->D8 migration, and I need a custom source plugin for one of my node migrations. As far as I can tell, I have everything written and structured properly, but when I click on the migration group in the admin UI, I get a message that my source plugin doesn't exist.

Here's the relevant part of my node migration config:

In /my-module/config/install/migrate_plus.migration.video.yml:

id: video
label: Video
migration_tags:
  - Drupal 6
deriver: Drupal\node\Plugin\migrate\D6NodeDeriver
migration_group: node
source:
  plugin: mrctvVideoSource
  node_type: video
process:

and my source plugin in /my_module/src/Plugin/migrate/source/mrctvVideoSource.php:

namespace Drupal\migrate_mrctv\Plugin\migrate\source;

use Drupal\migrate\Plugin\migrate\source\SqlBase;
use Drupal\migrate\Row;

/**
 * Source plugin for MRCTV video nodes.
 *
 */
class mrctvVideoSource extends SqlBase {

  /**
   * @MigrateSource(
   *   id = "mrctvVideoSource"
   * )
   */
  public function query() {
    return $this->select('view_videos', 'vv')
                ->fields('vv', array_keys($this->fields()));
  }

  /**
   * {@inheritdoc}
   */
  public function fields() {
    $fields = [
      'video_data' => $this->t('Video Data'),
      'thumbnail_data' => $this->t('Thumbnail Data'),
      'show_ads' => $this->t('Show Ads'),
      'raw_s3_file' => $this->t('Raw S3 File'),
      'nid' => $this->t('Node ID'),
      'vid' => $this->t('Version ID'),
      'title' => $this->t('Nond Title'),
      'node_created' => $this->t('Created'),
      'node_changed' => $this->t('Changed'),
      'node_uid' => $this->t('Node User'),
      'node_body' => $this->t('Body'),
      'teaser' => $this->t('Teaser'),
      'revsion_uid' => $this->t('Revision UID'),
      'log' => $this->t('Revision Log'),
      'timestamp' => $this->t('Revision Timestamp'),
    ];

    return $fields;
  }
}

From what I can tell, I have everything named and annotated properly and in the correct locations, but I'm obviously missing something. What is it?

Thanks.

UPDATE: Per Mike Ryans'suggestion below, I changed the id of my plugin (after clearing cache) from 'mrctvVideoSource' to 'mrctv_video_source', both in the migration yml file and the id annotation in my plugin definition (is there anywhere else I need to change it?). But now, after uninstalling my module (and having to manually delete the config records in the config database again, config_devel doesn't seem to be clearing anything out), my node migrations are not even listed on the Migration page. Sigh. Still troubleshooting...

Answer 1

Obvious question - did you rebuild cache (drush cr)?

The only odd thing I see is having a mixed-case plugin ID - what if you made it all lower-case?

Answer 2

I think you need to have your annotation outside of the class

/**
 * Source plugin for MRCTV video nodes.
 *
 * @MigrateSource(
 *   id = "mrctvVideoSource"
 * )
 */
class mrctvVideoSource extends SqlBase {

Answer 3

I had a similar PluginNotFoundException for my custom source plugin today. It turned out that during a faulty configuration merge (via git) and the following configuration import my migration plugin got deactivated.

My migration group was still showing up in the Migrate UI because i was using a drush config-import after every change in the fieldmapping:

drush config-import --partial --source="modules/my_migration/config/install"

Because I basically hid the symptoms of a disabled module with the config-import, it took me some time to find the real problem.