Provide useful error message for: The "" plugin does not exist on Drupal 6 / 7 migrations

The "" plugin does not exist. Valid plugin IDs for Drupal\migrate\Plugin\Mi gratePluginManager are: addressfield, block_plugin_id, block_region, block_ settings, block_theme, block_visibility, field_type, process_field, field_f ormatter_settings_defaults, d6_field_instance_defaults, d6_field_instance_o ption_translation, d6_field_field_settings, field_instance_widget_settings, d6_field_option_translation, field_settings, d6_field_type_defaults, field _bundle, d7_field_instance_defaults, d7_field_instance_option_translation, d7_field_instance_settings, d7_field_option_translation, d7_field_settings, d7_field_type_defaults, d7_field_permission_settings, d6_field_file, file_ uri, filter_id, filter_settings, filter_format_permission, geofield_d7d8, g eofield_field_settings, geofield_latlon, geofield_wkt, google_analytics_vis ibility_pages, google_analytics_visibility_roles, d6_imagecache_actions, in line_entity_form_field_instance_settings, field_link, link_options, link_ur i, d6_nodewords_entities, d7_metatag_entities, array_build, callback, conca t, default_value, download, entity_exists, explode, extract, file_copy, fla tten, format_date, get, log, machine_name, make_unique_entity_field, menu_l ink_parent, migration_lookup, null_coalesce, route, skip_on_empty, skip_row _if_not_set, static_map, sub_process, substr, urlencode, debug, node_comple te_node_lookup, node_complete_node_revision_lookup, node_complete_node_tran slation_lookup, array_pop, array_shift, default_entity_value, dom, dom_appl y_styles, dom_migration_lookup, dom_remove, dom_select, dom_str_replace, en tity_generate, entity_lookup, entity_value, file_blob, gate, merge, multipl e_values, service, single_value, skip_on_value, str_replace, transliteratio n, transpose, node_update_7008, path_set_translated, d6_url_alias_language, d6_path_redirect, d7_path_redirect, d7_redirect_source_query, search_confi guration_rankings, system_update_7000, timezone, forum_vocabulary, convert_ tokens, profile_field_settings, user_langcode, user_update_8002, d6_profile _field_option_translation, user_update_7002, field_collection_field_instanc e_settings, field_collection_field_settings, paragraphs_field_instance_sett ings, paragraphs_field_settings, paragraphs_lookup, paragraphs_process_on_v alue

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It's likely this issue predates Contrib.social: some issue and comment data are missing.

Comment 4 months ago →
🇩🇪Germany Grevil
Patch from #26 still perfectly applies on 11.x.

Comment 3 months ago →

🇩🇪Germany Anybody Porta Westfalica

Also with this patch enabled, the root cause seems to be that an array containing the plugin arrays is passed to the method where we added the exception.
The array with the "plugin" key is one level deeper. The question is, why this happens!

Example:
drush migrate:import --group=xyz --continue-on-failure

throws this exception with the patch applied

Missing required 'plugin' property for 'vid' in migration: 'upgrade_d7_taxonomy_vocabulary'

because the following array in array is passed:

array(2) {
  [0]=>
  array(6) {
    ["plugin"]=>
    string(24) "make_unique_entity_field"
    ["source"]=>
    string(12) "machine_name"
    ["entity_type"]=>
    string(19) "taxonomy_vocabulary"
    ["field"]=>
    string(3) "vid"
    ["length"]=>
    int(30)
    ["migrated"]=>
    bool(true)
  }
  [1]=>
  array(2) {
    ["plugin"]=>
    string(16) "forum_vocabulary"
    ["machine_name"]=>
    string(6) "forums"
  }
}

In Migration.php line 733:

The .yml part looks like this:

[...]
source:
  plugin: d7_taxonomy_vocabulary
process:
  vid:
    -
      plugin: make_unique_entity_field
      source: machine_name
      entity_type: taxonomy_vocabulary
      field: vid
      length: 30
      migrated: true
    -
      plugin: forum_vocabulary
      machine_name: forums
[...]

Provide useful error message for: The "" plugin does not exist on Drupal 6 / 7 migrations

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