Undeclared Dependency on `ai_search` Module

Module Information

• Module Name: AI VDB Provider - Postgres (ai_vdb_provider_postgres)
• Module Version: 1.0.0-alpha2
• Drupal Core Version: 11.3
• AI Module Version: 1.2

Bug Description

The ai_vdb_provider_postgres module has an undeclared dependency on the

ai_search</
      code> module. This causes a fatal error during Drupal's plugin discovery process, which prevents the "postgres
      VDB provider plugin from being registered.</p>
        <p>The error manifests as a <code>PluginNotFoundException

, stating that the "postgres" plugin does
not exist. The list of available plugins for AiVdbProviderPluginManager is empty.

Root Cause Analysis

The plugin class Drupal\ai_vdb_provider_postgres\Plugin\VdbProvider\PostgresProvider.php h
a use statement for an interface from the ai_search module:

use Drupal\ai_search\EmbeddingStrategyInterface;

However, the ai_vdb_provider_postgres.info.yml file does not list ai_search a
a dependency. If the ai_search module is not enabled, PHP cannot find the EmbeddingStrategyInterface, which causes a fatal error when the file is parsed. This silent failure
prevents the plugin from ever being discovered.

Steps to Reproduce

1. Set up a Drupal site with the ai module installed and enabled.
2. Ensure the ai_search module is disabled.
3. Install and enable the ai_vdb_provider_postgres module.
4. Clear all caches (e.g., run drush cr).
5. Attempt to access any page or run any Drush command that involves the VDB provider plugins (e.g.,
   visiting the module's configuration page).
6. Check the Drupal watchdog logs (Recent log messages). You will find an error like this:
   

   Drupal\Component\Plugin\Exception\PluginNotFoundException: The "postgres" plugin does n
         exist. Valid plugin IDs for Drupal\ai\AiVdbProviderPluginManager are:  in
         Drupal\Core\Plugin\DefaultPluginManager->doGetDefinition()

Resolution / Workaround

The issue is resolved by manually enabling the missing dependency:

1. Enable the ai_search module (e.g., run drush en ai_search -y).
2. Clear all caches (e.g., run drush cr).

After these steps, the plugin is correctly discovered and the module's configuration page can be saved
without a 500 error.

Suggested Fix

The dependency should be explicitly declared. Please add ai_search:ai_search to the dependencies section of the ai_vdb_provider_postgres.info.yml file.

    dependencies:
      - ai:ai
      - key:key
      - ai_search:ai_search