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Let's say I have two custom entity types: entity_one, entity_many.

I know how to use an EntityQuery to find entity_one matches if there is a multi-value entity reference field on entity_one.

$results = \Drupal::entityTypeManager()->getStorage('entity_one`)
    ->getQuery()
    ->condition('field_referencing_many.entity:entity_many.field_string', $value)
    ->execute();

but what if there was no entity_one.field_referencing_many and instead there was a entity_many.field_reference_one that allows each entity_many child entity to reference its parent? Is there any magic in EntityQuery that would allow the tables to be joined and queried with that reverse entity_reference field? I still want results from entity_one storage.

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  • Simply query the field directly in that case ->condition('field_referencing_one', $value) where $value is the entity ID you want references to. Nov 10, 2023 at 16:39
  • I don't know the entity_one IDs that I want. That is the point of the query :) I also don't know the entity_many IDs. All I know is entity_many.field_string has a value of $value. (this is obviously a made up example)
    – JonMcL
    Nov 10, 2023 at 17:39
  • OK so you want to filter on that key and get the related entities (rather than the original entities). I would think this is probably easier to achieve using a SELECT query rather than an entity query, but that doesn't answer your question so hopefully somebody else can, Nov 11, 2023 at 18:28

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