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Using the entity query API to identify entities with correlated values

Imagine two Drupal 9 custom entity types named a and b.

Entity type a has two fields a_f1 and a_f2.

Entity type b has a field b_a which is an entity reference with a target type of a and unlimited cardinality.

How does one create an entity query which finds all entities of type b at least one of whose b_a entity references points to an a entity which has value ‘v1’ for its field a_f1 and value ‘v2’ for its field a_f2?

It’s not appropriate in this case to find a b which has one entity reference pointing to an a entity with a_f1 of ‘v1’ but a_f2 of ‘something else’, and another entity reference pointing to a different a entity with a_f2 of ‘v2’ but a_f1 of ‘wrong value’.

I could do this in my sleep with direct SQL queries, but that’s frowned on in the Drupal world. I’m having a hard time finding the guidance for doing this the Drupal Way in the official Drupal documentation.

Does the Drupal entity query API support this functionality?

This article was republished from its original source.
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Using the entity query API to identify entities with correlated values

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