Add "Not Related To" to element queries

[nfourtythree]

Description

Adds functionality to query elements that are not related to other elements.

This is possible with element queries in PHP, Twig and also via GraphQL.

A new "Not Related To" condition rule has also been added.

Some example twig code:

{# Where `entryA` and `entryB` are assumed to be valid entries retrieve from the system #}

{# Not related to `entryA` #}
{% set entries = craft.entries.notRelatedTo(entryA).all() %}

{# Related to `entryA` but not `entryB` #}
{% set entries = craft.entries.relatedTo(entryA).notRelatedTo(entryB).all() %}

{# Not related to `entryA` and `entryB` #}
{% set entries = craft.entries.notRelatedTo(['and', entryA, entryB]).all() %}

{# Not related to `entryA` and `entryB` using `andNotRelatedTo()` #}
{% set entries = craft.entries.notRelatedTo(entryA).andNotRelatedTo(entryB).all() %}

Example GraphQL:

{
  entries(notRelatedTo: ["123"]) {
    id
    title
    slug
  }
}

Related issues

• Add ability to grab entries NOT related to category #8992
• Element criteria in control panel filters - add "is not related to" to relation field based filters #15333

[linear]

CMS-1306 Add "Not Related To" functionality for element queries