Doctrine

The bundle registers the column type phil_content_warnings when DoctrineBundle is enabled. It keeps a ContentWarnings in one JSON column, as ContentWarnings::toArray() writes it, and works on any entity:

use Phil\ContentWarnings\ContentWarnings;

#[ORM\Column(type: 'phil_content_warnings', nullable: true)]
private ?ContentWarnings $warnings = null;

[{"theme":"gore","severity":"severe","note":"The final battle"},{"theme":"spiders"}]

null is stored as SQL NULL, and no warnings as []. A value that is neither null nor ContentWarnings is refused with Doctrine's InvalidType. A stored value that is not JSON, nests deeper than a warning, or is anything ContentWarnings::fromArray() refuses throws Doctrine's ValueNotConvertible, the cause attached.

Warnings name themes by key: a theme removed from the catalogue stays in the column, and display falls back to its key.