Facet by Meta

[felipeelia]

Description of the Change

This PR is the following step to #2919, implementing a new type for meta fields.

It still needs tests.

How to test the Change

Changelog Entry

Added - New block to facet by meta fields

Credits

Props @felipeelia

[tott]

Just some minor comments. One thing i'm wondering though - How will things work when people have multiple facet blocks of the same type. I did not see any variation in filters based on the block id or the like. Have you tested this?

[tott]

would it make sense to provide more context in the filter to be able to make a decision?

[felipeelia]

Addressed in f9ae942. I will apply a similar change to #2919 as well, especially for the renderer class part.

[tott]

wondering if we need to truncate those values. there could be huge data in meta fields eventually. maybe truncate out only first 100 chars or so?

[felipeelia]

As I can see some usefulness in bringing more data in other scenarios, in 2626fb4 I've added the number as a parameter.

[felipeelia]

With the change made in 7c1b813, this is the code needed to make Facet by Meta blocks available:

add_filter(
	'ep_facet_types',
	function ( $facet_types ) {
		if ( ! isset( $facet_types['meta'] ) && class_exists( '\ElasticPress\Feature\Facets\Types\Meta\FacetType' ) ) {
			$facet_types['meta'] = '\ElasticPress\Feature\Facets\Types\Meta\FacetType';
		}
		return $facet_types;
	}
);