I had a need to modify the behavior of the dependent facet processor so that a particular facet would show only when another facet had exactly one specific value selected. I initially tried to do this by simply implementing my own processor plugin, with its own plugin ID. However, when the dependee facet conditional value was unselected, the filter from my custom dependent facet was still applied. It turns out that the facet plugin manager hard codes a reference to the "dependent_processor" plugin ID in the logic that decides whether a dependent processor should be applied, meaning that it was not applying the same logic to my custom dependent processor plugin as it had its own ID.
I took another approach to this by modifying the facet processor plugin manager to allow for plugin overrides.
You will see that the filtering of the custom dependent facet is still applied on the underlying query.
I resolved this for myself by simply adding a line to the beginning of the constructor for the ProcessorPluginManager class that looks like:
$this->alterInfo('facet_processor_info');
This created a hook_facet_processor_info_alter() that I was then able to use for the purpose of creating a custom class that overrides the DependentFacetProcessor class while using the same plugin ID.
If the suggestion solution is acceptable, rolling a patch would be trivial.
Active
2.0
Code
Seems like a duplicate of
✨
Allow altering facets processor plugins through hook
Needs review
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I can see you used facet_ instead of facets_, could you elaborate why this is?
There's no special reason for me naming the hook with "facet" instead of "facets". If a patch with "facets" better conforms to coding conventions, here's an updated patch.