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PrestaShop front-office provides a faceted search capability, powered by the module https://github.com/PrestaShop/ps_facetedsearch/
The module allows customers to search for products using multiple filters and mix them.
It is built on the top of a filtering engine that maps user input to SQL queries.
This feature was available in PrestaShop before 1.7 through the module
Blocklayered module was attempting to emulate the
CategoryController and fetch templates from the theme without any guarantee of the templates being there.
Any change in the behavior of the
CategoryController or a template renaming required
blocklayered module, and themes had to adapt to this change too.