/facet/query_string
This filter is called before the content is queried from WP_Query, WP_Term_Query or WP_User_Query
It allows to filter content by adding facet slug/values in the query string. This filter is pretty useful to prefilter content on load.
| Argument | Type | Description |
| $query_string | array | Holds query strings parameters |
| $grid_id | mixed | Grid ID or template ID/name |
| $action | string | Current action type (render or refresh) |
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