nellone

I’m having some trouble with the query
My post are intended to be of custom type only, so i used pre_get_posts hook to modify the main loop, then i use the query->set to filter posts

add_action( 'pre_get_posts', 'filtri_di_ricerca');
function filtri_di_ricerca( $query ) {
    if ( is_admin() || ! $query->is_main_query() )
        return;

    if (is_home())
	{
		$query->set('post_type', 'post_annunci');  

		$meta_query = array('relation' => 'AND');

		// Only check these form fields
		$fields = array( 'annuncio_contratto', 'annuncio_categoria', 'annuncio_tipologia', 'annuncio_citta');

		foreach( $fields as $field )
		{
			if( $_GET[$field] != '' )
			{
				// We have something to match, otherwise ignore the field...
				$meta_query[] = array(
					'key' => $field,
					'value' => $_GET[$field],
					'compare' => '='
				);
			}
		}

		$query->set('meta_query',$meta_query);

    }

I have some problem obtaining the meta keys as _simple_fields_fieldGroupID_1_fieldID_3_numInSet_0 instead of $fields, because in the search form i use input fields slugs as input names, so my $_GET variabiles are like annuncio_contratto=dropdown_num_16

I seen an example in your blog post where you can order by the field slug, is there a similar way to launch a query with a field_slug?
Or get the meta_key giving the slug?
I cannot figure out to use action_pre_get_posts_meta($query)

Is there not a specific post ID to pass, i need to find all posts matching the search query sent by the user.
To create the search query i need to build a form with inputs named as simple fields names and with related values.