Nested Meta Query with post_where and multiple relation keys - mysql

Question

I'm trying to add aWP_Query with
post_where filter and WP_META_QUERY to a wordpress main query:
function example_range_m2( $where ) {
$min_price = doubleval($_GET['min-price']);
$max_price = doubleval($_GET['max-price']);
$query_args = array( 'meta_query' => array(
'relation' => 'OR',
array(
'key' => 'PREFIX_min_property_price_m2',
'value' => array($min_price, $max_price),
'type' => 'NUMERIC',
'compare' => 'BETWEEN'
),
array(
'key' => 'PREFIX_max_property_price_m2',
'value' => array($max_price, $min_price),
'type' => 'NUMERIC',
'compare' => 'BETWEEN'
),
) );
$query_args2 = array('meta_query' => array(
'relation' => 'AND',
array(
'key' => 'PREFIX_min_property_price_m2',
'value' => $min_price,
'compare' => '<=',
'type' => 'NUMERIC'
),
array(
'key' => 'PREFIX_max_property_price_m2',
'value' => $max_price,
'compare' => '>=',
'type' => 'NUMERIC'
),
));
$meta_query = new WP_Meta_Query();
$meta_query->parse_query_vars( $query_args );
$mq_sql = $meta_query->get_sql(
'post',
$wpdb->posts,
'ID',
null
);
$tmp_one = str_replace('mt1', 'example_postmeta', $mq_sql['where']) . ' ';
echo $tmp_one;
$meta_query = new WP_Meta_Query();
$meta_query->parse_query_vars( $query_args2 );
$mq_sql = $meta_query->get_sql(
'post',
$wpdb->posts,
'ID',
null
);
$tmp_two = str_replace('mt1', 'example_postmeta', $mq_sql['where']) . ' ';
$where .= $tmp_one . ' OR ' . $tmp_two;
return $where;
}
The first query_args have to determine whether one of the custom_meta_field value are between the given range.
The secound query_args have to determine whether values in the database make a range that contains given range.
I need to make wordpress to query database:
SELECT post_meta WHERE
(meta_value1 BETWEEN min MAX max) OR (meta_value2 BETWEEN min AND max)
OR (meta_value1 <= min AND meta_value2 >= max)
var_dump of main wordpress query gives me following request:
SELECT SQL_CALC_FOUND_ROWS example_posts.id
FROM example_posts
INNER JOIN example_postmeta
ON ( example_posts.id = example_postmeta.post_id )
WHERE
1 = 1
AND example_posts.post_type = 'property'
AND (
example_posts.post_status = 'publish'
OR
example_posts.post_status = 'private'
)
AND ( example_postmeta.meta_key = 'PREFIX_min_property_price_m2' )
AND (
(
example_postmeta.meta_key = 'PREFIX_min_property_price_m2'
AND
Cast(example_postmeta.meta_value AS signed) BETWEEN '1000' AND '9000'
)
OR
(
example_postmeta.meta_key = 'PREFIX_max_property_price_m2'
AND
Cast(example_postmeta.meta_value AS signed) BETWEEN '9000' AND '1000'
)
)
OR
And (
(
example_postmeta.meta_key = 'PREFIX_min_property_price_m2'
AND
Cast(example_postmeta.meta_value AS signed) <= '1000'
)
AND
(
example_postmeta.meta_key = 'PREFIX_max_property_price_m2'
AND Cast(example_postmeta.meta_value AS signed) >= '9000'
)
)
GROUP BY example_posts.id
ORDER BY example_postmeta.meta_value + 0 ASC
LIMIT 0, 4
I need this to work with main WP_Query in order to maintain WP and template logic.
I have one post that should work with request and it just doesn't.
I'm a SQL Noob if that is not obvious ;)

Answer 1

Ok. After a strong brainstorming session with myself and a piece of paper and pen I understood that I can rephrase my query / 'problem' with totally different conditions.
I was trying write a query that will return all the objects with a range of values that meet a range. I decided that I will work on maximum and minimum values in a different way, so I came up with meta query that could be used in standard WP_QUERY:
/* Logic for Min and Max Price Parameters */
if( isset($_GET['min-price']) && ($_GET['min-price'] != 'any') && isset($_GET['max-price']) && ($_GET['max-price'] != 'any') ){
$min_price = doubleval($_GET['min-price']);
$max_price = doubleval($_GET['max-price']);
if( $min_price >= 0 && $max_price > $min_price ){
$meta_query[] = array(
'key' => 'EXAMPLE_max_property_price_m2',
'value' => $min_price,
'type' => 'NUMERIC',
'compare' => '>='
);
$meta_query[] = array(
'key' => 'EXAMPLE_min_property_price_m2',
'value' => $max_price,
'type' => 'NUMERIC',
'compare' => '<='
);
}
}elseif( isset($_GET['min-price']) && ($_GET['min-price'] != 'any') ){
$min_price = doubleval($_GET['min-price']);
if( $min_price > 0 ){
$meta_query[] = array(
'key' => 'EXAMPLE_max_property_price_m2',
'value' => $min_price,
'type' => 'NUMERIC',
'compare' => '>='
);
}
}elseif( isset($_GET['max-price']) && ($_GET['max-price'] != 'any') ){
$max_price = doubleval($_GET['max-price']);
if( $max_price > 0 ){
$meta_query[] = array(
'key' => 'EXAMPLE_min_property_price_m2',
'value' => $max_price,
'type' => 'NUMERIC',
'compare' => '<='
);
}
}
This allowed me to cover all the objects I while comparing ranges.