回答編集履歴
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追記
answer
CHANGED
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@@ -2,4 +2,59 @@
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[get_meta_sql](https://developer.wordpress.org/reference/hooks/get_meta_sql/)で当該のフィールドを
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``CAST(REPLACE(meta_value,',','') AS DECIMAL)``した値で
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エイリアス名をつけてJOINしておいておき、それをorderbyに指定する
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エイリアス名をつけてJOINしておいておき、それをorderbyに指定する
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---
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参考までに
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ウチのプラグインの複数のフィールドの値を利用した計算結果を利用して
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meta_queryを書けるようにするためのフィルタフックとメソッド
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meta_queryで指定したエイリアス名をorderbyに使えるようにもなってます
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```php
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add_filter('get_meta_sql',function($sql,$queries,$type,$primary_table,$primary_id_column,$context){
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$meta_table=_get_meta_table($type);
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foreach($queries as $key=>$query){
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if(!is_array($query) || empty($query['compute'])){continue;}
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if(empty($query['alias'])){error_log('compute meta_query must have alias');continue;}
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if(empty($query['keys'])){error_log('compute meta_query must have keys');continue;}
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$sql['join'].=
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" LEFT JOIN (".
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Catpow\util\sql\meta::select_computed_value($type,$meta_table,$query['keys'],$query['compute'],$query['where']??null).
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") AS {$query['alias']} ".
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"ON ({$primary_table}.{$primary_id_column} = {$query['alias']}.{$type}_id) ";
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}
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return $sql;
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},10,6);
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add_filter('meta_query_find_compatible_table_alias',function($alias,$clause){
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if(isset($clause['alias'])){return $clause['alias'];}
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return $alias;
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},10,2);
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```
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```php
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namespace Catpow\util\sql;
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class meta extends sql{
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public static function select_computed_value($type,$table,$keys,$compute,$where=null){
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$primary_alias=key($keys);
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$primary_key=array_shift($keys);
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if(is_numeric($primary_alias)){$primary_alias = $primary_key;}
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$sql="SELECT {$primary_alias}.{$type}_id,({$compute}) AS meta_value FROM {$table} AS {$primary_alias} ";
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foreach($keys as $alias=>$key){
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if(is_numeric($alias)){$alias = $key;}
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$sql.=
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"INNER JOIN {$table} AS {$alias} ".
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"ON {$primary_alias}.{$type}_id = {$alias}.{$type}_id ".
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"AND {$alias}.meta_key = '{$key}' ";
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}
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$sql.="WHERE {$primary_alias}.meta_key = '{$primary_key}'";
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if(isset($where)){$sql.=' AND '.$where;}
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return $sql;
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}
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}
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```
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