php - Wordpress tax_query "and" operator not functioning as expected -

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i have custom post type of image custom taxonomy called image_tag (it's hierarchical categories). here examples of tags might used:

structure (id: 25) - house (id: 56) - skyscraper nature - animal - plant (id: 41)

so, want drill down through images selecting multiple tags in conjunction "and" operator. example, finding photos plants , houses.

$query_args = array(   'post_type' => 'image',   'tax_query' => array(     array(       'taxonomy' => 'image_tag',       'terms' => array(41, 56),    // ids of "plant" , "house"       'operator' => 'and',     ),   ), );

that works fine, problem begins when try include parent terms, example:

$query_args = array(   'post_type' => 'image',   'tax_query' => array(     array(       'taxonomy' => 'image_tag',       'terms' => array(25, 41),    // ids of "structure" , "plant"       'operator' => 'and',     ),   ), );

then no results. i'm guessing because i'm using "and" operator, wordpress doesn't include children of "structure" term. have idea how can work?

so should this:

'relation' => 'and',    array(          'taxonomy' => 'image_tag',           'field'    => 'term_id',           'terms'    => array( 25 ),          ),          array(          'taxonomy' => 'image_tag',           'field'    => 'term_id',           'terms'    => array( 41 ),           ),         ),

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