来自自定义字段的查询字符串参数，结果不一致

我有一个自定义的帖子类型叫做course. 在课程帖子中，我有许多自定义字段，特别是（所有AFC select下拉列表）：course_or_project, time_to_complete_project, time_to_complete_course 和difficulty. 我还有一个分类法叫做course_project_category.

我的目标是能够创建许多下拉列表/滑块，通过读取所述下拉列表/滑块的值并单击搜索按钮来构建URL，使用我组合的查询字符串（jQuery）来筛选正确的帖子。此功能完全正常。好有时结果有点混乱，即仅通过一些参数进行过滤。

转到代码。

我在中添加了一个函数以公开自定义字段：

function my_pre_get_posts( $query ) {

// do not modify queries in the admin
if( is_admin() ) {
    return $query;
}

// only modify queries for \'course\' post type
if( isset($query->query_vars[\'post_type\']) && $query->query_vars[\'post_type\'] == \'course\' ) {

    // allow the url to alter the query
    if( isset($_GET[\'course_or_project\']) ) {
        $query->set(\'meta_key\', \'course_or_project\');
        $query->set(\'meta_value\', $_GET[\'course_or_project\']);
    } 

    if( isset($_GET[\'time_to_complete_project\']) ) {
        $query->set(\'meta_key\', \'time_to_complete_project\');
        $query->set(\'meta_value\', $_GET[\'time_to_complete_project\']);
    } 

    if( isset($_GET[\'time_to_complete_course\']) ) {
        $query->set(\'meta_key\', \'time_to_complete_course\');
        $query->set(\'meta_value\', $_GET[\'time_to_complete_course\']);    
    } 

    if( isset($_GET[\'difficulty\']) ) {    
        $query->set(\'meta_key\', \'difficulty\');
        $query->set(\'meta_value\', $_GET[\'difficulty\']);
    } 

}

// return
return $query;

}

add_action(\'pre_get_posts\', \'my_pre_get_posts\');

查询分类法似乎是现成的。

因此，我完成的URL的一个示例可能是：

http://localhost:3000/courses/?course_project_category=jokes&course_or_project=project&difficulty=easy&time_to_complete_project=15

目前我的结果好坏参半。

从上面的查询中，我返回了2篇文章，它们大部分符合我的条件，但作为一个具体的例子，一篇文章有time_to_complete_project 值为30 即使指定了查询15.

我想不出来。通过Chrome开发工具，我可以看到所有参数都如预期的那样：

有什么想法吗？！

Update

我有一种新的方法正在发挥作用（但缺乏验证和卫生）：

// array of filters (field key => field name)
    $GLOBALS[\'my_query_filters\'] = array( 
        \'field_1\'   => \'course_or_project\', 
        \'field_2\'   => \'difficulty\',
        \'field_3\'   => \'time_to_complete_project\',
        \'field_4\'   => \'time_to_complete_course\'
    );
// action

add_action(\'pre_get_posts\', \'my_pre_get_posts\', 10, 1);

function my_pre_get_posts( $query ) {

    // bail early if is in admin
    if( is_admin() ) {

        return;

    }

    if( isset($query->query_vars[\'post_type\']) && $query->query_vars[\'post_type\'] == \'course\' ) {

        // get meta query
        $meta_query = $query->get(\'meta_query\');


        // loop over filters
        foreach( $GLOBALS[\'my_query_filters\'] as $key => $name ) {

            // continue if not found in url
            if( empty($_GET[ $name ]) ) {

                continue;

            }


            // get the value for this filter
            // eg: http://www.website.com/events?city=melbourne,sydney
            $value = explode(\',\', $_GET[ $name ]);


            // append meta query
            $meta_query[] = array(
                \'key\'       => $name,
                \'value\'     => $value,
                \'compare\'   => \'IN\',
            );

        } 


        // update meta query
        $query->set(\'meta_query\', $meta_query);

    }

}

// action add_action(\'pre_get_posts\', \'my_pre_get_posts\', 10, 1); function my_pre_get_posts( $query ) { // bail early if is in admin if( is_admin() ) { return; } if( isset($query->query_vars[\'post_type\']) && $query->query_vars[\'post_type\'] == \'course\' ) { // array of filters (field key => field name) $GLOBALS[\'my_query_filters\'] = array( \'field_1\' => \'course_or_project\', \'field_2\' => \'difficulty\', \'field_3\' => \'time_to_complete_project\', \'field_4\' => \'time_to_complete_course\' ); // get meta query $meta_query = $query->get(\'meta_query\'); // loop over filters foreach( $GLOBALS[\'my_query_filters\'] as $key => $name ) { // sanitize parameter $name = filter_input( INPUT_GET, $name, FILTER_SANITIZE_STRING ); // continue if not found in url if( empty($_GET[ $name ]) ) { continue; } // get the value for this filter // eg: http://www.website.com/events?city=melbourne,sydney $value = explode(\',\', $_GET[ $name ]); // append meta query $meta_query[] = array( \'key\' => $name, \'value\' => $value, ); } // update meta query $query->set(\'meta_query\', $meta_query); } }

add_action( \'pre_get_posts\', function ( $q ) { if ( !is_admin() // Do this only on the front end && $q->is_main_query() // Targets the main query only ) { if( isset($query->query_vars[\'post_type\']) && $query->query_vars[\'post_type\'] == \'course\' ) { // Not sure about this, can be $q->is_post_type_archive( \'course\' ) // Get all our $_GET variables and sanitize and validate them $course_or_project = filter_input( INPUT_GET, \'course_or_project\', FILTER_SANITIZE_STRING ); $time_to_complete_project = filter_input( INPUT_GET, \'time_to_complete_project\', FILTER_SANITIZE_STRING ); $time_to_complete_course = filter_input( INPUT_GET, \'time_to_complete_course\', FILTER_SANITIZE_STRING ); $difficulty = filter_input( INPUT_GET, \'difficulty\', FILTER_VALIDATE_INT ); // Set our variable to hold the meta_query $meta_query = []; // Now we build our meta_query if( $course_or_project ) { $meta_query[] = [ \'key\' => \'course_or_project\', \'value\' => $course_or_project ]; } if( $time_to_complete_project ) { $meta_query[] = [ \'key\' => \'time_to_complete_project\', \'value\' => $time_to_complete_project ]; } if( $time_to_complete_course ) { $meta_query[] = [ \'key\' => \'time_to_complete_course\', \'value\' => $time_to_complete_course ]; } if( $difficulty ) { $meta_query[] = [ \'key\' => \'difficulty\', \'value\' => $difficulty ]; } // Make sure we have something in $meta_query before setting it if ( $meta_query ) $q->set( \'meta_query\', $meta_query ); } } });

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