查询由post_object自定义字段过滤的帖子

问题描述：

I am trying to query any post which has a certain post_object selected as its "parent". The parent value will have to match the ID of the current post. I have been able to replicate this functionality by querying all posts of this post type and then comparing the values within the loop, like so:

<?php
    $wp_query = new WP_Query();
    $wp_query->query(  array (
        'post_type' => 'my_post_type',
        'meta_key'=>'post_object_field'
)); 

if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>

    <?php 
    $parent = get_field('post_object_field'); 
    $parentId = $parent->ID; ?>

    <?php if ($postId == $parentId): ?>

        // content 

    <?php endif; ?>
<?php endwhile; endif; ?>

I'm wonder if there is a way to check for this value inside the query, and if so, if it's any faster or more correct.

我正在尝试查询任何已选择某个post_object作为其“父”的帖子。父值必须与当前帖子的ID匹配。我能够通过查询此帖子类型的所有帖子然后比较循环中的值来复制此功能，如下所示： p>

 ＆lt;？php 
 $ wp_query  = new WP_Query（）; 
 $ wp_query-＆gt; query（array（
'post_type'=＆gt;'my_post_type'，
'meta_key'=＆gt;'post_object_field'
））;  
 
if（have_posts（））：while（have_posts（））：the_post（）;  ？＆gt; 
 
＆lt;？php 
 $ parent = get_field（'post_object_field'）;  
 $ parentId = $ parent-＆gt; ID;  ？＆gt; 
 
＆lt;？php if（$ postId == $ parentId）：？＆gt; 
 
 // content = n 
＆lt;？php endif;  ？＆gt; 
＆lt;？php endwhile; 万一;  ？＆gt; 
  code>  pre> 
 
 我很想知道是否有办法在查询中检查这个值，如果是，那么它是否更快或更正确。   p> 
  div>

答

To get all the posts/pages that are children of a given post/page, you can use the parameter post_parent, using the ID of the parent post.

For example, if you have a post

$wp_query->query(  array (
    'post_type'    => $children_post_type
    'post_parent'  => $postId
));

And of course, yes, performing a query will be much more efficient than performing a query + getting a field value + creating a variable + looping the results making a comparison...

EDIT: According to your comments, it seems that you're actually trying to get all those posts that have a given value in a custom field of type Post Object. This field contains a number, which is the ID of the post it relates to, so you just need to add a parameter meta_value_num in your query:

$wp_query->query(  array (
    'post_type'      => 'my_post_type',
    'meta_key'       => 'post_object_field'
    'meta_value_num' => $postId
));

This will retrieve all the posts that have a custom field called post_object_field with a value $postId.

EDIT: Try this:

$args = array(
'post_type'  => 'my_post_type',
'meta_query' => array(
    array(
        'key'     => 'post_object_field',
        'value'   => $postId,
        'compare' => '='
    )
)
);

答

I was able to filter the results within the query using:

<?php
    $wp_query = new WP_Query();
    $wp_query->query(  array (
        'post_type' => 'my_post_type',
        'meta_query' => array(
            array(
                'key' => 'post_object_field',
                'value' => $postId,
                'compare' => '=='
            )
         )
    )); 

if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>

    // content 

<?php endwhile; endif; ?>

答

<?php
$wp_query = new WP_Query();
$wp_query->query(  array (
    'post_type' => 'my_post_type',
    'meta_query' => array(
        array(
            'key' => 'post_object_field',
            'value' => $postId,
            'compare' => '=='
        )
     )
));

if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>

// content

enter code here

查询由post_object自定义字段过滤的帖子

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