ACF关系字段-其他帖子类型的get_field值 [英] ACF relationship fields - get_field values from other post type

问题描述

在我的POSTS页面（常规帖子类型）中，我设置了ACF关系字段。在其中，我可以选择公司名称，这些公司名称都在directory_listings的帖子类型下。

In my POSTS page (regular post type), I have setup a ACF relationship field. Inside this I can select company name which are all under the post type of directory_listings.

现在，我在目录列表页面上具有以下代码，因此只需使用get_field无法使用，因为这些值不在此页面上，而是在POST类型上的其他位置。

Now, I have the following code on the directory listings page, and therefore using simply get_field does not work because those values are not on this page, they are elsewhere on the POST type instead.

因此不确定如何获取信息。

So unsure how to grab the information.

其中一个页面上DIRECTORY_LISTINGS帖子类型下的代码：

$posts = get_field('related_articles');

if( $posts ): ?>
    <ul>
    <?php foreach( $posts as $post): // variable must be called $post (IMPORTANT) ?>
        <?php setup_postdata($post); ?>
        <li>
            <a href="<?php the_permalink(); ?>"><?php the_title(); ?></a>
        </li>
    <?php endforeach; ?>
    </ul>
    <?php wp_reset_postdata(); // IMPORTANT - reset the $post object so the rest of the page works correctly ?>
<?php endif; ?>

示例图，因为我不太喜欢通过文字解释。

Example diagram as I am not great with explaining via text.

目前我有而是在公司编辑页面（directory_listing）上设置关系字段。它在执行以下操作时会起作用：
1）与该企业列表相关的帖子->选择帖子->发布->现在在企业列表页面上显示列表。此处的示例： http://bit.ly/1vwydDl （页面底部）

Currently I have setup the relationship field on the company edit page (directory_listing) instead. It works when doing the following: 1) Related Posts to this business listing -> select a post -> publish - > now displays the list on the business listing page. Example here: http://bit.ly/1vwydDl (bottom of the page)

2）我想从POST编辑页面中选择要在其上显示帖子的公司。我可以毫无问题地通过ACF将该字段放到那里，但要使其真正显示我无法弄清楚的结果。

2) I'd like from the POST edit page select a business which posts will appear on. I can put the field there via ACF no problem but getting it to actually display the results I cannot figure out.

推荐答案

背景信息：

get_field（）具有三个参数：

Background Info:

get_field() has three parameters:

1. $ field_name ：要检索的字段的名称。例如， page_content（必填）


2. $ post_id ：在其中输入您的值的特定帖子ID。 默认为当前帖子ID（不是必需的）。这也可以是选项/分类法/用户/等


3. $ format_value

1. $field_name: the name of the field to be retrieved. eg "page_content" (required)
2. $post_id: Specific post ID where your value was entered. Defaults to current post ID (not required). This can also be options / taxonomies / users / etc
3. $format_value

如果您只关注抓取特定帖子（您知道ID），则该键将是第二个参数（ $ post_id ）。 ACF真的没有什么神奇的。非常简单： meta_value （即列出帖子所绑定的目录）保存到每个帖子（附加到该帖子的 $ post_id ）。

If you were only concerned with grabbing a specific post (of which you knew the ID), the key would be the second parameter ($post_id). There's nothing really magical about ACF. Quite simply: the meta_value (i.e. the directory listing the post is tied to) is saved to each post (attached to that post's $post_id).

但是，在您的情况下，我们不知道我们要获取的帖子的ID。

However, in your case, we don't know the ID of the post(s) we want to get.

如果我们用一个简单的句子解释您想做什么，那么该句子将类似于：

If we explain what you want to do in a simple sentence, that sentence would look something like:

在 directory_listings （自定义帖子类型）页面上显示/获取帖子，该页面的 meta_value 指向该页面。

Show/get posts on a directory_listings (custom post type) page which have a meta_value which points to that page.

很明显，您不能使用 get_field（），因为您的问题与获取字段无关。而是，您需要查找具有特定字段的帖子。 ACF对此有出色的文档。

Obviously, you can't use get_field(), because your problem has nothing to do with "getting a field." Rather, you need to "find the posts that have a specific field." ACF has great documentation on this.

幸运的是，WordPress随附了一个名为 WP_Query 的超棒类，以及一个名为 get_posts（）。因此，回顾一下上面的句子并将其转换为函数，我们想要： get_posts（）其中 meta_key 具有当前 $ post_id 的值。

Luckily for you, WordPress ships with an awesome class called a WP_Query, and a similarly awesome function called get_posts(). So looking back at our sentence above and translating it into a function, we want to: get_posts() where the meta_key has a value of the current $post_id.

或者，更具体地说，在您的 directory_listings 页面上，您将具有以下查询：

Or, more specifically, on your directory_listings page, you'd have the following query:

$related_articles = get_posts(array(
    'post_type' => 'post',
    'meta_query' => array(
        array(
            'key' => 'related_articles', // name of custom field
            'value' => '"' . get_the_ID() . '"',
            'compare' => 'LIKE'
        )
    )
));

if( $related_articles ): 
    foreach( $related_articles as $article ): 

    // Do something to display the articles. Each article is a WP_Post object.
    // Example:

    echo $article->post_title;  // The post title
    echo $article->post_excerpt;  // The excerpt
    echo get_the_post_thumbnail( $article->ID );  // The thumbnail

    endforeach;
endif;

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