How to use oEmbeds on Post Content during AJAX requests

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Actually this was quite easy – when you know what’s missing: The current post ID for the global $wp_embed object, so it knows what to refer to. The reason is simple: oEmbeds get cached as post meta data, so without knowing the ID, the MarkUp can’t get fetched and replaced in the content.

// grab a post from the database

/** @var \WP_Embed $wp_embed */
global $wp_embed;

/** @var \WP_Post $post; */
// Add the fetched posts ID and add it to the global object
$wp_embed->post_ID = $post->ID;

// Execute the  shortcode
$wp_embed->run_shortcode( $post->post_content );

// Execute the oEmbed handlers for plain links on the own line
$wp_embed->autoembed( $post->post_content );

That’s it.

More in depth info about oEmbed and caching can be found in a related answer by @birgire.

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