Automatically assign a Wordpress Custom Taxonomy Term to all posts in a Custom Post Type

Hello,

I have a custom post type on a wordpress site with many posts in. I have created a new Taxonomy and I need to assign one of the Terms of that taxonomy to all posts in a Custom Post Type. The taxonomy is registered to that CPT and I could do this manually but there are loads so would take forever.

I think something with wp_set_object_terms should do it but I'm not sure.

So I want to be able to set this term to update all existing posts within a custom post type, and also make sure that any new posts in that CPT are automatically tagged with this taxonomy theme.

This taxonomy has several terms and I would want to assign one term to each of several CPTs in my site automatically. All CPTs are registered with the taxonomy.

Can anyone help please?

Thanks!
igloobobAsked:
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igloobobAuthor Commented:
Just realised there's a batch update in the CPT list page so I've updated all existing posts now.

So what I need is to set up so that any new posts in that CPT are automatically tagged with this taxonomy theme rather than having to rely on admin remembering to add the term manually each time.
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eemitCommented:
// Try this in your child theme's functions.php
// NOTE: test this in your dev or test environment first
add_action( 'save_post', 'yourprefix_set_default_object_terms', 11, 2 );
function yourprefix_set_default_object_terms( $post_id, $post ) {
	if ( 'publish' === $post->post_status ) {
		// Change here your custom taxonomy slugs and term slugs
		$defaults = array(
			'your_taxonomy_1_slug' => array( 'term1', 'term2' ),
			'your_taxonomy_2_slug' => array( 'termA', 'termB' )
		);
		$taxonomies = get_object_taxonomies( $post->post_type );
		foreach ( (array) $taxonomies as $taxonomy ) {
			$terms = wp_get_post_terms( $post_id, $taxonomy );
			$append = ! empty( $terms );

			if ( array_key_exists( $taxonomy, $defaults ) ) {
				// usage: wp_set_object_terms( $object_id, $terms, $taxonomy, $append );
				$term_taxonomy_ids = wp_set_object_terms( $post_id, $defaults[$taxonomy], $taxonomy, $append );

				if ( is_wp_error( $term_taxonomy_ids ) ) {
					// There was an error somewhere and the terms couldn't be set.
				} else {
					// Success! These terms were added to the post.
				}					
			}
		}
	}
}

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igloobobAuthor Commented:
Hello.

I am so sorry I never replied to this. Someone else took over the job and I'll be honest I completely forgot about this thread.

Anyway, I'm just doing some housekeeping on my account so just had a look at this. I gave it a go on a dev site just to test it for future reference.

I added a custom post type called 'houses'. And a taxonomy called 'house-type' with the terms 'detached' and semi-detatched'.

It doesn't seem to work for me, though I have probably done something wrong. Is there somewhere in this code I am supposed to enter the Custom Post Type name that the taxonomy is for? Is that what I am missing I wonder?

add_action( 'save_post', 'myprefix_set_default_object_terms', 11, 2 );
function myprefix_set_default_object_terms( $post_id, $post ) {
	if ( 'publish' === $post->post_status ) {
		// Change here your custom taxonomy slugs and term slugs
		$defaults = array(
			'house-types' => array( 'semi-detached', 'detached' )
		);
		$taxonomies = get_object_taxonomies( $post->post_type );
		foreach ( (array) $taxonomies as $taxonomy ) {
			$terms = wp_get_post_terms( $post_id, $taxonomy );
			$append = ! empty( $terms );

			if ( array_key_exists( $taxonomy, $defaults ) ) {
				// usage: wp_set_object_terms( $object_id, $terms, $taxonomy, $append );
				$term_taxonomy_ids = wp_set_object_terms( $post_id, $defaults[$taxonomy], $taxonomy, $append );

				if ( is_wp_error( $term_taxonomy_ids ) ) {
					// There was an error somewhere and the terms couldn't be set.
				} else {
					// Success! These terms were added to the post.
				}					
			}
		}
	}
}

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Again, many apologies for my rudeness in forgetting this thread.
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eemitCommented:
Hi igloobob,
here works well.
Any new posts in that CPT are automatically tagged with these taxonomy terms.
Note that this works only by saving your CPT.
You can also use another version of 'save_post' action: save_post_{$post->post_type}
so instead of:
add_action( 'save_post', 'myprefix_set_default_object_terms', 11, 2 );

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Use this:
add_action( 'save_post_houses', 'myprefix_set_default_object_terms', 11, 2 );

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eemitCommented:
Also try to change your taxonomy slug called 'house-type' to 'house_type'
It should only contain lowercase letters and the underscore character.
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igloobobAuthor Commented:
thanks eemit, will have a go with this later on today and report back
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igloobobAuthor Commented:
just had a play and it works great, thanks!
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