Hi Elliot,
Sorry, I did ask this question before and thought I had the solution. However I’m still searching for the answer.
Let’s say I only have a field name ($field_name), how can I get the field key only from this variable. So not related to a post id or something else.
Tried several things but cannot find the right ‘get’ query.
Thanks!
The “real” answer: go to the Field Group admin page, click the “display field key” button in help dropdown, then copy & paste the key into code.
Maybe closer to the answer you’re looking for:
function acf_field_key($field_name, $post_id = false){
if ( $post_id )
return get_field_reference($field_name, $post_id);
if( !empty($GLOBALS['acf_register_field_group']) ) {
foreach( $GLOBALS['acf_register_field_group'] as $acf ) :
foreach($acf['fields'] as $field) :
if ( $field_name === $field['name'] )
return $field['key'];
endforeach;
endforeach;
}
return $field_name;
}
However, this only works for fields registered with PHP via register_field_group().
Hi,
I’ve been struggling with this for some time, and this is my solution, I guess it’s not perfect, but is working for me.
function get_acf_field_keys( $custom_field_slug = '' ) {
$result = array();
$meta_key_start = 'field_';
$acf_args = array(
'post_type' => 'acf'
);
if ( $custom_field_slug !== '' ) {
$acf_args[ 'name' ] = $custom_field_slug;
}
$acf_query = new WP_Query( $acf_args );
if ( $acf_query->have_posts() ) {
while ( $acf_query->have_posts() ) {
$acf_query->the_post();
$meta_values = get_post_meta( get_the_id() );
foreach ( $meta_values as $meta_key => $meta_value ) {
if ( substr( $meta_key, 0, strlen( $meta_key_start ) ) === $meta_key_start ) {
$meta_value_array = unserialize( $meta_value[0] );
$result[ $meta_value_array['name'] ] = $meta_key;
}
}
}
}
wp_reset_postdata();
if ( empty( $result ) ) {
$result = false;
}
return $result;
}
Basically, I’m using WP_Query to iterate through acf posts (Custom fields) & get the metadata, then filter the metadata starting with ‘field_’ to fill an array using the field name as key and the field key as value, to be used like this:
if ( $field_keys = get_acf_field_keys( 'acf_sample-custom-field' ) ) {
if ( isset( $field_keys[ 'sample_field_name' ] ) ) {
$sample_field_key = $field_keys[ 'sample_field_name' ];
}
}
I hope this is helpful for someone.
There is a much easier solution given that the field exists on a given post, which you already seems to assume with your current code.
$field = get_field_object('listing_type');
$field_key = $field['key'];
Done.
Thank you very much! I did a slight modification in order to be able to retrieve the name or the field key depending what is given, because I needed the exact opposite. I paste it here for future reference to others. Cheers!
function acf_get_field_info( $return = 'name', $field_key, $post_id ) {
global $wpdb;
//choose name
if($return == 'name'){
$acf_fields = $wpdb->get_results( $wpdb->prepare( "SELECT ID,post_parent,post_excerpt FROM $wpdb->posts WHERE post_name=%s AND post_type=%s" , $field_key , 'acf-field' ) );
}elseif($return == 'key'){
$acf_fields = $wpdb->get_results( $wpdb->prepare( "SELECT ID,post_parent,post_name FROM $wpdb->posts WHERE post_excerpt=%s AND post_type=%s" , $field_key , 'acf-field' ) );
}
// get all fields with that name.
switch ( count( $acf_fields ) ) {
case 0: // no such field
return false;
case 1: // just one result.
return $acf_fields[0]->post_excerpt;
}
// result is ambiguous
// get IDs of all field groups for this post
$field_groups_ids = array();
$field_groups = acf_get_field_groups( array(
'post_id' => $post_id,
) );
foreach ( $field_groups as $field_group )
$field_groups_ids[] = $field_group['ID'];
// Check if field is part of one of the field groups
// Return the first one.
foreach ( $acf_fields as $acf_field ) {
if ( in_array($acf_field->post_parent,$field_groups_ids) )
return $acf_field->post_name;
}
return false;
}
So, the issue I have is that get_field_object() returns an empty value when creating a new post.
Also, none of these solutions work correctly if you have the same slug in multiple field collections for different post types.
Really wish ACF has a get_field_info( $post_type, $post_slug );
Why can’t you simply use —
$field = acf_get_field( $field_name );
$field_key = $field['key'];
