The problem is we also have an “edit” possibility for not logined users by some “hidden key value” which they receive through email.
The post_id is then selected and given to the acf_form object
acf_form(array(
'id' => 'acf-form',
/* (int|string) The post ID to load data from and save data to. Defaults to the current post ID.
Can also be set to 'new_post' to create a new post on submit */
'post_id' => $post_id,
...
Sadly in the called filters function for select field the value is always “null” even When the priority is set to 1 / 10 / 20 / 1000.
A quick look into the source code even shows me that even in the filter ‘acf/pre_render_fields’ the values aren’t set….
from acf_field_functions.php
/**
* acf_render_fields
*
* Renders an array of fields. Also loads the field's value.
*
* @date 8/10/13
* @since 5.0.0
* @since 5.6.9 Changed parameter order.
*
* @param array $fields An array of fields.
* @param (int|string) $post_id The post ID to load values from.
* @param string $element The wrapping element type.
* @param string $instruction The instruction render position (label|field).
* @return void
*/
function acf_render_fields( $fields, $post_id = 0, $el = 'div', $instruction = 'label' ) {
// Parameter order changed in ACF 5.6.9.
if( is_array($post_id) ) {
$args = func_get_args();
$fields = $args[1];
$post_id = $args[0];
}
/**
* Filters the $fields array before they are rendered.
*
* @date 12/02/2014
* @since 5.0.0
*
* @param array $fields An array of fields.
* @param (int|string) $post_id The post ID to load values from.
*/
$fields = apply_filters( 'acf/pre_render_fields', $fields, $post_id );
// Filter our false results.
$fields = array_filter( $fields );
// Loop over and render fields.
if( $fields ) {
foreach( $fields as $field ) {
// Load value if not already loaded.
if( $field['value'] === null ) {
$field['value'] = acf_get_value( $post_id, $field );
}
// Render wrap.
acf_render_field_wrap( $field, $el, $instruction );
}
}
/**
* Fires after fields have been rendered.
*
* @date 12/02/2014
* @since 5.0.0
*
* @param array $fields An array of fields.
* @param (int|string) $post_id The post ID to load values from.
*/
do_action( 'acf/render_fields', $fields, $post_id );
}
the filter add_filter('acf/load_field/name=myselect'.. is called by far before the actual render of the select field and sadly also way before the value is set.
So your code doesn’t work.
