php - Problems updating nested ACF field groups

admin2025-01-08 4

I have a frontend form for creating custom posts that accepts data for all ACF associated with that post type. On submission of the form, I am successfully able to create the new post along with pushing normal ACF fields values.

The problem is with the 'Group' ACF field called 'Working Hours' which further has 7 Groups inside it, each named after every day of the week: 'Monday', 'Tuesday'... And each day group contains 2 text fields: am, pm, and a third checkbox called 'closed' which the member will select if that is a weekly off. So it is like this:

#Working Hours( Group )#
-------##Monday ( Group )##
------------ ###am (text)###
------------ ###pm (text)###
------------ ###closed (checkbox)###

I am getting an error undefined index: sub_fields...
And this is my code that I am trying to update the fields:

// Grabbing the Working Hours Group field
$hours = get_field( 'field_61f453c010074', $post_id );

foreach ( $hours['sub_fields'] as $key => $value ) { // error in sub_fields in this line
    foreach ( $value['sub_fields'] as $timing ) {
        $timing[0] = $_POST['field_61f4573589282'];// am
        $timing[1] = $_POST['field_61f4574589283'];// pm
        $timing[2] = $_POST['field_61f7a28ffbcef'];// 'Closed' checkbox
    }
}

update_field( 'field_61f453c010074', $value, $post_id ); // error here too value is undefined

This is how the Working Hours Group field is printed. Here, I have posted the data returned for the parent group, as well as taken only the first child for sample i.e. Monday:

#Working Hours( Group )#
-------##Monday ( Group )##
------------ ###am (text)###
------------ ###pm (text)###
------------ ###closed (checkbox)###

I am getting an error undefined index: sub_fields...
And this is my code that I am trying to update the fields:

// Grabbing the Working Hours Group field
$hours = get_field( 'field_61f453c010074', $post_id );

foreach ( $hours['sub_fields'] as $key => $value ) { // error in sub_fields in this line
    foreach ( $value['sub_fields'] as $timing ) {
        $timing[0] = $_POST['field_61f4573589282'];// am
        $timing[1] = $_POST['field_61f4574589283'];// pm
        $timing[2] = $_POST['field_61f7a28ffbcef'];// 'Closed' checkbox
    }
}

update_field( 'field_61f453c010074', $value, $post_id ); // error here too value is undefined

This is how the Working Hours Group field is printed. Here, I have posted the data returned for the parent group, as well as taken only the first child for sample i.e. Monday:

Share Improve this question asked Feb 1, 2022 at 21:30 Mr.Coder 1112 bronze badges

having the same issue, but for a repeater field. if I add the output to a debug textarea, it works as expected... I've tried get_field_object(), have_rows(), reset_rows() etc, but as soon as I try to use the values assigned to variables, it breaks both the field group and the display... – Sandra Commented Mar 31, 2022 at 16:29

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1 Answer 1

Sorted by: Reset to default 0

I came here looking for an answer to this same error.

I resolved the issue by wrapping my functionality into a function and adding it to the init action.

Here is an example based on above code sample, where get_field() does NOT throw the undefined index: sub_fields... error.

add_action( 'init', 'wpse_402110', 10 );

function wpse_402110(){

  // Grabbing the Working Hours Group field
  $hours = get_field( 'field_61f453c010074', $post_id );

  foreach ( $hours['sub_fields'] as $key => $value ) { // error in sub_fields in this line
      foreach ( $value['sub_fields'] as $timing ) {
        $timing[0] = $_POST['field_61f4573589282'];// am
        $timing[1] = $_POST['field_61f4574589283'];// pm
        $timing[2] = $_POST['field_61f7a28ffbcef'];// 'Closed' checkbox
      }
  }

  update_field( 'field_61f453c010074', $value, $post_id ); // error here too value is undefined

}

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phpProblems updating nested ACF field groups

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