Adding unique key to rows

This topic has 2 replies, 2 voices, and was last updated 8 years, 10 months ago by Anh Tran.

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January 6, 2016 at 11:02 PM #2055
killwil
Participant
Hello,

I would like to add Unique keys to a text field named row_id in a data group.
This filter is working for the first row but not for the second and others...
Could you help ?
```
add_filter ( 'rwmb_normalize_row_id_field', 'somefunction' );
function somefunction($field) {
	if ($field['std']=='') $field['std'] = uniqid();
	return $field;	
}
```
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January 7, 2016 at 1:47 AM #2056
killwil
Participant
I try with _value filter to save a blank field with a default value but no more luck...
```
add_filter('rwmb_row_id_value', 'rwmb_row_id',10,3);
function rwmb_row_id ( $new, $field, $old )
{
	if ($old == '') $new = uniqid();
    return $new ;
}
```
$old doesn't give me the old value of the field...

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January 10, 2016 at 9:57 AM #2085
Anh Tran
Keymaster
Hi,

This is a hard question :). I think the filter allows you to change the value of whole group, as the group is the actual field you're filtering. So, $old and $new are arrays (of sub-field values). I guess you're using a cloneable group? If so, then $old and $new are arrays (of clones), each clone is an array of sub-fields.

Let's try with the code below:
```
add_filter('rwmb_GROUP_ID_value', 'prefix_change_value',10,3);
function prefix_change_value ( $new, $field, $old )
{
    $text_field_id = 'SUB_FIELD_ID';
    foreach ( $new as $k => $clone )
    {
        $new[$k][$text_field_id] = uniqid();
    }
    return $new;
}
```
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