Home › Forums › Front-end Issues › Accept only unique values › Reply To: Accept only unique values
Since posting that I’ve leaned some thing, like I don’t need to create a post ID field and hide it. I’ve also refined the function so that I can use the same function for any field where I want to have a unique value, just add it as a filter to any field you want to be unique.
<?php
add_filter('acf/validate_value/name='.$field_name, 'acf_unique_value_field', 10, 4);
function acf_unique_value_field($valid, $value, $field, $input) {
if (!$valid || (!isset($_POST['post_ID']) && !isset($_POST['post_id']))) {
return $valid;
}
if (isset($_POST['post_ID'])) {
$post_id = intval($_POST['post_ID']);
} else {
$post_id = intval($_POST['post_id']);
}
if (!$post_id) {
return $valid;
}
$post_type = get_post_type($post_id);
$field_name = $field['name'];
$args = array(
'post_type' => $post_type,
'post_status' => 'publish, draft, trash',
'post__not_in' => array($post_id),
'meta_query' => array(
array(
'key' => $field_name,
'value' => $value
)
)
);
$query = new WP_Query($args);
if (count($query->posts)){
return 'This Value is not Unique. Please enter a unique '.$field['label'];
}
return true;
}
?>
I did notice an error in your code, this:
'key' => $field['type'],
should be
'key' => $field['name'],
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