Faced an interesting problem when maintaining a Drupal site. It occurs in all versions of Drupal. Problem: It is possible to create an object labelled "0". However, this object will be ignored by the autocomplete object form element.
See here for a description of the problem and patchesSolution
Create a new term named "0". Select any type of node and configure a new field that references the terms. Install any autofill widget for this field. Select any node of this type and open the edit form. Enter "0" in the field — there will be no suggestions for autofill. After saving the node, the field will remain empty. However, if you enter "0" (separated by a space), the value of the field will be saved correctly.
Do not use empty()
to check the value of a form element. Don't use (bool)
cast to check the entered string from the URL.
Correction for terms without a kernel patch (Drupal 7).
/**
* Implements hook_field_widget_WIDGET_TYPE_form_alter().
*/
function custom_field_widget_taxonomy_autocomplete_form_alter(&$element, &$form_state, $context) {
array_unshift($element['#element_validate'], 'custom_taxonomy_autocomplete_validate');
}
/**
* Form element validate handler for taxonomy term autocomplete element.
*
* @param array $element
* The element structure.
*/
function custom_taxonomy_autocomplete_validate(array &$element) {
// Fix for single term with name "0".
if ($element['#value'] === '0') {
$element['#value'] .= ' ';
}
}
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