/**
* Sets the custom field data for a specified context and field.
*
* @param object $context
* @param object $field
* @param mixed $data a single value or an array depending on whether
* $field is multivalued or not
* @param string $plugin
* @return boolean whether or not the data was modified
*/
static function set_for_context_and_field($context, $field, $data)
{
global $CURMAN;
if ($context) {
$contextid = $context->id;
} else {
$contextid = NULL;
}
$data_table = $field->data_table();
// FIXME: check exclude, unique, etc
if ($field->multivalued) {
$records = field_data::get_for_context_and_field($context, $field);
$records = $records ? $records : array();
$todelete = array();
$toadd = array();
$existing = array();
foreach ($records as $rec) {
if (in_array($rec->data, $data)) {
$existing[] = $rec->data;
} else {
$todelete[] = $rec;
}
}
if (is_array($data)) {
$toadd = array_diff($data, $existing);
}
foreach ($todelete as $rec) {
$CURMAN->db->delete_records($data_table, 'id', $rec->id);
}
foreach ($toadd as $value) {
$rec = new field_data(false, $field->data_type());
$rec->contextid = $contextid;
$rec->fieldid = $field->id;
$rec->data = $value;
$rec->data_insert_record();
}
return !empty($toadd) || !empty($todelete);
} else {
if ($rec = $CURMAN->db->get_record($data_table, 'contextid', $contextid, 'fieldid', $field->id)) {
$fielddata = new field_data($rec, $field->data_type());
if ($data === NULL) {
$fielddata->delete();
return true;
}
if (addslashes($fielddata->data) == $data) {
return false;
}
$fielddata->contextid = $contextid;
// needed, or else NULL becomes 0
$fielddata->data = $data;
$fielddata->update();
return true;
} elseif ($data !== NULL) {
$rec = new field_data(false, $field->data_type());
$rec->contextid = $contextid;
$rec->fieldid = $field->id;
$rec->data = $data;
$rec->add();
return true;
}
}
}
