/** * Sets the custom field data for a specified context and field. * * @param object $context the context to set the data for * @param field $field the field object to set the data for * @param mixed $data a single value or an array depending on whether * $field is multivalued or not * @param string $plugin * @return boolean whether or not the data was modified */ public static function set_for_context_and_field($context, field $field, $data) { global $DB; $data = $field->cast_data($data); // ELIS-3829 if ($context) { $contextid = $context->id; } else { $contextid = null; } $data_table = $field->data_table(); // FIXME: check exclude, unique, etc if ($field->multivalued) { if (!is_array($data)) { $data = array($data); } // find what data already exists (excluding default value if we have a context, including if we don't) $include_default = is_null($contextid) ? true : false; $records = self::get_for_context_and_field($context, $field, $include_default); $records = $records ? $records : array(); $todelete = array(); $existing = array(); foreach ($records as $rec) { $val = $field->cast_to_type($rec->data); if (in_array($val, $data)) { $existing[] = $val; } else { $todelete[] = $rec; } } // delete obsolete data foreach ($todelete as $rec) { $rec->delete(); } // add new data $toadd = array_diff($data, $existing); foreach ($toadd as $value) { $fielddatatype = "field_data_{$field->data_type()}"; $rec = new $fielddatatype(); $rec->contextid = $contextid; $rec->fieldid = $field->id; $rec->data = $value; $rec->save(); } return !empty($toadd) || !empty($todelete); } else { if ($rec = $DB->get_record($data_table, array('contextid' => $contextid, 'fieldid' => $field->id))) { // $fielddata = new field_data($rec, $field->data_type()); $fielddatatype = "field_data_{$field->data_type()}"; $fielddata = new $fielddatatype($rec); if ($data === null) { $fielddata->delete(); return true; } if ($fielddata->data == $data) { return false; } $fielddata->contextid = $contextid; // needed, or else NULL becomes 0 $fielddata->data = $data; $fielddata->save(); return true; } else { if ($data !== null) { $fielddatatype = "field_data_{$field->data_type()}"; $rec = new $fielddatatype(); $rec->contextid = $contextid; $rec->fieldid = $field->id; $rec->data = $data; $rec->save(); return true; } } } }