This method performs the following steps in order:
1. call [[beforeValidate()]] when $runValidation is true. If validation
fails, it will skip the rest of the steps;
2. call [[afterValidate()]] when $runValidation is true.
3. call [[beforeSave()]]. If the method returns false, it will skip the
rest of the steps;
4. save the record into index. If this fails, it will skip the rest of the steps;
5. call [[afterSave()]];
In the above step 1, 2, 3 and 5, events [[EVENT_BEFORE_VALIDATE]],
[[EVENT_BEFORE_UPDATE]], [[EVENT_AFTER_UPDATE]] and [[EVENT_AFTER_VALIDATE]]
will be raised by the corresponding methods.
Only the [[changedAttributes|changed attribute values]] will be saved into database.
For example, to update an article record:
php
$article = Article::findOne($id);
$article->genre_id = $genreId;
$article->group_id = $groupId;
$article->update();
Note that it is possible the update does not affect any row in the table.
In this case, this method will return 0. For this reason, you should use the following
code to check if update() is successful or not:
php
if ($this->update() !== false) {
update successful
} else {
update failed
}