method
delete_if
![Some documentation Importance_1](https://d2vfyqvduarcvs.cloudfront.net/images/importance_1.png?1349367920)
delete_if()
public
Calls the given block once for each key, value pair in the database. Deletes all entries for which the block returns true.
Returns self.
delete_if()
public
Calls the given block once for each key, value pair in the database. Deletes all entries for which the block returns true.
Returns self.