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delete(int $id = null, boolean $cascade = true);

Deletes the record identified by $id. By default, also deletes records dependent on the record specified to be deleted.

For example, when deleting a User record that is tied to many Recipe records:

• if $cascade is set to true, the related Recipe records are also deleted if the models dependent-value is set to true.
• if $cascade is set to false, the Recipe records will remain after the User has been deleted.

remove(int $id = null, boolean $cascade = true);

A synonym for delete().

deleteAll(mixed $conditions, $cascade = true, $callbacks = false)

Same as with delete() and remove(), except that deleteAll() deletes all records that match the supplied conditions. The $conditions array should be supplied as an SQL fragment or array.