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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 (User 'hasMany' or 'hasAndBelongsToMany' Recipes):

• 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.

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.

conditions Conditions to match
cascade Boolean, Set to true to delete records that depend on this record. Note that you will need to set dependent to true in the relevant model associations
callbacks Boolean, Run callbacks

Return boolean True on success, false on failure