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Each table normally has a primary key, id. You may change which field name the model uses as its primary key. This is common when setting CakePHP to use an existing database table.

Example usage:

class Example extends AppModel {
    var $primaryKey = 'example_id'; // example_id is the field name in the database
}

1. class Example extends AppModel {
2. var $primaryKey = 'example_id'; // example_id is the field name in the database
3. }