Set primary key when model's $useAutoIncrecement = false;

To be safe with databases we always have a Primary Key:

Code:

id int(11) UNSIGNED NOT NULL AUTOINCREMENT

Change the name of your Key to something that it reflects.
Then just add your fields to the table, your key would be just a UNIQUE KEY
In CodeIgniter set the Primary Key to id.
You should always have a Primary Key like below.

Code:

id int(11) UNSIGNED NOT NULL AUTOINCREMENT

dd

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