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primaryKey()

Returns the name of the primary key for this model's table. This is determined through database introspection. If composite primary keys have been used, they will both be returned in a list. This function is also aliased as primaryKeys().

Name	Type	Required	Default	Description
position	numeric	No	0	If you are accessing a composite primary key, pass the position of a single key to fetch.

// Get the name of the primary key of the table mapped to the `employee` model (which is the `employees` table by default)
keyName = model("employee").primaryKey();