php - using unique rule of laravel 4 on updating database records -

i have table weapons have columns weaponid, weaponname, wstock, wdesc

in update function inside controller, have set of rules

public function c_updatesystemuser($id) {     $rules = array(             'weaponname'  => 'required|min:2|max:50|regex:/^[a-za-z0-9\-\s]+$/|unique:weapontbl,weaponname,' . $id,             'wstock'      => 'required|numeric',             'wdesc'       => 'required|min:1|max:100|regex:/^[a-za-z0-9\-\s]+$/'           );     //other stuff } 

when updated , changed wstock having problems because saying weaponname existed. used unique rule

unique:weapontbl,weaponname,' . $id, 

because wanted except record im working on when tested i'am having these errors

column not found: 1054 unknown column 'id' in 'where clause' (sql: select count(*) aggregate `weapontbl` `weaponname` = unicorn , `id` <> 1) 

why using id whereas don't have 'id' in table weaponid? there way work around this?

inside weapon class need change primary key:

class weapon extends eloquent {      protected $primarykey = 'weaponid';  } 

and change unique rule to:

unique:weapontbl,weaponname,' . $id . ',weaponid'