laravel validation unique ignore where code example

Example 1: laravel unique validation

unique:table,column,except,idColumn

############## Example : ################

############### For Updating  
//rules
'email' => 'unique:users,email_address,' . $userId,

############### For Creating 
//rules
'email' => 'unique:users,email_address',

Example 2: laravel rule unique where

'required|email|unique:company_users,email_address,NULL,id,company_id,' . $request->company_id