How validate unique email out of the user that is updating it in Laravel?

You can tell that to validators:

'email' => 'unique:users,email_address,'.$user->id

Check the docs, in section 'Forcing A Unique Rule To Ignore A Given ID'.

In Request Class you will probably need this validation in PUT or PATCH method where you don't have user then you can simply use this rule

 You have 2 options to do this

1:

 'email' => "unique:users,email,$this->id,id"

OR

2:

 use Illuminate\Validation\Rule; //import Rule class 'email' => Rule::unique('users')->ignore($this->id); //use it in PUT or PATCH method

$this->id is providing id of the user because $this is object of Request Class and Request also contains user object.

public function rules(){    switch ($this->method()) {        case 'POST':        {            return [                'name' => 'required',                'email' => 'required|email|unique:users',                'password' => 'required'            ];        }        case 'PUT':        case 'PATCH':        {            return [                'name' => 'required',                'email' => "unique:users,email,$this->id,id",                                   OR                //below way will only work in Laravel ^5.5                 'email' => Rule::unique('users')->ignore($this->id),               //Sometimes you dont have id in $this object               //then you can use route method to get object of model                //and then get the id or slug whatever you want like below:              'email' => Rule::unique('users')->ignore($this->route()->user->id),            ];        }        default: break;    }}

Hope it will solve the problem while using request class.

For coders using FormRequest & Laravel 5.7 and facing this problem, you can do something like this

public function rules() {    return [        'email' => ['required', 'string', 'email', 'max:255',            Rule::unique('users')->ignore($this->user),        ],    ];}

The $this->user will return the user ID coming from the request.