unique rule with condition

Unique rule takes a max of 4 parameters. You're sending 6.

unique:table,column,except,idColumn

How can I check during the registry that there is no duplicate employee?

If that's exactly what you're trying to do, then it would just be unique:users?

A username can be double, but only in another company (another table)

Oh, I think it would be

'unique:users,username,' . $this->user->units->first()->company_id . ',company_id'

which would validate unique usernames except where company_id = $this->user->units->first()->company_id

You can scope the unique constraint using a Rule:

'username' => [
    'required'
    'string',
    'max' => 255,
    'username' => Rule::unique('users')->where(function ($query) {
        return $query->where('company_id', $this->user->units->first()->company_id);
    });
});

@Cronix I need equal to company_id.

This is the DB chart

https://i.imgur.com/2Xh2YLQ.png

https://i.imgur.com/aSDriKF.png

@tykus I'm using a request.

@tykus I'm using a request.

The example I gave works in a Form Request.

What about a check against another table?