Laravel form validation unique using 2 fields

Question

How can I have a unique validation rule on 2 fields?

a. The application should not allow two people to have the same identical first name and last name.

It i

Answer 1

This is an extensive answer to this question and how to create Laravel custom validator generally, you can simply copy and paste, and try to understand later: Step 1: Create a provider app/Providers/CustomValidatorProvider.php

validators as $class) {
            $customValidator = new $class();
            ValidatorFacade::extend($customValidator->getName(), function() use ($customValidator) {
                //set custom error messages on the validator
                func_get_args()[3]->setCustomMessages($customValidator->getCustomErrorMessages());
                return call_user_func_array([$customValidator, "validate"], func_get_args());
            });
            ValidatorFacade::replacer($customValidator->getName(), function() use ($customValidator) {
                return call_user_func_array([$customValidator, "replacer"], func_get_args());
            });
        }
    }

    /**
     * Register the application services.
     *
     * @return void
     */
    public function register() {
        //
    }

}

Step 2: Update your app.php in your config folder config/app.php to include your created provider in the provider array

App\Providers\CustomValidatorProvider::class,

Step 3: Create your custom validator, in my case, I am creating multiple unique fields validator app/Validators/MultipleUniqueValidator.php

name;
    }

    /**
     *
     * @param string $message
     * @param string $attribute
     * @param string $rule
     * @param array $parameters
     * @return string
     */
    public function replacer(string $message, string $attribute, string $rule, array $parameters): string {
        unset($parameters[0]);
        $replacement = implode(", ", $parameters);
        $replacement = str_replace("_", " ", $replacement);
        $replacement = Str::replaceLast(", ", " & ", $replacement);
        $replacement = Str::title($replacement);
        return str_replace(":fields", "$replacement", $message);
    }

    /**
     * 
     * @param string $attribute
     * @param mixed $value
     * @param array $parameters
     * @param Validator $validator
     * @return bool
     * @throws \Exception
     */
    public function validate(string $attribute, $value, array $parameters, Validator $validator): bool {
        $model = new $parameters[0];
        if (!$model instanceof Model) {
            throw new \Exception($parameters[0] . " is not an Eloquent model");
        }
        unset($parameters[0]);
        $this->fields = $parameters;

        $query = $model->query();
        $request = app("request");
        foreach($parameters as $parameter){
            $query->where($parameter, $request->get($parameter));
        }

        return $query->count() == 0;
    }

    /**
     * Custom error messages
     * 
     * @return array
     */
    public function getCustomErrorMessages(): array {
        return [
            $this->getName() => ":fields fields should be unique"
        ];
    }

}

Now you can do this in your request

'ANY_FIELD_CAN_CARRY_IT' => 'required|numeric|multiple_unique:'.YOUR_MODEL_HERE::class.',FIELD_1,FIELD_2,FIELD_3...',