Add EmptyNameValidator and ItemValidatorByName.

app/Models/Validation/Validators/EmptyNameValidator.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Models\Validation\Validators;
+
+use App\Models\Validation\Validators\Validator;
+
+class EmptyNameValidator extends Validator {
+    private string $name;
+    protected Validator $nextValidator;
+
+    public function __construct(string $name, Validator $nextValidator)
+    {
+        $this->name = $name;
+        $this->nextValidator = $nextValidator;
+    }
+
+    public function isCurrentValid(): bool
+    {
+        return $this->name != "";
+    }
+}

app/Models/Validation/Validators/ItemValidatorByName.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace App\Models\Validation\Validators;
+
+use App\Models\Validation\Validators\Validator;
+use App\Models\Item;
+
+class ItemValidatorByName extends Validator {
+    private string $name;
+    protected Validator $nextValidator;
+
+    public function __construct(string $name, Validator $nextValidator)
+    {
+        $this->name = $name;
+        $this->nextValidator = $nextValidator;
+    }
+
+    public function isCurrentValid(): bool
+    {
+        $count = Item::where('name', $this->name)->count();
+
+        return $count != 0;
+    }
+}
+