feat: rule for categories about equils names

app/Nova/Category.php

@@ -7,6 +7,7 @@
 use Illuminate\Http\Request;
 use Laravel\Nova\Fields\ID;
 use Laravel\Nova\Fields\Text;
+use App\Rules\isNameForCategoryAvaiable;
 use Laravel\Nova\Http\Requests\NovaRequest;
 
 class Category extends Resource
@@ -47,7 +48,7 @@ public function fields(NovaRequest $request)
 
             Text::make('Name')
                 ->sortable()
-                ->rules('required', 'max:255'),
+                ->rules('required', 'max:255', new isNameForCategoryAvaiable),
         ];
     }
 

app/Rules/isNameForCategoryAvaiable.php

+<?php
+
+namespace App\Rules;
+
+use Illuminate\Contracts\Validation\Rule;
+use App\Models\Category;
+
+class isNameForCategoryAvaiable implements Rule
+{
+    /**
+     * Create a new rule instance.
+     *
+     * @return void
+     */
+    public function __construct()
+    {
+        //
+    }
+
+    /**
+     * Determine if the validation rule passes.
+     *
+     * @param  string  $attribute
+     * @param  mixed  $value
+     * @return bool
+     */
+    public function passes($attribute, $value)
+    {
+        $category = Category::where('name', $value)->get();
+        return (count($category) === 0) ? true : false;
+    }
+
+    /**
+     * Get the validation error message.
+     *
+     * @return string
+     */
+    public function message()
+    {
+        return 'Category with this name ia already exists.';
+    }
+}