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app/Nova/Resources/System/Settings/Location/Province/Filters/RegionFilter.php

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+<?php
+
+namespace App\Nova\Resources\System\Settings\Location\Province\Filters;
+
+use App\Models\System\Settings\Location\Region;
+use Laravel\Nova\Filters\Filter;
+use Laravel\Nova\Http\Requests\NovaRequest;
+
+class RegionFilter extends Filter
+{
+    /**
+     * The filter's component.
+     *
+     * @var string
+     */
+    public $component = 'select-filter';
+
+    /**
+     * Apply the filter to the given query.
+     *
+     * @param  \Illuminate\Database\Eloquent\Builder  $query
+     * @param  mixed  $value
+     * @return \Illuminate\Database\Eloquent\Builder
+     */
+    public function apply(NovaRequest $request, $query, $value)
+    {
+        return $value
+            ? $query->where('region', $value)
+            : $query;
+    }
+
+    /**
+     * Get the filter's available options.
+     *
+     * @return array
+     */
+    public function options(NovaRequest $request)
+    {
+        return array_flip(Region::values());
+    }
+}

app/Nova/Resources/System/Settings/Location/Province/Province.php

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+<?php
+
+namespace App\Nova\Resources\System\Settings\Location\Province;
+
+use App\Models\System\Settings\Location\Province as ProvinceModel;
+use App\Models\System\Settings\Location\Region;
+use App\Nova\Resource;
+use Laravel\Nova\Fields\ID;
+use Laravel\Nova\Fields\Select;
+use Laravel\Nova\Fields\Text;
+use Laravel\Nova\Http\Requests\NovaRequest;
+
+class Province extends Resource
+{
+    /**
+     * The model the resource corresponds to.
+     *
+     * @var class-string<\App\Models\Resources\System\Settings\Location\Province\Province>
+     */
+    public static $model = ProvinceModel::class;
+
+    /**
+     * The single value that should be used to represent the resource when being displayed.
+     *
+     * @var string
+     */
+    public static $title = 'name';
+
+    /**
+     * The columns that should be searched.
+     *
+     * @var array
+     */
+    public static $search = [
+        'id', 'name',
+    ];
+
+    /**
+     * Get the displayable label of the resource.
+     */
+    public static function label(): string
+    {
+        return __('Provinces');
+    }
+
+    /**
+     * Get the displayable singular label of the resource.
+     */
+    public static function singularLabel(): string
+    {
+        return __('Province');
+    }
+
+    /**
+     * Get the fields displayed by the resource.
+     */
+    public function fields(NovaRequest $request): array
+    {
+        return [
+            ID::make()->sortable(),
+
+            Select::make(__('Region'), 'region')
+                ->displayUsingLabels()
+                ->searchable()
+                ->options(Region::values())
+                ->default(Region::AG)
+                ->rules('required')
+                ->sortable(),
+
+            Text::make(__('Name'), 'name')
+                ->rules('required', 'string', 'max:255')
+                ->translatable()
+                ->sortable(),
+        ];
+    }
+
+    /**
+     * Get the filters available for the resource.
+     */
+    public function filters(NovaRequest $request): array
+    {
+        return [
+            new Filters\RegionFilter(),
+        ];
+    }
+}