add nova

nova/src/Http/Requests/LensCountRequest.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace Laravel\Nova\Http\Requests;
+
+use Illuminate\Database\Eloquent\Builder;
+use Laravel\Nova\Exceptions\LensCountException;
+
+class LensCountRequest extends NovaRequest
+{
+    use CountsResources;
+    use InteractsWithLenses;
+
+    /**
+     * Get the count of the lens resources.
+     *
+     * @return int
+     */
+    public function toCount()
+    {
+        return rescue(function () {
+            return $this->toQuery()->toBase()->getCountForPagination();
+        }, 0);
+    }
+
+    /**
+     * Transform the request into a query.
+     *
+     * @return \Illuminate\Database\Eloquent\Builder
+     */
+    public function toQuery()
+    {
+        return tap($this->lens()->query(LensRequest::createFrom($this), $this->newSearchQuery()), function ($query) {
+            if (! $query instanceof Builder) {
+                throw new LensCountException('Lens must return an Eloquent query instance in order to count lens resources.');
+            }
+        });
+    }
+}