add nova

nova/src/Http/Requests/CountsResources.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace Laravel\Nova\Http\Requests;
+
+trait CountsResources
+{
+    /**
+     * Build a new count query for the given query.
+     *
+     * @param  \Illuminate\Database\Eloquent\Builder  $query
+     * @return \Illuminate\Database\Query\Builder
+     */
+    public function buildCountQuery($query)
+    {
+        $baseQuery = $query->toBase();
+
+        if (empty($baseQuery->groups)) {
+            return $baseQuery;
+        }
+
+        $subQuery = $baseQuery->cloneWithout(
+            $baseQuery->unions ? ['orders', 'limit', 'offset'] : ['columns', 'orders', 'limit', 'offset']
+        )->cloneWithoutBindings(
+            $baseQuery->unions ? ['order'] : ['select', 'order']
+        )->selectRaw('1 as exists_temp');
+
+        return $query->getConnection()
+            ->query()
+            ->fromSub($subQuery, 'count_temp');
+    }
+}