[9.x] Fix aliasing with cursor pagination (#45188)

* Fix aliasing with cursor pagination

* add testCursorPaginateWithDynamicColumnWithCastInSelectRaw

* Update BuildsQueries.php

Co-authored-by: Taylor Otwell <[email protected]>

Author: maximepvrt

src/Illuminate/Database/Concerns/BuildsQueries.php

@@ -427,10 +427,10 @@ protected function getOriginalColumnNameForCursorPagination($builder, string $pa
 
         if (! is_null($columns)) {
             foreach ($columns as $column) {
-                if (($position = stripos($column, ' as ')) !== false) {
-                    $as = substr($column, $position, 4);
+                if (($position = strripos($column, ' as ')) !== false) {
+                    $original = substr($column, 0, $position);
 
-                    [$original, $alias] = explode($as, $column);
+                    $alias = substr($column, $position + 4);
 
                     if ($parameter === $alias || $builder->getGrammar()->wrap($parameter) === $alias) {
                         return $original;

tests/Database/DatabaseQueryBuilderTest.php

@@ -4632,6 +4632,47 @@ public function testCursorPaginateWithDynamicColumnInSelectRaw()
         ]), $result);
     }
 
+    public function testCursorPaginateWithDynamicColumnWithCastInSelectRaw()
+    {
+        $perPage = 15;
+        $cursorName = 'cursor';
+        $cursor = new Cursor(['test' => 'bar']);
+        $builder = $this->getMockQueryBuilder();
+        $builder->from('foobar')->select('*')->selectRaw('(CAST(CONCAT(firstname, \' \', lastname) as VARCHAR)) as test')->orderBy('test');
+        $builder->shouldReceive('newQuery')->andReturnUsing(function () use ($builder) {
+            return new Builder($builder->connection, $builder->grammar, $builder->processor);
+        });
+
+        $path = 'http://foo.bar?cursor='.$cursor->encode();
+
+        $results = collect([['test' => 'foo'], ['test' => 'bar']]);
+
+        $builder->shouldReceive('get')->once()->andReturnUsing(function () use ($builder, $results) {
+            $this->assertEquals(
+                'select *, (CAST(CONCAT(firstname, \' \', lastname) as VARCHAR)) as test from "foobar" where ((CAST(CONCAT(firstname, \' \', lastname) as VARCHAR)) > ?) order by "test" asc limit 16',
+                $builder->toSql());
+            $this->assertEquals(['bar'], $builder->bindings['where']);
+
+            return $results;
+        });
+
+        CursorPaginator::currentCursorResolver(function () use ($cursor) {
+            return $cursor;
+        });
+
+        Paginator::currentPathResolver(function () use ($path) {
+            return $path;
+        });
+
+        $result = $builder->cursorPaginate();
+
+        $this->assertEquals(new CursorPaginator($results, $perPage, $cursor, [
+            'path' => $path,
+            'cursorName' => $cursorName,
+            'parameters' => ['test'],
+        ]), $result);
+    }
+
     public function testCursorPaginateWithDynamicColumnInSelectSub()
     {
         $perPage = 15;