make sure $column is string

src/Query/Builder.php

@@ -625,7 +625,7 @@ public function update(array $values, array $options = [])
      */
     public function increment($column, $amount = 1, array $extra = [], array $options = [])
     {
-        $query = ['$inc' => [$column => $amount]];
+        $query = ['$inc' => [(string) $column => $amount]];
 
         if (! empty($extra)) {
             $query['$set'] = $extra;
@@ -797,9 +797,9 @@ public function push($column, $value = null, $unique = false)
             }
             $query = [$operator => $column];
         } elseif ($batch) {
-            $query = [$operator => [$column => ['$each' => $value]]];
+            $query = [$operator => [(string) $column => ['$each' => $value]]];
         } else {
-            $query = [$operator => [$column => $value]];
+            $query = [$operator => [(string) $column => $value]];
         }
 
         return $this->performUpdate($query);
@@ -1004,8 +1004,14 @@ protected function compileWheres(): array
                 $where['boolean'] = 'or'.(str_ends_with($where['boolean'], 'not') ? ' not' : '');
             }
 
+            // Column name can be a Stringable object.
+            if (isset($where['column']) && $where['column'] instanceof \Stringable) {
+                $where['column'] = (string) $where['column'];
+            }
+
             // We use different methods to compile different wheres.
             $method = "compileWhere{$where['type']}";
+
             $result = $this->{$method}($where);
 
             if (str_ends_with($where['boolean'], 'not')) {

tests/QueryBuilderTest.php

@@ -9,6 +9,7 @@
 use Illuminate\Support\Facades\Date;
 use Illuminate\Support\Facades\DB;
 use Illuminate\Support\LazyCollection;
+use Illuminate\Support\Str;
 use Illuminate\Testing\Assert;
 use MongoDB\BSON\ObjectId;
 use MongoDB\BSON\Regex;
@@ -895,4 +896,64 @@ public function testCursor()
             $this->assertEquals($data[$i]['name'], $result['name']);
         }
     }
+
+    public function testStringableColumn()
+    {
+        DB::collection('users')->insert([
+            ['name' => 'Jane Doe', 'age' => 36, 'birthday' => new UTCDateTime(new \DateTime('1987-01-01 00:00:00'))],
+            ['name' => 'John Doe', 'age' => 28, 'birthday' => new UTCDateTime(new \DateTime('1995-01-01 00:00:00'))],
+        ]);
+
+        $nameColumn = Str::of('name');
+        $this->assertInstanceOf(\Stringable::class, $nameColumn, 'Ensure we are testing the feature with a Stringable instance');
+
+        $user = DB::collection('users')->where($nameColumn, 'John Doe')->first();
+        $this->assertEquals('John Doe', $user['name']);
+
+        // Test this other document to be sure this is not a random success to data order
+        $user = DB::collection('users')->where($nameColumn, 'Jane Doe')->orderBy('natural')->first();
+        $this->assertEquals('Jane Doe', $user['name']);
+
+        // With an operator
+        $user = DB::collection('users')->where($nameColumn, '!=', 'Jane Doe')->first();
+        $this->assertEquals('John Doe', $user['name']);
+
+        // whereIn and whereNotIn
+        $user = DB::collection('users')->whereIn($nameColumn, ['John Doe'])->first();
+        $this->assertEquals('John Doe', $user['name']);
+
+        $user = DB::collection('users')->whereNotIn($nameColumn, ['John Doe'])->first();
+        $this->assertEquals('Jane Doe', $user['name']);
+
+        // whereBetween and whereNotBetween
+        $ageColumn = Str::of('age');
+        $user = DB::collection('users')->whereBetween($ageColumn, [30, 40])->first();
+        $this->assertEquals('Jane Doe', $user['name']);
+
+        // whereBetween and whereNotBetween
+        $ageColumn = Str::of('age');
+        $user = DB::collection('users')->whereNotBetween($ageColumn, [30, 40])->first();
+        $this->assertEquals('John Doe', $user['name']);
+
+        // whereDate
+        $birthdayColumn = Str::of('birthday');
+        $user = DB::collection('users')->whereDate($birthdayColumn, '1995-01-01')->first();
+        $this->assertEquals('John Doe', $user['name']);
+
+        $user = DB::collection('users')->whereDate($birthdayColumn, '<', '1990-01-01')
+            ->orderBy($birthdayColumn, 'desc')->first();
+        $this->assertEquals('Jane Doe', $user['name']);
+
+        $user = DB::collection('users')->whereDate($birthdayColumn, '>', '1990-01-01')
+            ->orderBy($birthdayColumn, 'asc')->first();
+        $this->assertEquals('John Doe', $user['name']);
+
+        $user = DB::collection('users')->whereDate($birthdayColumn, '!=', '1987-01-01')->first();
+        $this->assertEquals('John Doe', $user['name']);
+
+        // increment
+        DB::collection('users')->where($ageColumn, 28)->increment($ageColumn, 1);
+        $user = DB::collection('users')->where($ageColumn, 29)->first();
+        $this->assertEquals('John Doe', $user['name']);
+    }
 }