Sphinx Active Record saving via 'replace' converted into fallback

extensions/sphinx/ActiveRecord.php

@@ -851,7 +851,20 @@ class ActiveRecord extends Model
 			return 0;
 		}
 
+		// Replace is supported only by runtime indexes and necessary only for field update
+		$useReplace = false;
+		$indexSchema = $this->getIndexSchema();
 		if ($this->getIndexSchema()->isRuntime) {
+			foreach ($values as $name => $value) {
+				$columnSchema = $indexSchema->getColumn($name);
+				if ($columnSchema->isField) {
+					$useReplace = true;
+					break;
+				}
+			}
+		}
+
+		if ($useReplace) {
 			$values = array_merge($values, $this->getOldPrimaryKey(true));
 			$command = static::getDb()->createCommand();
 			$command->replace(static::indexName(), $values);

tests/unit/extensions/sphinx/ActiveRecordTest.php

@@ -161,6 +161,16 @@ class ActiveRecordTest extends SphinxTestCase
 		$record2 = RuntimeIndex::find(['id' => 2]);
 		$this->assertEquals(9, $record2->type_id);
 
+		// replace
+		$query = 'replace';
+		$rows = RuntimeIndex::find($query);
+		$this->assertEmpty($rows);
+		$record = RuntimeIndex::find(['id' => 2]);
+		$record->content = 'Test content with ' . $query;
+		$record->save();
+		$rows = RuntimeIndex::find($query);
+		$this->assertNotEmpty($rows);
+
 		// updateAll
 		$pk = ['id' => 2];
 		$ret = RuntimeIndex::updateAll(['type_id' => 55], $pk);