bug #24448 [Session] fix MongoDb session handler to gc all expired se…

…ssions (Tobion)

This PR was merged into the 2.7 branch.

Discussion
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[Session] fix MongoDb session handler to gc all expired sessions

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | yes
| New feature?  | no <!-- don't forget to update src/**/CHANGELOG.md files -->
| BC breaks?    | no
| Deprecations? | no <!-- don't forget to update UPGRADE-*.md files -->
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

MongoDB session handler `gc` wrongly only deleted one random expired session instead of all of them.
Care when merging to master as this will conflict with #24447

Commits
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e6895bf [Session] fix MongoDb session handler to gc all expired sessions

src/Symfony/Component/HttpFoundation/Session/Storage/Handler/MongoDbSessionHandler.php

@@ -118,7 +118,7 @@ public function destroy($sessionId)
      */
     public function gc($maxlifetime)
     {
-        $methodName = $this->mongo instanceof \MongoDB\Client ? 'deleteOne' : 'remove';
+        $methodName = $this->mongo instanceof \MongoDB\Client ? 'deleteMany' : 'remove';
 
         $this->getCollection()->$methodName(array(
             $this->options['expiry_field'] => array('$lt' => $this->createDateTime()),

src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Handler/MongoDbSessionHandlerTest.php

@@ -291,7 +291,7 @@ public function testGc()
 
         $that = $this;
 
-        $methodName = phpversion('mongodb') ? 'deleteOne' : 'remove';
+        $methodName = phpversion('mongodb') ? 'deleteMany' : 'remove';
 
         $collection->expects($this->once())
             ->method($methodName)