PHPLIB-530: Fix missing ns entry for idIndex in collection info

src/Model/CollectionInfoCommandIterator.php

@@ -18,6 +18,7 @@
 namespace MongoDB\Model;
 
 use IteratorIterator;
+use Traversable;
 
 /**
  * CollectionInfoIterator for listCollections command results.
@@ -32,6 +33,19 @@ use IteratorIterator;
  */
 class CollectionInfoCommandIterator extends IteratorIterator implements CollectionInfoIterator
 {
+    /** @var string|null */
+    private $databaseName;
+
+    /**
+     * @param string|null $databaseName
+     */
+    public function __construct(Traversable $iterator, $databaseName = null)
+    {
+        parent::__construct($iterator);
+
+        $this->databaseName = $databaseName;
+    }
+
     /**
      * Return the current element as a CollectionInfo instance.
      *
@@ -41,6 +55,12 @@ class CollectionInfoCommandIterator extends IteratorIterator implements Collecti
      */
     public function current()
     {
-        return new CollectionInfo(parent::current());
+        $info = parent::current();
+
+        if ($this->databaseName !== null && isset($info['idIndex']) && ! isset($info['idIndex']['ns'])) {
+            $info['idIndex']['ns'] = $this->databaseName . '.' . $info['name'];
+        }
+
+        return new CollectionInfo($info);
     }
 }

src/Operation/ListCollections.php

@@ -136,6 +136,6 @@ class ListCollections implements Executable
         $cursor = $server->executeReadCommand($this->databaseName, new Command($cmd), $this->createOptions());
         $cursor->setTypeMap(['root' => 'array', 'document' => 'array']);
 
-        return new CollectionInfoCommandIterator(new CachingIterator($cursor));
+        return new CollectionInfoCommandIterator(new CachingIterator($cursor), $this->databaseName);
     }
 }