add support for multiple items

config/sets/typed-collections-docblocks.php

@@ -2,8 +2,8 @@
 
 declare(strict_types=1);
 
-use Rector\Doctrine\TypedCollections\Rector\ClassMethod\CollectionDocblockGenericTypeRector;
 use Rector\Config\RectorConfig;
+use Rector\Doctrine\TypedCollections\Rector\ClassMethod\CollectionDocblockGenericTypeRector;
 
 return static function (RectorConfig $rectorConfig): void {
     $rectorConfig->rules([

rules-tests/TypedCollections/Rector/ClassMethod/CollectionDocblockGenericTypeRector/Fixture/multiple_items_added.php.inc

@@ -0,0 +1,52 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Doctrine\Tests\TypedCollections\Rector\ClassMethod\CollectionDocblockGenericTypeRector\Fixture;
+
+use Doctrine\Common\Collections\Collection;
+use Doctrine\Common\Collections\ArrayCollection;
+use Rector\Doctrine\Tests\TypedCollections\Rector\ClassMethod\CollectionDocblockGenericTypeRector\Source\RandomHouse;
+
+final class MultipleItemsAdded
+{
+    public function getItems(): Collection
+    {
+        $collection = new ArrayCollection();
+        $collection->add(new RandomHouse());
+
+        $collection->add(new RandomHouse());
+
+        return $collection;
+    }
+}
+
+?>
+-----
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Doctrine\Tests\TypedCollections\Rector\ClassMethod\CollectionDocblockGenericTypeRector\Fixture;
+
+use Doctrine\Common\Collections\Collection;
+use Doctrine\Common\Collections\ArrayCollection;
+use Rector\Doctrine\Tests\TypedCollections\Rector\ClassMethod\CollectionDocblockGenericTypeRector\Source\RandomHouse;
+
+final class MultipleItemsAdded
+{
+    /**
+     * @return \Doctrine\Common\Collections\Collection<int, \Rector\Doctrine\Tests\TypedCollections\Rector\ClassMethod\CollectionDocblockGenericTypeRector\Source\RandomHouse>
+     */
+    public function getItems(): Collection
+    {
+        $collection = new ArrayCollection();
+        $collection->add(new RandomHouse());
+
+        $collection->add(new RandomHouse());
+
+        return $collection;
+    }
+}
+
+?>

rules/TypedCollections/Rector/ClassMethod/CollectionDocblockGenericTypeRector.php

@@ -137,19 +137,7 @@ public function refactor(Node $node): ?ClassMethod
             return null;
         }
 
-        $setTypeClasses = [];
-
-        foreach ($collectionAddMethodCalls as $collectionAddMethodCall) {
-            $setArg = $collectionAddMethodCall->getArgs()[0];
-            $setType = $this->getType($setArg->value);
-
-            if (! isset($setType->getObjectClassNames()[0])) {
-                continue;
-            }
-
-            $setTypeClasses[] = $setType->getObjectClassNames()[0];
-        }
-
+        $setTypeClasses = $this->resolveSetTypeClasses($collectionAddMethodCalls);
         if (count($setTypeClasses) !== 1) {
             return null;
         }
@@ -175,4 +163,26 @@ public function refactor(Node $node): ?ClassMethod
 
         return null;
     }
+
+    /**
+     * @param MethodCall[] $collectionAddMethodCalls
+     * @return string[]
+     */
+    private function resolveSetTypeClasses(array $collectionAddMethodCalls): array
+    {
+        $setTypeClasses = [];
+
+        foreach ($collectionAddMethodCalls as $collectionAddMethodCall) {
+            $setArg = $collectionAddMethodCall->getArgs()[0];
+            $setType = $this->getType($setArg->value);
+
+            if (! isset($setType->getObjectClassNames()[0])) {
+                continue;
+            }
+
+            $setTypeClasses[] = $setType->getObjectClassNames()[0];
+        }
+
+        return array_unique($setTypeClasses);
+    }
 }