[11.x] Rename Model::$collection to $collectionClass

src/Illuminate/Database/Eloquent/HasCollection.php

@@ -15,6 +15,6 @@ trait HasCollection
      */
     public function newCollection(array $models = [])
     {
-        return new static::$collection($models);
+        return new static::$collectionClass($models);
     }
 }

src/Illuminate/Database/Eloquent/Model.php

@@ -225,7 +225,7 @@ abstract class Model implements Arrayable, ArrayAccess, CanBeEscapedWhenCastToSt
      *
      * @var class-string<\Illuminate\Database\Eloquent\Collection<*, *>>
      */
-    protected static string $collection = Collection::class;
+    protected static string $collectionClass = Collection::class;
 
     /**
      * The name of the "created at" column.

src/Illuminate/Notifications/DatabaseNotification.php

@@ -52,7 +52,7 @@ class DatabaseNotification extends Model
     /**
      * The type of collection that should be used for the model.
      */
-    protected static string $collection = DatabaseNotificationCollection::class;
+    protected static string $collectionClass = DatabaseNotificationCollection::class;
 
     /**
      * Get the notifiable entity that the notification belongs to.

types/Database/Eloquent/Model.php

@@ -46,7 +46,7 @@ class Post extends Model
     /** @use HasCollection<Posts<array-key, static>> */
     use HasCollection;
 
-    protected static string $collection = Posts::class;
+    protected static string $collectionClass = Posts::class;
 }
 
 /**