Unique identifier of persistent rows, using Eloquent\Model

[marcellofuschi]

Hi all! Just wanted to see if this would be a desired addition.
Sometimes I needed to do things like removing duplicates from a collection of Eloquent models that come from different tables.

$mixedCollection->unique(fn ($model) => $model->getIdentifierOfPersistentRow());

I thought that the same technique that is used in Model::is can be reused to uniquely identify the DB row represented by the model.

This would make it available:

diff --git a/src/Illuminate/Database/Eloquent/Model.php b/src/Illuminate/Database/Eloquent/Model.php
index 52ad4051d..438deb9c0 100644
--- a/src/Illuminate/Database/Eloquent/Model.php
+++ b/src/Illuminate/Database/Eloquent/Model.php
@@ -1627,10 +1627,7 @@ public function replicate(array $except = null)
      */
     public function is($model)
     {
-        return ! is_null($model) &&
-               $this->getKey() === $model->getKey() &&
-               $this->getTable() === $model->getTable() &&
-               $this->getConnectionName() === $model->getConnectionName();
+        return ! is_null($model) && $this->getIdentifierOfPersistentRow() === $model->getIdentifierOfPersistentRow();
     }
 
     /**
@@ -1644,6 +1641,15 @@ public function isNot($model)
         return ! $this->is($model);
     }
 
+    public function getIdentifierOfPersistentRow()
+    {
+        return implode('__', [
+            $this->getKey(),
+            $this->getTable(),
+            $this->getConnectionName(),
+        ]);
+    }
+

Edit: I created a PR