[9.x] Force countBy method in EloquentCollection to return base collection

src/Illuminate/Database/Eloquent/Collection.php

@@ -582,38 +582,14 @@ public function getDictionary($items = null)
      */
 
     /**
-     * Get an array with the values of a given key.
-     *
-     * @param  string|array<array-key, string>  $value
-     * @param  string|null  $key
-     * @return \Illuminate\Support\Collection<array-key, mixed>
-     */
-    public function pluck($value, $key = null)
-    {
-        return $this->toBase()->pluck($value, $key);
-    }
-
-    /**
-     * Get the keys of the collection items.
-     *
-     * @return \Illuminate\Support\Collection<int, TKey>
-     */
-    public function keys()
-    {
-        return $this->toBase()->keys();
-    }
-
-    /**
-     * Zip the collection together with one or more arrays.
-     *
-     * @template TZipValue
+     * Count the number of items in the collection by a field or using a callback.
      *
-     * @param  \Illuminate\Contracts\Support\Arrayable<array-key, TZipValue>|iterable<array-key, TZipValue>  ...$items
-     * @return \Illuminate\Support\Collection<int, \Illuminate\Support\Collection<int, TModel|TZipValue>>
+     * @param  (callable(TValue, TKey): mixed)|string|null  $countBy
+     * @return \Illuminate\Support\Collection<array-key, int>
      */
-    public function zip($items)
+    public function countBy($countBy = null)
     {
-        return $this->toBase()->zip(...func_get_args());
+        return $this->toBase()->countBy($countBy);
     }
 
     /**
@@ -647,6 +623,16 @@ public function flip()
         return $this->toBase()->flip();
     }
 
+    /**
+     * Get the keys of the collection items.
+     *
+     * @return \Illuminate\Support\Collection<int, TKey>
+     */
+    public function keys()
+    {
+        return $this->toBase()->keys();
+    }
+
     /**
      * Pad collection to the specified length with a value.
      *
@@ -661,6 +647,31 @@ public function pad($size, $value)
         return $this->toBase()->pad($size, $value);
     }
 
+    /**
+     * Get an array with the values of a given key.
+     *
+     * @param  string|array<array-key, string>  $value
+     * @param  string|null  $key
+     * @return \Illuminate\Support\Collection<array-key, mixed>
+     */
+    public function pluck($value, $key = null)
+    {
+        return $this->toBase()->pluck($value, $key);
+    }
+
+    /**
+     * Zip the collection together with one or more arrays.
+     *
+     * @template TZipValue
+     *
+     * @param  \Illuminate\Contracts\Support\Arrayable<array-key, TZipValue>|iterable<array-key, TZipValue>  ...$items
+     * @return \Illuminate\Support\Collection<int, \Illuminate\Support\Collection<int, TModel|TZipValue>>
+     */
+    public function zip($items)
+    {
+        return $this->toBase()->zip(...func_get_args());
+    }
+
     /**
      * Get the comparison function to detect duplicates.
      *

tests/Database/DatabaseEloquentCollectionTest.php

@@ -496,6 +496,7 @@ public function testNonModelRelatedMethods()
         $this->assertEquals(BaseCollection::class, get_class($a->collapse()));
         $this->assertEquals(BaseCollection::class, get_class($a->flatten()));
         $this->assertEquals(BaseCollection::class, get_class($a->zip(['a', 'b'], ['c', 'd'])));
+        $this->assertEquals(BaseCollection::class, get_class($a->countBy('foo')));
         $this->assertEquals(BaseCollection::class, get_class($b->flip()));
     }