In this tutorial, I’ll show you how to merge two Eloquent collections in Laravel 12 using the merge() method. This is useful when you want to combine results from two different queries or models. I’ll share different examples, like merging same or different model collections, removing duplicates, and reindexing results.

How to Merge Two Eloquent Collections in Laravel 12

Laravel provides the merge() method to combine two collections into one. This is especially handy when working with Eloquent query results.

 

Example 1: Merge Collections from Same Model

$usersA = User::where('role', 'admin')->get();
$usersB = User::where('role', 'editor')->get();

$merged = $usersA->merge($usersB);

dd($merged);

 

Example 2: Merge and Reindex Collection

$usersA = User::where('role', 'admin')->get();
$usersB = User::where('role', 'editor')->get();

$merged = $usersA->merge($usersB)->values();

dd($merged);

 

Example 3: Merge Different Models

$posts = Post::all();
$videos = Video::all();

$merged = $posts->merge($videos);

dd($merged);

 

Example 4: Merge and Remove Duplicates

$usersA = User::where('status', 'active')->get();
$usersB = User::where('status', 'pending')->get();

$merged = $usersA->merge($usersB)->unique('id')->values();

dd($merged);

 

Example 5: Merge Collections with Custom Keys

$collection1 = collect(['a' => 'apple', 'b' => 'banana']);
$collection2 = collect(['b' => 'blueberry', 'c' => 'cherry']);

$merged = $collection1->merge($collection2);

dd($merged);
// Output: ['a' => 'apple', 'b' => 'blueberry', 'c' => 'cherry']

 

Example 6: Merge Simple Collection

$one = collect(['One', 'Two', 'Three']);
$two = collect(['Four', 'Five']);

$mergedCollection = $one->merge($two);
$mergedCollection->all();

dd($mergedCollection);

 

Example 7: Merge Unique Collection

$one = collect(['One', 'Two', 'Three']);
$two = collect(['Three', 'Four', 'Five']);

$mergedCollection = $one->merge($two);
$mergedCollection = $mergedCollection->unique(function ($item) {
   return $item;
});

$mergedCollection->all();
dd($mergedCollection);

 

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