Laravel pluck an array from nested relationship
Stefan Bogdanescu
Founder & Senior Architect · 2026-06-29
# Laravel: Plucking Nested Arrays from Eloquent Relationships
As developers working with complex relational data in Laravel, one of the most common tasks is retrieving deeply nested information efficiently. When you use eager loading (`with()`) to pull in related models, extracting specific attributes from those nested relationships can often trip up developers.
This post addresses a specific scenario: how to correctly pluck an array (or collection) from a relationship that is itself nested within another eager-loaded relationship. We will walk through the exact issue you encountered and provide the most robust solutions using Eloquent collections.
## The Problem: Plucking the Wrong Data
You are trying to extract the `roomnumber` arrays from your query, but your attempt using `pluck()` returns the wrong attribute.
Letâs review the setup you provided:
```php
$roomnumbers = Room::with(['floorroomcount' => function($query){
$query->with('roomnumber')->get();
}])->where('roomtype_id', $roomtype_id)->get();
// Attempted pluck:
$roomnumbers->pluck('floorroomcount'); // Returns floorroomcount (Incorrect)
```
The reason this fails is that when you call `pluck('column')` on a collection of `Room` models, it only looks at the attributes directly present on the `Room` model or the explicitly loaded relationships *at that level*. Since `floorroomcount` was defined as the primary nested structure in your initial query, Eloquent prioritizes loading that data for the plucking operation.
You need a way to drill down into the results of the eager loading to access the deepest relationship you specified.
## Solution 1: Accessing Nested Data via Collection Mapping
The most straightforward and idiomatic Laravel approach is to iterate over the collection and manually extract the desired nested attribute. This gives you full control over the resulting array structure.
If you want an array of all `roomnumber`s, you need to map through the results:
```php
$rooms = Room::with(['floorroomcount' => function($query){
$query->with('roomnumber')->get();
}])->where('roomtype_id', $roomtype_id)->get();
$roomNumbers = $rooms->map(function ($room) {
// Access the nested relationship directly from the room model instance
return $room->roomnumber;
})->toArray();
// $roomNumbers will now contain an array of just roomnumber values.
```
This method is highly readable and ensures you are accessing the data exactly as structured by your eager loading setup. This pattern is a staple in efficient data retrieval, something we frequently discuss when optimizing database interactions on platforms like [laravelcompany.com](https://laravelcompany.com).
## Solution 2: Using `flatMap` for Flattening Nested Collections
If your goal is not just a list of individual room numbers, but perhaps a single flat array containing all the `roomnumber`s from all rooms in a specific category, you can use collection methods like `flatMap` to flatten the nested structure into a single dimension.
This approach is excellent if you want to consolidate data from multiple related models into one simple list:
```php
$flatRoomNumbers = $rooms->flatMap(function ($room) {
// If roomnumber is expected to be an array itself, use spread operator or collect()
return $room->roomnumber ? [$room->roomnumber] : [];
})->flatten()->toArray();
```
In this example, `flatMap` iterates over the main collection. For each `$room`, it executes a callback and returns an array (or multiple arrays). We use `flatten()` to collapse the resulting nested arrays into a single, one-dimensional array. This is powerful for transforming complex relational data into simple lists quickly.
## Conclusion: Choosing the Right Tool
When dealing with deeply nested eager loading in Laravel Eloquent, remember that methods like `pluck()` are best suited for accessing attributes directly on the main model or simple, direct relationships. For drilling down into nested collectionsâespecially when you need to extract arrays from a relationship that was loaded via a complex scopeâthe power lies in collection manipulation methods like `map()`, `flatMap()`, and `pluck()` applied strategically across the entire result set.
By understanding how Eloquent loads data, you move beyond simple syntax and start mastering efficient data retrieval patterns. Always prioritize clarity and control when manipulating nested relationships!