> For the complete documentation index, see [llms.txt](https://stack.sylius.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://stack.sylius.com/grid/index/mutators.md).

# Mutators

When using packages that provide built-in grids (such as Sylius E-Commerce or Sylius plugins), you may need to customize their configuration.

Grid mutators allow you to modify an existing grid without overriding its original definition.

## Usage

Let's assume the `app_book` grid already contains a `title` field. We want the grid to be sorted by title.

To achieve this, create the following grid mutator:

```php
<?php

namespace App\Grid\Mutator;

use Sylius\Bundle\GridBundle\Builder\GridBuilderInterface;
use Sylius\Component\Grid\Attribute\AsGridMutator;
use Sylius\Component\Grid\Mutator\GridMutatorInterface;

#[AsGridMutator(grid: 'app_book')]
final class SortByTitleBookGridMutator implements GridMutatorInterface
{
    public function __invoke(GridBuilderInterface $gridBuilder): void
    {
        $gridBuilder->orderBy('title', 'asc');
    }
}
```

## Priorities

If multiple mutators target the same grid, you can control the order in which they are executed by using the `priority` option.

Mutators with a higher priority are executed before those with a lower priority.

```diff
<?php

namespace App\Grid\Mutator;

use Sylius\Bundle\GridBundle\Builder\GridBuilderInterface;
use Sylius\Component\Grid\Attribute\AsGridMutator;
use Sylius\Component\Grid\Mutator\GridMutatorInterface;

#[AsGridMutator(
    grid: 'app_book',
+    priority: 20,
)]
final class SortByTitleBookGridMutator implements GridMutatorInterface
{
    public function __invoke(GridBuilderInterface $gridBuilder): void
    {
        $gridBuilder->orderBy('title', 'asc');
    }
}
```


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