如何使用点语法遍历laravel中的模型关系

Question

I'm trying to traverse through complex eloquent model relationships/attributes, and I'd like to use a simple dot structure to iterate through this, similar to how you can traverse arrays with Arr::get()

Example:

$data = [
  'foo' => [
    'bar' => [
      'key' => 'value'
    ]
  ]
];
$value = Arr::get($data, 'foo.bar.key'); // returns 'value'

I've tried using

$value = Arr::get($model, 'relation.subrelation.attribute')

However this fails and aways returns null, even though eloquent models support ArrayAccess.

Does laravel have a simple way to accomplish this?

Answer 1

For all those wondering, I've managed to figure out a solution by modifying the arr::pull() function to work specifically with models:

public static function traverse($model, $key, $default = null)
{
    if (is_array($model)) {
        return Arr::get($model, $key, $default);
    }


    if (is_null($key)) {
        return $model;
    }

    if (isset($model[$key])) {
        return $model[$key];
    }

    foreach (explode('.', $key) as $segment) {
        try {
            $model = $model->$segment;
        } catch (\Exception $e) {
            return value($default);
        }
    }

    return $model;
}

Answer 2

Eloquent Models return a Collection which is not the same as Array in PHP. You can convert it to array using toArray() function

$my_model->toArray();

This then gives you an Array. But remember that it converts all nested models inside the main model into an array as well.