Laravel get nested relation value

Question

Is exist a possibility to easy get relation value in Laravel 5? Here an example of what i need:

I have model Book and i have author relation to model Author. Author also have relation country to model Country. I need to show on book page country name of Author. I can easy wrote:

echo $model->author->country->name

But what if a author of book not provided or we don't know author coutry? I will got a notice.

So I need to add additional checkings:

if ($model->author && $model->author->country) echo $model->author->country->name

Maybe exists some method in laravel, which simplify getting a value? Maybe something like SomeHelperClass::getValue($model, 'author.country.name'), so if some part of the chain is null, then method also returns null. Thanks.

Why dont you add a method $Book->countryName() to the Book were it checks the author if exist return the country name if not return null or empty string. In other words: Wrap the logic of retrieving the country name in that method — David Lavieri
– David Lavieri, Commented Apr 23, 2016 at 13:08
@DavidLavieri because i have a lot of similar situations and wrap each checking into separate method isn't wise desicion. — f0rtis
– f0rtis, Commented Apr 23, 2016 at 13:46
SomeHelperClass::getValue($model, 'author.country.name') would be as well wrappers and checking or actually queries to database behind the covers, probably even more messy since laravel abstractions are so... abstracts — David Lavieri
– David Lavieri, Commented Apr 23, 2016 at 13:56
@DavidLavieri you can check my answer and use the solution in future. Cheers. — f0rtis
– f0rtis, Commented Apr 26, 2016 at 8:12
there is more complexity behind it. But I guess is fine if operation and time complexity is not a matter for you — David Lavieri
– David Lavieri, Commented Apr 26, 2016 at 17:53

f0rtis · Accepted Answer · 2018-09-19 08:31:26Z

1

Sorry for answering my own question. Anyway:

Laravel 5.1 has helper function array_get, which works similar to what i want. But problem is that function works only with arrays. So i need to eager load all required data and convert object to an array:

$model = Book::with('author.country')->findOrFail($id);
$country_name = array_get($model->toArray(), 'author.country.name');
// or
$country_name = object_get($model, 'author.country.name');

edited Sep 19, 2018 at 8:31

answered Apr 26, 2016 at 8:10

f0rtis

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2 Comments

vozaldi Over a year ago

Then object_get($model, 'nested.relation.field') also will do

Marc Barbeau Over a year ago

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