What is the difference between `$model->relation();` and `$model->relation` in Laravel?

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Understanding the Distinction Between "$model->relation();" and "$model->relation"

In Laravel, the difference between "$model->relation();" and "$model->relation" lies in the type of result returned:

"$model->relation();" returns the relationship object itself. This can be useful if you need to perform additional operations on the relationship, such as specifying additional conditions or constraints.

"$model->relation" returns the result of the relationship. This is typically an array of models or a collection object that contains the related data. It represents the data that you would be interested in using in most cases.

Example Implementation

In your specific scenario, to obtain a list of the distributors for a store and their respective beers, you can use the following approach:

<code class="php">$store = $this->store->find($id)->first();
$distributors = $store->distributors;
$beers = [];

foreach ($distributors as $distributor) {
    $beers = array_merge($distributor->beers->lists('name', 'id'), $beers);
}</code>

Here's the breakdown of the code:

• $store->distributors loads the relationship but does not execute the query. It returns the relationship object.
• $distributor->beers retrieves the beers related to each distributor.
• ->lists('name', 'id') extracts only the beer names and IDs from the result.
• The outer foreach loop iterates through the distributors, merging the beer lists into the $beers array.

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