Apply where condition only to one occurrence - php

Question

I'm building search functionality for my app. To simplify things:
there are two tables: shops and subscriptions
Each shop can have multiple subscription records, subscription has field expires_at. Now, I assume that shop has active subscription if subscription exsists and at least one of shop's subscripion expires_at date is bigger than now().
It is one of the conditions to the whole query. Here is code:
$shops = Shop::when($subscription, function($query, $subscription) {
$query->doesntHave('subscriptions')->orWhereHas('subscriptions', function($q) use ($subscription, $query) {
$query->where('expires_at', '<', now());
});
});
It doesn't work as expected because if i.e. shop has three related subscriptions and at least one of them is expired – it assumes that shop has no active subscription (even though it has).
I would need to implement some nested function inside or whereHas, I guess, to sort by expires_at desc and then limit to one and only then pass where expires_at clause, however I've no idea how.
And I rather need to stick with Eloquent Query Builder rather than DB facade or raw sql.
Basically, it is the same problem what wasn't answered here:
https://laracasts.com/discuss/channels/eloquent/latest-record-from-relationship-in-wherehas?page=1

Answer 1

Try this:
$shops = Shop::doesntHave('subscriptions')->orWhereHas('subscriptions', function ($query) {
$query->whereDate('expires_at', '<', now());
})->get();

Answer 2

try this :
$shops = Shop::WhereHas('subscriptions')->withCount('subscriptions as
active_subscriptions_count' => function ($query) {
$query->where('expires_at', '<', now());
}])->having('active_subscriptions_count', '>=', 3)->get();

Answer 3

Ok, so after some tries in raw sql I figured it out:
$query->select('shops.*')
->leftJoin('subscriptions', 'shops.id', 'subscriptions.shop_id')
->whereNull('subscriptions.id')
->orWhere('subscriptions.expires_at', '<', now())
->where('subscriptions.id', function($q) {
$q->select('id')
->from('subscriptions')
->whereColumn('shop_id', 'shops.id')
->latest('expires_at')
->limit(1);
});
It is not only faster than where exists clause but also gives me what I needed – only the "highest" subscription for given shop is under consideration.