Laravel query "only if" condition - laravel

Question

Users(User/Organization/Group) has many stories as creator.
Stories has many parts of stories.
Users(User/Organization/Group) has subscribers (Another
User/Organization/Group).
Part of stories may be private.
How select all stories where has parts where private == false and private == true only if auth()->user() (User/Organization/Group) is subscriber of story creator (Another User/Organization/Group).
//Stories table
create table stories
(
id bigint unsigned auto_increment primary key,
creator_id int unsigned not null,
creator_type varchar(255) not null,
created_at timestamp null,
updated_at timestamp null
)
//Stories parts table
create table stories_parts
(
id bigint unsigned auto_increment primary key,
story_id int not null,
private tinyint
created_at timestamp null,
updated_at timestamp null
)
//User has subscriptions (Another User/Organization/Group)
create table user_subscriptions
(
user_id bigint unsigned not null,
subscription_id bigint unsigned not null,
subscription_type varchar(255) not null
)
//Organization has subscribers (Another User/Organization/Group)
create table organization_subscribers
(
organization_id bigint unsigned not null,
subscriber_id bigint unsigned not null,
subscriber_type varchar(255) not null
)
//Group has subscribers (Another User/Organization/Group)
create table group_subscribers
(
organization_id bigint unsigned not null,
subscriber_id bigint unsigned not null,
subscriber_type varchar(255) not null
)

Answer 1

UPDATE
$stories = Stories::whereHas('parts', function($q) {
$isSubscriber = $q->whereHas('story.creator.subscribers', function($q) {
return $q->where('id', \Auth::id());
})->get()->isNotEmpty();
return $q->where('private', $isSubscriber);
});
I am executing some queries inside whereHas closure.
$stories = Story::whereHas('parts', function($query) {
$subscribers = $query->story
->creator
->subscribers()
->get();
$userIsSubscriber = $subscribers->contains(function($subscriber) {
return $subscriber->id === Auth::id();
});
return $query->where('private', $userIsSubscriber);
});
The problem here is that this can become resource expensive as it queries subscribers on each story part. Maybe you could use eager loading but I do not know exactly how your relations are implemented.

Answer 2

//In Story model
public function parts(): HasMany
{
return $this->hasMany(Part::class, 'story_id')
->join('stories', 'stories.id', '=', 'parts.story_id');
}
///////
$rawQuery = '(
CASE WHEN EXISTS (
SELECT * FROM `user_subscriptions`
WHERE `user_subscriptions`.`subscription_id` = `stories`.`creator_id`
AND `user_subscriptions`.`subscription_type` = `stories`.`creator_type`
AND `user_subscriptions`.`user_id` = ' . auth()->id() . '
) THEN `parts`.`private` IN (0,1)
ELSE `parts`.`private` IN (0) END
)';
$stories = Story::latest('updated_at')
->whereHas('parts', static function ($query) use ($rawQuery) {
$query->whereRaw($rawQuery);
})
->where('status', true)
->with([
'creator',
'parts' => static function (HasMany $query) use ($rawQuery) {
$query->whereRaw($rawQuery);
}
])->paginate(20);