School have books and students.
Book have pages.
How can i get all pages from all books where school_id = 1 ? I tried the code below, but i didn't worked.
Page::whereHas('book.school', function($query) {
$query->where('id', '=', 1);
})->get()->toJson();
Also, what if i'd like to get all pages from book_id = 1 and school_id = 1 ?
I need to use school_id here just to check if the book we are getting the pages is from the same school as the logged student.
Easy way, assuming Book belongsTo School:
Page::whereHas('book', function($query) {
$query->where('school_id', '=', 1);
})->get();
complete solution:
Page::whereHas('book', function($q) {
$q->whereHas('school', function ($q) {
$q->where('id', '=', 1);
});
})->get();
Related
Assume I have book models and borrow models. They are one-to-many relationships. I want to get a collection of all the books but return the result if the book is borrowed within the current week. But if it's not, then don't display. I've been trying whereHas(), but I think it didn't suit what I'm looking for.
$displayed_books = Books::orderBy('updated_at', 'DESC')
->ifHasborrow('borrow', function ($query) {
$query->where('start_date', '>=', currentweek())
->where('end_date', "<=", currentweek());
})
$displayedBooks = Books::orderBy('updated_at', 'DESC')
->where(function ($query) {
$query->whereHas('borrow', function($query) {
$now = Carbon::now();
$query->where([
['start_date', '>=', $now->startOfWeek()],
['end_date', '<=', $now->endOfWeek()]
]);
$query->orWhereDoesntHave('borrow');
})
})->get();
I have a simple structure where a post has many votes. A vote has an "value" property which is either 1 or -1
When reading all posts I'd love to select this sum for each post into a custom property on post level. Currently i do this
$posts = Post::where('published_at', '<=', $date)
->orderBy('published_at', 'desc')
->simplePaginate(20);
$posts->each(function($post) {
$post->overallRating = $post->getRating();
});
This is fully working, however I think it's not that good to make like 20 queries to the database to read the ratings. Is there a way to simplify this in the actual fetch of the posts?
public function getRating()
{
return $this->votes->sum('value');
}
If you want to keep the votes included in the in the pagination results then I would suggest adding with('votes') so they're at least eager loaded i.e.
$posts = Post::with('votes')
->where('published_at', '<=', $date)
->orderBy('published_at', 'desc')
->simplePaginate(20);
However, if you don't want/aren't bothered about having the votes and you just want the ratings for each post you could add the following scope to your Post model:
public function scopeWithRating(Builder $query)
{
if (is_null($query->getQuery()->columns)) {
$query->select([$query->getQuery()->from . '.*']);
}
$query->selectSub(
$this->votes()->getRelationExistenceQuery(
$this->votes()->getRelated()->newQuery(), $query, new Expression('sum(value)')
)->toBase(),
'rating'
);
}
Then:
$posts = Post::withRating()
->where('published_at', '<=', $date)
->orderBy('published_at', 'desc')
->simplePaginate(20);
Hope this helps!
Try this:
$posts = Post::where('published_at', '<=', $date)
->orderBy('published_at', 'desc')
->with(['votes' => function($query) {
$query->sum('value');
}])->simplePaginate(20);
Question. How can I use Eloquent to produce this query:
SELECT campaigns.name, users.name FROM campaigns LEFT JOIN users on campaigns.gamemaster_id = users.id where campaigns.status = 1
Campaigns
id gamemaster_id name status
1 1 campaign1 1
2 2 campaign2 1
Users
id name
1 rick
2 bob
Result
id gamemaster_id name status gamemaster_name
1 1 campaign1 1 rick
2 2 campaign2 1 bob
Campaign model
class Campaign extends Model
{
public function gamemaster()
{
return $this->belongsTo('App\User', 'gamemaster_id');
}
}
My try to make Eloquent, but that fails:
$result = Campaign::where('status', '=', 1)->with('gamemaster')->select('name')->orderBy('users.updated_at', 'desc')->get();
You can do it in two ways, first using the query builder,
$campaigns = DB::table('campaigns')->leftJoin('users', 'campaigns.gamemaster_id', '=', 'users.id')
->select(['campaigns.name as name', 'users.name as gamemaster_name'])
->where('campaigns.status', '=', 1)
->orderBy('users.updated_at', 'desc')
->get();
And with eager loading, you can get the campaigns like below. However, to sort by relation property, you need an another layer which is not that easy to implement.
$campaigns = Campaign::where('status', '=', 1)->with(['gamemaster' => function($query){
$query->select(['id', 'name']);
}]->select('id', 'gamemaster_id', 'name')->get();
But you can use collection functions to easily sort it (However, it will take more execution time)
$campaigns = Campaign::where('status', '=', 1)->with(['gamemaster' => function($query){
$query->select(['id', 'gamemaster_id', 'name', 'updated_at']);
}]->select('id', 'name')->get()->sortByDesc(function ($campaign) {
return $campaign->gamemaster->updated_at;
})
The following query should work:
Campaign::whereStatus(1)
->join('users', 'campaigns.gamemaster_id', '=', 'users.id')
->select('campaigns.name', 'users.name')
->orderBy('users.updated_at', 'desc')
->get()
I want to get all Items (topics) WITH their comments, if comments user_id = $id. I try something like this, but it isn't working. So if Item hasn't got any comment with user_id = $id, then I don't need this Item.
In DiscussionsItem model I have methode:
public function discussionsComments() {
return $this->hasMany('DiscussionsComment', 'discussionsitem_id');
}
My query in controller is like this:
$items = DiscussionsItem::whereBrandId($brand_id)
->whereBrandCountryId($country_id)
->with(['discussionsComments' => function($query) use ($id) {
$query->where('user_id', '=', $id);
}])
->whereHas('discussionsComments', function($query) use ($id) {
$query->where('user_id', '=', $id);
})
->with(['views' => function($query) use ($id) {
$query->where('user_id', $id)->count();
}])
->orderBy('created_at', 'DESC')->get();
My problem is that I get items with comments, where comments user_id != $id.
P.S. I need to take 5 comments, but I cant imagine how to do that, because ->take(5) in my eager load is not working.
You can do a custom scope, or just limit the amount returned by your relation:
public function discussionsComments() {
return $this->hasMany('DiscussionsComment', 'discussionsitem_id')
->latest()
->take(5);
}
here is link to my database schema:
How can I get all topics from the blogs to which the user is subscribed using his id? I use Eloquent ORM.
I have added the following lines to my User model:
public function blogs()
{
return $this->belongsToMany('Blog', 'blog_subscriptions');
}
And then requested in the controller
User::find(1)->blogs; // User id is hardcoded
With that I got all blogs to which the user is subscribed.
And now I am stuck on how to get the topics of those blogs.
Assuming relations:
// User
belongsToMany('Blog', 'user_subscriptions')
// Blog
belongsToMany('User', 'user_subscriptions')
hasMany('Topic')
// Topic
belongsTo('Blog')
1 My way, that will work with any relation, no matter how deeply nested:
User::with(['blogs.topics' => function ($q) use (&$topics) {
$topics = $q->get()->unique();
}])->find($userId);
2 Eloquent standard methods:
$topics = Topic::whereHas('blog', function ($q) use ($userId) {
$q->whereHas('users', function ($q) use ($userId) {
$q->where('users.id', $userId);
});
})->get();
// or
$user = User::find($userId);
foreach ($user->blogs as $blog)
{
$blog->topics; // collection of topics for every single blog
}
3 Joins:
$topics = Topic::join('blogs', 'topics.blog_id', '=', 'blogs.id')
->join('user_subscriptions as us', function ($j) use ($userId) {
$j->on('us.blog_id', '=', 'blogs.id')
->where('us.user_id', '=', $userId);
})->get(['topics.*']);
Mind that last solution will rely on your pivot data consistency. That said, if you can't be sure, that there are no redundant entries in user_subscriptions (eg. blog or user has been deleted but the pivot entry remains), then you need to further join users as well.
I am new to laravel and I don't have the possibility of test this, but I had a similar need and solved it with something like this:
DB::Query('topics')->join('blogs', 'blogs.id', '=', 'topics.blog_id')
->join('blog_subscriptions', 'blogs.id', '=', 'blog_subscriptions.blog_id')
->select('name.id','table.email')
->where('blog_subscriptions.user_id', '=', $user_id);