I have 5 entities that look like this :
character --> character_equipement <-- equipement --> stats_equipement <-- stats
I want to take for a defined character all of his equipements and for each equipements I need stats.
Character Model :
public function equipements(){
return $this->belongsToMany(EquipementsModel::class, 'stuff_equipement', 'id_stuff','id_equipement');
}
Equipements Model :
public function stats(){
return $this->belongsToMany(Stats::class, 'stats_equipement', 'id_equipement','id_equipement');
}
Controller :
$stuff = Character::with('equipements')->where('lien_stuff',$id)->first();
This way, I retrieve all equipements for the defined character. I don't know how to tell my Character model that he must look through Equipements Model to retrieve stats now.
I thought first way that while calling my controller, it will go through equipements() then look for a relation into his own model...
You can use dot notation to chain relations. It's actually fairly easy once you get the hang of it. I kind of guessed what the name of the column was on the stat to add up but hopefully you get the idea.
$character = Character::with('equipements.stats')->where('lien_stuff',$id)->first();
$totalStats = 0;
foreach ($character->equipments as $equipment) {
foreach ($equipment->stats as $stat) {
$totalStats += $stat->value;
}
}
Related
I am trying to get all the ids with coma separated while doing eloquent relationship.
So here is my current queries
Divrank::where('division_id', 591)->with('meta')->orderBy('position', 'asc')->get()
Divrank table has a one to many relation with Divrankmeta model. So with meta I am trying to return
public function meta(){
return $this->hasOne(Divrankmeta::class)->selectRaw('id, match_id,divrank_id, sum(won) as won, sum(loss) as loss, sum(draw) as draw, sum(points) as points, sum(matchePlayed) as matchePlayed, sum(totalSets) as totalSets, sum(totalGames) totalGames')
->groupBy('divrank_id');
}
So far this query works fine..
I get the result like this screenshot
Ok so in my Divrankmeta model, I have a column called winAgainst and it can have some ids and some left null. So with the meta relation I want to retrieve winAgainst ids with coma separated string inside meta object.
For better understanding, here is how Divrankmeta table looks like
How can I do this?
Thank you.
The relation you created is one-to-one not one-to-many. That's why you are getting a meta object of the first matched row instead of an array that contains all related meta records.
I never put the modification codes into the eloquent functions. Those codes seem belongs to somewhere else. From my perspective, using "resources" and modifying the data there is a better idea.
If you chose the do so:
// Divrank.php
public function metas()
{
return $this->hasMany('App\Models\Divrankmeta');
}
// Divrankmeta.php
public function divrank()
{
return $this->belongsTo('App\Models\Divrank');
}
// DivrankController
public function index()
{
return DivrankResource::collection(Divrank::with("metas")->all());
}
Create a resource file.
php artisan make:resource DivrankResource
Now, you can modify your Divrank collection on the resource file before your controller returns it.
public function toArray($request)
{
$metaIds = [];
forEach($this->metas as $meta) {
array_push($metaIds, $meta['id']);
}
$this['metaIds'] = $metaIds;
return parent::toArray($request);
}
I'm not able to test this code. But it will probably work. If you don't want to use resources, you can create the same functionality in your controller as well. Bu we like to make controllers as short as possible.
Ok I think I solved it, These are the changes I did. Thanks
return $this->hasOne(Divrankmeta::class)
// ->selectRaw('id, match_id,divrank_id, sum(won) as won, sum(loss) as loss, sum(draw) as draw, sum(points) as points, sum(matchePlayed) as matchePlayed,
// sum(totalSets) as totalSets, sum(totalGames) totalGames')
->select(\DB::raw("id, match_id,divrank_id, sum(won) as won, sum(loss) as loss, sum(draw) as draw, sum(points) as points, sum(matchePlayed) as matchePlayed,
sum(totalSets) as totalSets, sum(totalGames) totalGames, GROUP_CONCAT(winAgainst) as winAgainst"))->groupBy('divrank_id');
I am trying to query data from my database and pass the results to a view called events, the problem I have is that one of my queries will always return the same result because in the where condition the $events_id is the same always. Is there a better way to do the querying? A better logic?
This code is from my controller called EventController:
public function index()
{
$firm_id = DB::table('firms')->where('user_id', auth()->id())->value('id');
$events_id = DB::table('events')->where('firm_id', $firm_id)->value('id');
$events = DB::table('events')->where('firm_id', $firm_id)->get()->toArray();
$actual_events = DB::table('actual_events')->where('event_id', $events_id)->get()->toArray();
return view('events',['events' => $events,'actual_events' => $actual_events]);
}
Since the $events_id is the same every time, the $actual_events will only contain the first result.
The image I have uploaded shows the problem, my table's first three columns are fine. Starting from the fourth they contain repeated values:
As I guess, you need something like this:
$event_ids = DB::table('events')->where('firm_id', $firm_id)->pluck('id');
$actual_events = DB::table('actual_events')->whereIn('event_id', $event_ids)->get()->toArray();
or write about your problem in details and I will try to help you.
you just said that your tables have relation together.
in this case it's better you using the eloquent for that,
first you should type the relations in model of each table like this:
class User extends Authenticatable{
public function cities()
{
return $this->hasmany('App\City'); //you should type your relation
}
}
for relations you can use this link: laravel relationships
after that when you compact the $user variable to your view, you can use this syntax for getting the city value relation to this user: $user->cities;.
I have one to many relation - Entry can have many Visits.
In my Entry model I have the following methods:
public function visits() {
return $this->hasMany ('Visit', 'entry_id','id');
}
public function visitsCount() {
return $this->hasMany('Visit', 'entry_id','id')
->selectRaw('SUM(number) as count')
->groupBy('entry_id');
}
In Blade I can get number of visits for my entry using:
{{$entry->visits()->count() }}
or
{{ $entry->visitsCount()->first()->count }}
If I want to create accessor for getting number of visits I can define:
public function getNrVisitsAttribute()
{
$related = $this->visitsCount()->first();
return ($related) ? $related->count : 0;
}
and now I can use:
{{ $entry->nr_visits }}
Questions:
In some examples I saw defining such relation this way:
public function getNrVisitsAttribute()
{
if (!array_key_exists('visitsCount', $this->relations)) {
$this->load('visitsCount');
}
$related = $this->getRelation('visitsCount')->first();
return ($related) ? $related->count : 0;
}
Question is: what's the difference between this and the "simple method" I showed at the beginning? Is it quicker/use less resource or ... ?
Why this method doesn't work in this case? $related is null so accessor return 0 whereas using "simple method" it returns correct number of visits
I've tried also changing in visitsCount method relationship from hasMany to hasOne but it doesn't change anything.
1 Your relation won't work because you didn't select the foreign key:
public function visitsCount() {
// also use hasOne here
return $this->hasOne('Visit', 'entry_id','id')
->selectRaw('entry_id, SUM(number) as count')
->groupBy('entry_id');
}
2 Your accessor should have the same name as the relation in order to make sense (that's why I created those accessors in the first place):
public function getVisitsCountAttribute()
{
if ( ! array_key_exists('visitsCount', $this->relations)) $this->load('visitsCount');
$related = $this->getRelation('visitsCount');
return ($related) ? $related->count : 0;
}
This accessor is just a handy way to call the count this way:
$entry->visitsCount;
instead of
$entry->visitsCount->count;
// or in your case with hasMany
$entry->visitsCount->first()->count;
So it has nothing to do with performance.
Also mind that it is not defining the relation differently, it requires the relation to be defined like above.
Assuming your schema reflects one record / model per visit in your visits table, The best method would be to get rid of the visitsCount() relation and only use $entry->visits->count() to retrieve the number of visits to the entry.
The reason for this is that once this relation is loaded, it will simply count the models in the collection instead of re-querying for them (if using a separate relationship)
If your concern is overhead and unnecessary queries: My suggestion would be to eager-load these models in a base controller somewhere as children of the user object and cache it, so the only time you really need to re-query for any of it is when there have been changes.
BaseController:
public function __construct(){
if(!Cache::has('user-'.Auth::user()->id)){
$this->user = User::with('entries.visits')->find(Auth::user()->id);
Cache::put('user-'.Auth::user()->id, $this->user, 60);
} else {
$this->user = Cache::get('user-'.Auth::user()->id);
}
}
Then set up an observer on your Entry model to flush the user cache on save. Another possibility if you are using Memcached or Reddis would be to use cache tags so you don't have to flush the whole user's cache every time an Entry model is added or modified.
Of course, this also assumes that each Entry is related to a user, however, if it isn't and you need to use Entry alone as the parent, the same logic could apply, by moving the Cache class calls in your EntryController
I'm not sure this is a real relation. I will try to explain the best way I can.
So first of all, I have three models :
Appartement,
AppartementPrice
The AppartementPrice depends on :
- appartement_id
I would like the AppartementPrice to be retrieve like that :
If there is a specific price for the appartement, then retrieve it, If not retrieve the price for all appartement which is stored in the database with an appartement_id = 0.
So basically what I would like is to do something like that :
public function price()
{
if(isset($this->hasOne('AppartementPrice')->price) // Check that relation exists
return $this->hasOne('AppartementPrice');
else
return $this->hasOne('AppartementPrice')->where('appartement_id', '0');
}
But this is not working.
It does not retrive me the default price.
I guess anyway this is not a best practice ?
I first tried to get the informations like that :
//Check if appartment has a specific price or retrieve default
if($priceAppartement = AppartementPrice::getPriceByCompanyAppartement($this->id))
return $priceAppartement;
else
return AppartementPrice::getDefaultPrice();
But I had this error :
Relationship method must return an object of type Illuminate\Database\Eloquent\Relations\Relation
when doing :
echo $app->price->price;
How can I check that a relation exists ? And is there a way to do as I describe ?
Thank you
You can't replace relation like this, as what you intend is not logical - you want to retrieve relation that doesn't exist.
Instead you can do this:
public function getPriceAttribute()
{
return ($this->priceRelation) ?: $this->priceDefault();
}
public function priceDefault()
{
// edit: let's cache this one so you don't call the query everytime
// you want the price
return AppartmentPrice::remember(5)->find(0);
}
public function priceRelation()
{
return $this->hasOne('AppartementPrice');
}
Then you achieve what you wanted:
$app->price; // returns AppartmentPrice object related or default one
HOWEVER mind that you won't be able to work on the relation like normally:
$price = new AppartmentPrice([...]);
$app->price()->save($price); // will not work, instead use:
$app->priceRelation()->save($price);
First of all something really important in Laravel 4.
When you do not use parentheses when querying relationship it means you want to retreive a Collention of your Model.
You have to use parentheses if you want to continue your query.
Ex:
// for getting prices collection (if not hasOne). (look like AppartementPrice)
$appartment->price;
// for getting the query which will ask the DB to get all
//price attached to this appartment, and then you can continue querying
$priceQuery = $appartment->price();
// Or you can chain your query
$appartment->price()->where('price', '>', 0)->get() // or first() or count();
Secondly, your question.
//Appartement Model
// This function is needed to keep querying the DB
public function price()
{
return $this->hasOne('AppartementPrice')
}
// This one is for getting the appartment price, like you want to
public function getAppartmentPrice()
{
$price_object = $this->price;
if (!$price_object) // Appartment does not have any price {
return AppartementPrice->where('appartement_id', '=', 0)->get();
}
return $price_object;
}
I'm having trouble with eager loading in laravel
I have these models:
class Page extends Eloquent {
public function translations() {
return $this->has_many('Pagestl', 'page_id');
}
}
and
class Pagestl extends Eloquent {
public static $table = 'pages_tl';
public function page() {
return $this->belongs_to('Page', 'id');
}
}
I want a specific page with its translation data of a specific language.
I retrieve the data like this:
$page_data = Page::with(array('translations' => function($query) {
$query->where('lang_id', '=', 'nl')->first();
}))->find($id);
De result is ok-ish. I get all the page data and the translation of 1 language, dutch (nl). But in order to get a field from the language data I have to this:
$page_data->translations[0]->attributes['content_or_whatever'];
..which i find ugly. I feel i should only have to do something like:
$page_data->translations->content;
..but that gives me an error (Trying to get property of non-object).
Am I missing something or is this just the way it is?
I don't find it necessary to do eager-loading here.
Both ways of doing it will result in 2 queries: select the Page with the given id and then find its first translation.
So, I would do:
$page = Page::find($id);
and then
$page_data = Pagestl::where_page_id_and_lang_id($page->id, 'nl')->first();
Then, assuming the content field exists in pages_tl table, we'll get it by doing:
echo $page_data->content;
Finally, your code looks alright; you don't have to have the second parameter when defining the relationships unless they are different from what Laravel expects.
I'll let you find where the problem is with your code (I couldn't figure out from the information given - could be something to do with strings.php)