I have a problem, it's for a school project and I need to allow duplications of the same relation between two entities on my app using Symfony 5 & Doctrine & postgresql .
I have a basicly a ManyToMany relation between Order and Products, I don't want to add fields for quantity, so I'm looking to count the number of occurences of the a same relation id_order & id_product on my order_product table, but I can't persist more than one same relation between order & product.
I searched and mainly saw people tryng to avoid duplications of the same relation, i'm looking for the exact contrary.
Thx
When using relation with Many on at least one side of the relation, you get Collection on the opposite side. On the collection you can call count() method.
So if you need to calculate quantity of Products in your Order, your Order entity can look like this:
/** #Entity */
class Order
{
...
/**
* #ManyToMany(targetEntity="Product", inversedBy="orders")
* #JoinTable(name="order_product")
*/
private $products;
public function __construct()
{
$this->products = new ArrayCollection();
}
public function countProducts(): int
{
return $this->products->count();
}
public function countProductsById(int $productId): int
{
return $this->products->filter(static function(Product $product) use ($productId) {
return $product->getId() === $productId;
})->count();
}
...
}
PS: Also be aware that word Order is a reserved word in PostgreSQL. You need to either name your Order entity differently or escape the naming correctly.
Related
I'm having some trouble figuring out the polymorphic relationships.
I've read the documentation but for me it is quite confusing.
Hope anyone has the time to help me a bit to understanding it.
What I'm trying to do is to have a very simple tag system for some wallpapers.
I started a new test project just to get this working.
I have 3 models: Wallpaper, Tag and WallpaperTag
class Wallpaper extends Model
{
protected $primaryKey = 'wallpaper_id';
protected $table = 'wallpapers';
protected $guarded = ['wallpaper_id'];
/**
* Get all the tags assigned to this wallpaper
*/
public function tags()
{
//
}
}
class Tag extends Model
{
protected $primaryKey = 'tag_id';
protected $table = 'tags';
protected $guarded = ['tag_id'];
/**
* Get all wallpapers that have this given tag
*/
public function wallpapers()
{
//
}
}
class WallpaperTag extends Model
{
protected $primaryKey = 'wallpaper_tag_id';
protected $table = 'wallpaper_tags';
protected $guarded = ['wallpaper_tag_id'];
/**
* #return \Illuminate\Database\Eloquent\Relations\BelongsTo
* Wallpaper relation
*/
public function wallpaper()
{
return $this->belongsTo('App\Wallpaper','wallpaper_id');
}
/**
* #return \Illuminate\Database\Eloquent\Relations\BelongsTo
* Tag relation
*/
public function tag()
{
return $this->belongsTo('App\Tag','tag_id');
}
}
The wallpapers table in this test project contains only wallpaper_id
The tags table contanis a tag_id and a tag
The wallpaper_tags table contains a foreign key for both tags.tag_id and wallpapers.wallpaper_id
I've set it up like this so wallpapers can share tags without duplicating them. The problem is that I really dont understand the polymorphic relations and the example in the documentation.
Can anyone here 'spoonfeed' how this would work? :') Thanks in advance for all help.
So you are trying to create a relationship with ManyToMany between 2 tables, which in the DB needs a 3rd table to allow you to create such relationship.
This is due to the fact that one Wallpaper can have many Tag and vice versa! For such you need a 3rd table that holds that information accordingly.
The 3rd table is only holding ids in relationship to your 2 main tables. This allows the flexibility you are looking for, while your Object tables can actually hold information specific to them, without you having to duplicate it.
If you were to store the relationship ids on both tables you would be forced to duplicate your data and that is just something you do not wish on databases! Imagine having to update 1000 rows because it is basically the same wallpaper but with so many different tags.
Anyway, below is the code that should be get you going:
You do need to create a class to represent your relationship table (Kudos on the WallpaperTag class! That is the one!);
You do not touch that class anymore, do not add belongs or any other function!
You create the relationships on the main classes Wallpaper and Tag;
class Wallpaper extends Model
{
...
public function tags()
{
return $this->belongsToMany('App\Tag', 'wallpaper_tag', 'tag_id', 'wallpaper_id');
}
}
class Tag extends Model
{
...
public function wallpapers()
{
return $this->belongsToMany('App\Wallpaper', 'wallpaper_tag', 'wallpaper_id', 'tag_id');
}
}
class WallpaperTag extends Model
{
}
Laravel should create a relationship between your classes and map it accordingly to the correct 3rd table to sort the search for you.
If you follow the semantics all you needed was the class name. If ids are to change, then you will need to start telling Laravel what id column names it should be looking for as you deviate from the normal behaviour. It still finds it, just needs some guidance on the names! Hence why we start adding more parameters to the relationships belongsTo or hasMany etc :)
Pivot Table Migration
You do not need an id for your pivot table since your primary key is a combination of the two foreign keys from the other tables.
$table->bigInteger('wallpaper_id')->unsigned()->nullable();
$table->foreign('wallpaper_id')->references('wallpaper_id')
->on('wallpaper')->onDelete('cascade');
$table->bigInteger('tag_id')->unsigned()->nullable();
$table->foreign('tag_id')->references('tag_id')
->on('tags')->onDelete('cascade');
Let me know if it helped! :3
I have a relation in Doctrine2 #ORM\OneToMany, suposing that i have table school and student, in the entity school i have the #ORM\OneToMany column students,
and i also have a virtual deletion column deleted_at, so every student that has the deleted_at different of null is a deleted student that is supposed not to appear in the column #ORM\OneToMany $students. How can i make this filter?
/**
* #var \Doctrine\Common\Collections\ArrayCollection
*
* #ORM\OneToMany(targetEntity="App\Oceano\Entities\Student",
* mappedBy="cartCore",
* cascade={"all"}
* )
*/
private $students;
So, when i call for school students, it is retrieving also the deleted ones.
$schoolObj->getStudents();
Any Solution using annotation or some clean change?
You practically described Laravel's soft deleting feature. So, if you use it, you do not need to do anything and soft deleted students will not appear. You just need to add Illuminate\Database\Eloquent\SoftDeletes trait to the Student model.
If you're using some own functionality, create a local scope in the Student model:
public function scopeNotDeleted($query)
{
return $query->whereNull('deleted_at');
}
And use it:
Student::notDeleted()->get();
Or:
$school->students()->notDeleted()->get();
You can use Criteria filter class in your entity to students collection which are not deleted
protected getStudents() {
$criteria = \Doctrine\Common\Collections\Criteria::create()
->where(\Doctrine\Common\Collections\Criteria::expr()->eq('deleted_at', null));
return $this->students->matching($criteria);
}
To get deleted students you could write it like
protected getDeletedStudents() {
$criteria = \Doctrine\Common\Collections\Criteria::create()
->where(\Doctrine\Common\Collections\Criteria::expr()->neq('deleted_at', null));
return $this->students->matching($criteria);
}
How filter data inside entity object in Symfony 2 and Doctrine
I have a table called bonus. A user can get a bonus (it's like an reward) for certain actions. Well, the bonus can be assigned to many users and many users can get the same bonus. So it's a many to many relation between user and bonus.
This is no problem so far. But users can get the same bonus for different actions. So let's say there is a bonus for voting on a picture. Well, one user could vote on one picture and another one could vote on another picture which I'd like to save in the many-to-many table.
Furthermore there could be a bonus for writing a comment which is clearly another table than picture votes.
The problem here is that I would need to save the polymorphic type in the bonus table and the ID in the many-to-many table.
I think this should be the best way but how would I realize it with laravel? I think this is not a normal use case. But still I'd like to use it as other relations in laravel so that I could fetch a user and get his bonuses with the correct polymorphic relation.
Do you have any ideas?
You are probably going to have to develop your own relationship classes.
Ex:
MODEL
public function answers()
{
$instance = new Response();
$instance->setSid($this->sid);
return new QuestionAnswerRelation($instance->newQuery(),$this);
}
RELATIONSHIP
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Collection;
use Illuminate\Database\Eloquent\Relations\Relation;
use Pivotal\Survey\Models\Answer;
use Pivotal\Survey\Models\Collections\AnswerCollection;
use Pivotal\Survey\Models\QuestionInterface;
use Pivotal\Survey\Models\SurveyInterface;
class QuestionAnswerRelation extends Relation
{
/**
* Create a new relation instance.
*
* #param \Illuminate\Database\Eloquent\Builder $query
* #param \Illuminate\Database\Eloquent\Model $parent
* #return void
*/
public function __construct(Builder $query, QuestionInterface $parent)
{
$table = $query->getModel()->getTable();
$this->query = $query
->select(array(
\DB::raw($parent->sid.'X'.$parent->gid.'X'.$parent->qid . ' AS value'),
'id'
));
$this->query = $query;
$this->parent = $parent;
$this->related = $query->getModel();
$this->addConstraints();
}
public function addEagerConstraints(array $models)
{
parent::addEagerConstraints($models);
}
public function initRelation(array $models, $relation)
{
}
public function addConstraints()
{
}
public function match(array $models, Collection $results, $relation)
{
}
public function getResults()
{
$results = $this->query->get();
$answerCollection = new AnswerCollection();
foreach($results as $result)
{
$answer = new Answer($result->toArray());
$answer->question = $this->parent;
$answerCollection->add($answer);
}
return $answerCollection;
}
In this case we are using Lime Survey which creates a unique table (note the $instance->setSid() changes the table name) for each of its surveys and a unique column for each of its answer -> question values. ( note $parent->sid.'X'.$parent->gid.'X'.$parent->qid. 'AS value')
Where sid = survey_id, gid = group_id(I think) and qid = question_id
Its was quite irritating.
Note how I reference values from the parent to further develop the query.
You should be able to follow a similar route to achieve whatever your heart desires and still maintain the feasibility to use Eloquent.
I'm looking for a way to use multiple tables (One-to-one) in one Doctrine 2 Entity class. Can this be achieved using plain annotations? Adding more classes is not something what I want to do.
I have the following table structure:
Attribute:
id
type_id
value
AttributeType:
id
name
unit
What I would like to do is create an entity which can basically call getters and setters for the 2 tables from the same class, without having to create separate entity classes, e.g.:
<?php
class Attribute {
public function getName(){ return $this->name; } // From AttributeType
public function getValue(){ return $this->value; } // From Attribute
}
?>
Any help is greatly appriciated.
I think this is what you are looking for
/**
* #OneToOne(targetEntity="AttributeType")
* #JoinColumn(name="type_id", referencedColumnName="id")
*/
Refer Docmentation for more details
I have these 3 table
"Business" with these fields: Id, Name, etc..
"City" with these fields: Id, Name, etc..
And then I have a table called BusinessCity (given that a bussines can be related to many cities). This table has the fields "BusinessId" and "CityId".
Im trying to relate the CityId to the City entity, and BusinessId to the business entity, on the class BusinessCity. I've been googling this for the past 3 days and couldnt find an answer, if this has been asked before im sorry i didnt see it. Could anyone help me or give me some pointers on how to get this done. Thanks in advance
What you are trying to achieve is a bi-directional many-to-many relation with a joinTable.
Many businesses can reside in multiple cities and in one city there can be multiple businesses.
In a many-to-many relationship either side can be the owning side. JoinTable definition can be left out and has sensible defaults but if you want to specify it concretely i included it in the example.
Business (in this example: owning side = inversedBy = JoinTable definition)
/**
* #ORM\ManyToMany(targetEntity="Your/Bundle/City", inversedBy="businesses",cascade="{persist,merge}" fetch="EAGER")
* #ORM\JoinTable(name="BusinessCity",
* joinColumns={#JoinColumn(name="business_id", referencedColumnName="id")},
* inverseJoinColumns={#JoinColumn(name="city_id", referencedColumnName="id")}
* )
*/
protected $cities;
public function __construct()
{
$this->cities = new ArrayCollection();
}
public function getCities()
{
return $this->cities;
}
public function setCities(Collection $cities)
{
// using map with closure to have dublicate/type-checking provided by addCity
$this->cities->map(function($city) {
$this->addCity($city);
});
return $this;
}
public function addCity(CityInterface $city)
{
// ... you don't want dublicates in your collection
if (!$this->cities->contains($city)) {
$this->cities->add($city);
}
return $this;
}
public function removeCity(CityInterface $city)
{
$this->cities->removeElement($city);
return $this;
}
// other properties and methods ..
City (inverse side = mappedBy)
/**
* #ORM\ManyToMany(targetEntity="Your/Bundle/Business", mappedBy="cities")
*/
protected $businesses;
// getters & setters ...
// other properties and methods ...
This is actually pretty simple, all you have to do is define your JoinTable. It's not easy to find in the docs, but there is an example in the section Composite Primary Keys.
In short, all you have to do is use oneToMany/manyToOne-associations with the class representing your JoinTable instead of directly associating both Business and City with ManyToMany-associations.