I got this error when I go to /products/purchases to get the list of all my purchases but I got this error
Object of class DoctrineORMPersistentCollection could not be converted to string

this is my twig

{% extends 'admin/admin.html.twig' %}

{% block title %}Hello HomeController!{% endblock %}

{% block stylesheets %}
    <link rel="stylesheet" href={{asset('styles/css/purchases.css')}}>
{% endblock %}
{% block main %}
<div class="add">
<a href="{{path('purchase_add')}}" class="btn btn-primary">Ajouter une Vente</a>
</div>
<table class="table">
  <thead>
    <tr>
      <th scope="col">ID</th>
      <th scope="col">Nom de Produit</th>
      <th scope="col">Quantité</th>
    </tr>
  </thead>
  <tbody>
    {% for purchase in purchases %}
    <tr>
      <th scope="row">{{purchase.id}}</th>
      <td>{{purchase.nameproduct}}</td>
      <td>{{purchase.quantity}}</td>
      </tr>
    {% endfor %}
    
  </tbody>
</table>

{% endblock %}

this is my Purchase entity

<?php

namespace AppEntity;

use AppRepositoryPurchaseRepository;
use DoctrineCommonCollectionsArrayCollection;
use DoctrineCommonCollectionsCollection;
use DoctrineORMMapping as ORM;

#[ORMEntity(repositoryClass: PurchaseRepository::class)]
class Purchase
{
    #[ORMId]
    #[ORMGeneratedValue]
    #[ORMColumn]
    private ?int $id = null;

    /**
     * @var Collection<int, Product>
     */
    #[ORMOneToMany(targetEntity: Product::class, mappedBy: 'purchase')]
    #[ORMJoinColumn(name : "name_product", referencedColumnName : "name")]
    private Collection $name_product;

    #[ORMColumn]
    private ?int $quantity = null;

    public function __construct()
    {
        $this->name_product = new ArrayCollection();
    }

    public function getId(): ?int
    {
        return $this->id;
    }

    /**
     * @return Collection<int, Product>
     */
    public function getNameProduct(): Collection
    {
        return $this->name_product;
    }

    public function addNameProduct(Product $nameProduct): static
    {
        if (!$this->name_product->contains($nameProduct)) {
            $this->name_product->add($nameProduct);
            $nameProduct->setPurchase($this);
        }

        return $this;
    }

    public function removeNameProduct(Product $nameProduct): static
    {
        if ($this->name_product->removeElement($nameProduct)) {
            // set the owning side to null (unless already changed)
            if ($nameProduct->getPurchase() === $this) {
                $nameProduct->setPurchase(null);
            }
        }

        return $this;
    }

    public function getQuantity(): ?int
    {
        return $this->quantity;
    }

    public function setQuantity(int $quantity): static
    {
        $this->quantity = $quantity;

        return $this;
    }
    public function __toString()
{
    return $this->name_product; // Retourne le nom de la catégorie comme chaîne
}
}

and this is my Product entity

<?php

namespace AppEntity;

use AppRepositoryProductRepository;
use DoctrineDBALTypesTypes;
use DoctrineORMMapping as ORM;
use AppEntityCategory;

#[ORMEntity(repositoryClass: ProductRepository::class)]
class Product
{
    #[ORMId]
    #[ORMGeneratedValue]
    #[ORMColumn]
    private ?int $id = null;

    #[ORMColumn(length: 255)]
    private ?string $name = null;

    #[ORMColumn(type: Types::TEXT)]
    private ?string $description = null;

    #[ORMColumn]
    private ?int $quantity = null;

    #[ORMColumn]
    private ?int $price = null;

    #[ORMColumn]
    private ?DateTimeImmutable $created_at = null;

    #[ORMColumn]
    private ?DateTimeImmutable $modified_at = null;

    #[ORMColumn(length: 255)]
    private ?string $status = null;

    #[ORMColumn(type: Types::TEXT)]
    private ?string $image_name = null;

    #[ORMManyToOne(inversedBy: 'products')]
    #[ORMJoinColumn(nullable: false)]
    private ?Category $category = null;

    #[ORMManyToOne(inversedBy: 'name_product')]
    private ?Purchase $purchase = null;


    public function getId(): ?int
    {
        return $this->id;
    }

    public function getName(): ?string
    {
        return $this->name;
    }

    public function setName(string $name): static
    {
        $this->name = $name;

        return $this;
    }

    public function getDescription(): ?string
    {
        return $this->description;
    }

    public function setDescription(string $description): static
    {
        $this->description = $description;

        return $this;
    }

    public function getQuantity(): ?int
    {
        return $this->quantity;
    }

    public function setQuantity(int $quantity): static
    {
        $this->quantity = $quantity;

        return $this;
    }

    public function getPrice(): ?int
    {
        return $this->price;
    }

    public function setPrice(int $price): static
    {
        $this->price = $price;

        return $this;
    }

    public function getCreatedAt(): ?DateTimeImmutable
    {
        return $this->created_at;
    }

    public function setCreatedAt(DateTimeImmutable $created_at): static
    {
        $this->created_at = $created_at;

        return $this;
    }

    public function getModifiedAt(): ?DateTimeImmutable
    {
        return $this->modified_at;
    }

    public function setModifiedAt(DateTimeImmutable $modified_at): static
    {
        $this->modified_at = $modified_at;

        return $this;
    }

    public function getStatus(): ?string
    {
        return $this->status;
    }

    public function setStatus(string $status): static
    {
        $this->status = $status;

        return $this;
    }

    public function getImageName(): ?string
    {
        return $this->image_name;
    }

    public function setImageName(string $image_name): static
    {
        $this->image_name = $image_name;

        return $this;
    }

    public function getCategory(): ?Category
    {
        return $this->category;
    }

    public function setCategory(?Category $category): static
    {
        $this->category = $category;

        return $this;
    }

    public function getPurchase(): ?Purchase
    {
        return $this->purchase;
    }

    public function setPurchase(?Purchase $purchase): static
    {
        $this->purchase = $purchase;

        return $this;
    }
    public function __toString()
{
    return $this->name; // Retourne le nom de la catégorie comme chaîne
}
}

I got error when I want to print all the list of purchases