Laravel error: Call to a member function first() on string when using Resource::collection

I'm creating an backend with multiple stores. Each stores with their own products

I've created a store and a product and am trying to resource the products to all the stores.

When I try add my products to my store in StoreResource.php

using:

'products' => ProductResource::collection($this->products),

I get the error:

Call to a member function first() on string

I've looked on line for numerous explanations and tutorials, but get met with the same error

* STORE MODEL *

public function products()
{
  return $this->hasMany(Product::class);
}

*STORE CONTROLLER *

public function index()
{
    return StoreResource::collection(Store::with('products')->paginate(5));
}

STORE Resource

<?php

namespace App\Http\Resources;

use Illuminate\Http\Resources\Json\JsonResource;

class StoreResource extends JsonResource
{
    /**
     * Transform the resource into an array.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return array
     */
    public function toArray($request)
    {
      return [
     'id' => $this->id,
     'name' => $this->name,
     'description' => $this->description,
     'image' => $this->image,
     'created_at' => (string) $this->created_at,
     'updated_at' => (string) $this->updated_at,
     'products' => ProductResource::collection($this->products),
     ];
    }
}

* Product MODEL *

public function stores()
{
    return $this->belongsTo(Store::class);
}

*Product CONTROLLER *

public function index()
{
    return ProductResource::collection(Product::with('stores')->paginate(5));
}

Product Resource

<?php

namespace App\Http\Resources;


use Illuminate\Http\Resources\Json\JsonResource;

class Purchaseresource extends JsonResource
{
    /**
     * Transform the resource into an array.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return array
     */
    public function toArray($request)
    {
      return [
        'id' => $this->id,
        'productName' => $this->productName,
        'amount' => $this->amount,
        'total_product_price' => $this->total_product_price,
        'week' => $this->week,
        'day' => $this->day,
        'month' => $this->month,
        'year' => $this->year,
        'created_at' => (string) $this->created_at,
        'updated_at' => (string) $this->updated_at,
      ];
   }
}

What I expect is to get a relation between my store and products so they are displayed as this in the API repsonse

 {
    "id": 0, 
    "name": "Store", 
    "image": "image",
    "products": [
        {
            "id": 1,
            "name": "product",
            "price": 7,
            "qty": 100,
            "total": 0
        },
     ]    
}

So the product would become nested in the store.

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