Graphql returns empty array

Question

I'm using graphql to get data to my PWA frontend project.Following is my schema.graphqls

type Query {
 comparelist: [ComparelistOutput] @resolver(class: "NeoSolax\\CompareList\\Model\\Resolver\\ComparelistItemResolver") @doc(description: "An array of items in the customer's compare list")
}
type ComparelistOutput {
 id:String
 sku:String
 url_key:String
}

ComparelistItemResolver.php

class ComparelistItemResolver implements ResolverInterface
{
 use NeoSolax\CompareList\Helper\getCompareList;
 public function __construct(
 getCompareList $getCompareList,
 
 ) {
 
 $this->getCompareList = $getCompareList
 
 }
 public function resolve(
 Field $field,
 $context,
 ResolveInfo $info,
 array $value = null,
 array $args = null
 ) {
 /** @var ContextInterface $context */
 $customerId = $context->getUserId();
 
 $comparelistItems = $this->getCompareList->getCompareListItems($customerId)->getItems();
 $data = [];
 foreach ($comparelistItems as $comparelistItem) {
 $itemProduct = $comparelistItem->getData();
 $data[] = [
 'id' => $itemProduct['product_id'],
 'sku' => $itemProduct['sku'],
 'url_key'=>$itemProduct['url_key']
 ];
 }
 return $data;
 
 }
}

Following is how I get my data to pwa frontend

const {data,loading:comparelistLoading}=useQuery(getCustomerCompareList);

data gets a empty array comparelist.What is wrong with my code?Please help

• Shafeel Sha: print_r($data):die; did you get any data while printing ?

Answer 1

Your $comparelistItems is empty. Therefore, you never perform the code inside the foreach statement, resulting in an empty $data array.

P.S.: $getCompareListis not a standard Magento class, therefore we cannot know if the problem resides inside the getCompareListItems() function you call to populate $compareListItems.

Answer 2

Try this

use NeoSolax\CompareList\Helper\getCompareList;
class ComparelistItemResolver implements ResolverInterface
{
 public function __construct(
 getCompareList $getCompareList,
 ) {
 $this->getCompareList = $getCompareList
 }
 public function resolve(
 Field $field,
 $context,
 ResolveInfo $info,
 array $value = null,
 array $args = null
 )
 {
 /** @var ContextInterface $context */
 $customerId = $context->getUserId();
 $comparelistItems = $this->getCompareList->getCompareListItems($customerId)->getItems();
 $data = [];
 $x = 0;
 foreach ($comparelistItems as $comparelistItem) {
 $itemProduct = $comparelistItem->getData();
 $data[$x]['id'] = $itemProduct['product_id'];
 $data[$x]['sku'] = $itemProduct['sku'];
 $data[$x]['url_key'] = $itemProduct['url_key'];
 $x++;
 }
 return $data;
 }
}

Reference link