Can't filter products using query by collection

GraphQL Admin API Troubleshooting
1

The Shopify documentation for the Products API endpoint does not provide an option to filter products directly by collection. While you can use collectionByHandle to retrieve products from a specific collection, there is no built-in way to fetch products that belong to multiple collections in a single query.

query getProducts($first: Int) {
  products(first: $first) {
    edges {
      cursor
      node {
        title
      }
    }
  }
}
2

You can make multiple calls in one query with GraphQL, so you could simply do the following (note you’ll need to remove any duplicates).

query {
  collectionByHandle(handle: "new-arrivals") {
    products {
      ...
    }
  }
  collectionByHandle(handle: "best-sellers") {
    products {
      ...
    }
  }
}