Unable to provide weight & weight_unit in ProductSet variations payload

[nadario]

Since we are forced to migrate from an easy-to-understand REST API to the new GraphQL API, I could not figure out how to achieve the same product synchronization logic from "our" system into the Shopify store.

In the REST API, we could provide `weight` & `weight_unit` in the variations array along with a product. If I try to do the same with GraphQL's `ProductSet` mutation, I get the following error: 

Variable $entity11846 of type ProductSetInput! was provided invalid value for variants.0.weight (Field is not defined on ProductVariantSetInput)

(which makes sense, as the property is not available) https://shopify.dev/docs/api/admin-graphql/2024-10/mutations/productSet#argument-input => variations.

I have the following input payload:

{
  "title": "Lorem Ipsum Dolor Sit",
  "handle": "lorem-ipsum-dolor-sit",
  "descriptionHtml": "<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>",
  "productType": "Lorem, Ipsum, Dolor & Sit Amet",
  "files": [
    {
      "originalSource": "https://example.com/lorem-image-1.jpg",
      "contentType": "IMAGE"
    },
    {
      "originalSource": "https://example.com/lorem-image-2.jpg",
      "contentType": "IMAGE"
    }
  ],
  "variants": [
    {
      "price": 10.50,
      "optionValues": [
        {
          "optionName": "Lorem",
          "name": "Ipsum"
        }
      ]
    },
    {
      "price": 13.99,
      "optionValues": [
        {
          "optionName": "Dolor",
          "name": "Sit"
        }
      ]
    }
  ],
  "productOptions": [
    {
      "name": "Lorem",
      "position": 1,
      "values": [
        {
          "name": "Ipsum"
        }
      ]
    }
  ]
}

So how to achieve to add the weight and weight unit values into the variations payload?

[LucaRaveri]

Do you mean variants? You should update your post since variations doesn't exists.

However I checked the documentation and the measurement field which contains the weight is associated with the InventoryItem type.
Since the InventoryItem type isn't in ProductSetInput type i don't think you can update the weight using the ProductSet mutation.

Is this a bug? Idk, lemme know if you find a solution

[nadario]

Thanks for the Reply. Indeed its "variants" not "variations", sadly i am unable to update the post. 

[Kyle_liu]

@nadario 

This operation is no longer supported in productSet. You can use productVariantsBulkCreate to implement your business

[nadario]

Thanks, @Kyle_liu , for the answer. At least now I am aware that I cannot use the ProductSet.

My two cents on this (knowing this is not your fault, @Kyle_liu , of course)

We have a sync process from our system into Shopify, and now using different strategies with different endpoints is a huge mess. The ProductSet was meant for migration (as far as I know). The ProductSet option is perfect for handling all these processes in bulk with similar behavior. Now, I have to manually update all variants for each product, just because of this. On a huge dataset, this is a real mess.

So if Shopify is forcing us to use the new GraphQL endpoints (I can understand such decisions technically), it should at least provide a similarly good experience for developers and not the opposite.

[Kyle_liu]

Yes, I agree with your point of view. Many people have complained about it.