ProductUpdate - Create an update metafield doesn't work like in documentation example

[WilliamDumontRT]

The documentation on the mutation ProductUpdate gives this example which sounds very useful:

In theory, I should be able to update a product, create metafields, and update metafield values all in the same call.

In practice, when I try to perform such an operation (updating a product and its metafield values), I get an error:
-If I included a key for the metafield: Dupplicate keys found

-If I included a metafield ID instead and just a value: Key is too short

mutation updateProductMetafields($input: ProductInput!) {
  productUpdate(input: $input) {
    product {
      id
      metafields(first: 25) {
        edges {
          node {
            id
            namespace
            key
            value
          }
        }
      }
    }
    userErrors {
      message
      field
    }
  }
}

{
  "input": {
    "metafields": [
      {
        "id": "gid://shopify/Metafield/2337571046",
        "value": "Rubber"
      }
    ],
    "id": "gid://shopify/Product/8269738410214"
  }
}

      "userErrors": [
        {
          "message": "Type can't be blank",
          "field": [
            "metafields",
            "0",
            "type"
          ]
        },
        {
          "message": "Namespace can't be blank",
          "field": [
            "metafields",
            "0",
            "namespace"
          ]
        },
        {
          "message": "Namespace is too short (minimum is 3 characters)",
          "field": [
            "metafields",
            "0",
            "namespace"
          ]
        },
        {
          "message": "Key can't be blank",
          "field": [
            "metafields",
            "0",
            "key"
          ]
        },
        {
          "message": "Key is too short (minimum is 3 characters)",
          "field": [
            "metafields",
            "0",
            "key"
          ]
        }
      ]
    }

I literally copy and pasted the example from the documentation, only replacing ID values. Am I doing something wrong, or is the documentation incorrect?

Thank you

[Liam]

Hi William, 

Can you try with these input variables?

{
  "input": {
    "metafields": [
      {
        "id": "gid://shopify/Metafield/2337571046",
        "namespace": "your_namespace",
        "key": "your_key",
        "value": "Rubber",
        "type": "single_line_text_field"
      }
    ],
    "id": "gid://shopify/Product/8269738410214"
  }
}

Remember to replace "your_namespace" and "your_key" with your own namespace and key. The "type" field should be a valid metafield type. In this case, "single_line_text_field" is used, but you should replace it with your own type if it's different.

Let me know if this still results in an error.

[WilliamDumontRT]

Thank you for your response. The docs say that only mandatory fields when updating are ID and Value. So I shouldn't have to input those.

See my error below...

[WilliamDumontRT · Accepted solution]

Duh, turns out I was taking the metafield ID from the definiton URL, but that's the ID of the definition and not the metafield itself...

It works as intended with the proper ID.