How to pass variables to metafieldsSet mutation in Shopify Api Node js Grahql client?

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I was trying to use the metafieldsSet mutation to update metafields in Shopify with the following code:

const client = new Shopify.Clients.Graphql(
        process.env.SHOP,
        process.env.PASSWORD
    )
    try {
        const metafields = await client.query({
            data: `mutation metafieldsSet($metafields: [MetafieldsSetInput!]!) {
                metafieldsSet(metafields: $metafields) {
                    userErrors {
                        field
                        message
                    }
                    metafields {
                        key
                        value
                    }
                }
            }           
            `,
            query: {
                metafields: [
                    {
                        key: 'cb_inventory',
                        namespace: 'my_fields',
                        ownerId: 'gid://shopify/ProductVariant/40576138313890',
                        type: 'number_integer',
                        value: '25',
                    },
                ],
            },
        })
        console.log(metafields)
        res.status(200).json({ values: metafields })
    } catch (error) {
        console.log(error)
        res.status(500).json(error)
    }

However, the above mutation returns the following error:

Expected value to not be null
Variable $metafields of type [MetafieldsSetInput!]! was provided invalid value

I assume the variable metafields failed to pass into the mutation because when I run the exact same mutation in the Shopify Admin API GraphiQL explorer, there was no error Shopify Admin API GraphiQL explorer mutation result

I have also looked into the github repo of @shopify/shopify-api. In my understanding, variables are added to the query object.

What am I missing?

Thanks,

Howard

Environment: Next js 11.1.2,

Dependencies: @shopify/shopify-api 1.4.1

shopify graphql node.js
1 Answers

Turns out the syntax is incorrect. The variables should be placed inside the variables object, while the mutation statement should be placed inside the query object.

The following code works now:

const metafields = await client.query({
   data: {
      query: `mutation metafieldsSet($metafields: [MetafieldsSetInput!]!) {
         metafieldsSet(metafields: $metafields) {
            userErrors {
               field
               message
            }
            metafields {
                key
                value
            }
         }
    }`,
       variables: {
           metafields: [
              {
                 key: 'cb_inventory',
                 namespace: 'my_fields',
                 ownerId: 'gid://shopify/ProductVariant/40576138313890',
                  type: 'number_integer',
                value: '25',
             },
           ],
       },
   },
})

ref: https://github.com/Shopify/shopify-node-api/blob/main/src/clients/graphql/test/graphql_client.test.ts

To use the intended API version, you need to first initialise the context with the following code:

Shopify.Context.initialize({
    API_KEY,
    API_SECRET_KEY,
    SCOPES: ['read_products', 'write_products'],
    HOST_NAME: HOST,
    API_VERSION: '2021-10',
})
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