APP Object Definition Updates

GraphQL Admin API Troubleshooting
1

I have a metaobject definition creation function that gets run when a user first opens my app. I want to modify the structure of the metaobject definition, specifically change the type of some fields. How can i have this change propagate, and what issues may happen?

2

Hi Ricky,

To modify the structure of a metaobject definition, and change the type of some fields, you’d use the metaobjectDefinitionUpdate mutation. You’d need the ID of the metaobject definition you want to update and you’d use the fieldDefinitions input with the update operation to modify the type or other attributes of the fields. It should look something like:

mutation UpdateMetaobjectDefinition {
  metaobjectDefinitionUpdate(
    id: "gid://shopify/MetaobjectDefinition/578408816",
    definition: {
      fieldDefinitions: [
        {
          update: {
            key: "field_key_to_update",
            type: "new_field_type" # Replace with the desired type
          }
        }
      ]
    }
  ) {
    metaobjectDefinition {
      id
      name
      fieldDefinitions {
        key
        type
      }
    }
    userErrors {
      field
      message
      code
    }
  }
}

For potential issues, changing the type of a field may cause existing metaobjects using this definition to have invalid data, and the mutation may fail if the new type is incompatible with existing data or if the field is required and has invalid values.