Result of a delete mutation?

Question

What should be the result of a delete mutation in Graphql? I'm using the graphql-ruby gem. Here's an example of my mutation, but I'm just not sure what I should be returning as the response.

Mutations::Brands::Delete = GraphQL::Relay::Mutation.define do
  name "DeleteBrand"
  description "Delete a brand"

  input_field :id, types.ID

  # return_field ??

  resolve ->(object, inputs, ctx) {
    brand = Brand.find(inputs[:id])
    brand.destroy
  }
end

Answer 1

You can return deleted_id or message. If it is an associated object you can return updated object like below example.

Destroy = GraphQL::Relay::Mutation.define do
name 'DestroyComment'
description 'Delete a comment and return post and deleted comment ID'

# Define input parameters
input_field :id, !types.ID

# Define return parameters
return_field :deletedId, !types.ID
return_field :article, ArticleType
return_field :errors, types.String

resolve ->(_obj, inputs, ctx) {
  comment = Comment.find_by_id(inputs[:id])
  return { errors: 'Comment not found' } if comment.nil?

  article = comment.article
  comment.destroy

  { article: article.reload, deletedId: inputs[:id] }
}

http://tech.eshaiju.in/blog/2017/05/15/graphql-mutation-query-implementation-ruby-on-rails/