mutation.graphql

mutation _ {
  newTodo: createTodo(text: "This is a todo mutation example") {
    text
    done
  }
}

mutations_graphql.go

// more code

mutationType := graphql.NewObject(graphql.ObjectConfig{
	Name: "TodoMutations",
	Fields: graphql.Fields{
		"createTodo": &graphql.Field{
			Type: todoType,
			Args: graphql.FieldConfigArgument{
				"text": &graphql.ArgumentConfig{
					Type: graphql.NewNonNull(graphql.String),
				},
			},
			Resolve: func(params graphql.ResolveParams) (interface{}, error) {
				text := params.Args["text"].(string)
				todo := data.NewTodo(text)
				todo.Save()

				return todo, nil
			},
		},
	},
})

schema, err := graphql.NewSchema(graphql.SchemaConfig{
	Query:    queryType,
	Mutation: mutationType,
})

// more codeL

sample_response.json

{
  "newTodo": {
    "text": "This is a todo mutation example",
    "done": false
  }
}