You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: set_due_date.rb
    path of file: ./repos/gitlabhq/app/graphql/mutations/issues
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Mutations
  module Issues
    class SetDueDate < Base
      graphql_name 'IssueSetDueDate'

      argument :due_date,
               Types::TimeType,
               required: :nullable,
               description: 'Desired due date for the issue. Due date is
    
      def resolve(project_path:, iid:, due_date:)
        issue = authorized_find!(project_path: project_path, iid: iid)
        project = issue.project

        ::Issues::UpdateService.new(container: project, current_user: current_user, params: { due_date: due_date })
          .execute(issue)

        {
          issue: issue,
          errors: errors_on_object(issue)
        }
      end