Fix getting-started docs missing fields resolver config & Todo struct UserID field

[a70537952]

1. Fix missing fields resolver config before execute go run github.com/99designs/gqlgen generate on Getting Started causing not generating user resolver

2. Add UserID to Todo struct to fix missing obj.UserID on User resolver

func (r *todoResolver) User(ctx context.Context, obj *model.Todo) (*model.User, error) {
	return &model.User{ID: obj.UserID, Name: "user " + obj.UserID}, nil // Missing obj.UserID
}

I have:

• Added tests covering the bug / feature (see testing)
• Updated any relevant documentation (see docs)

Relevent Issue #2146 #2144

[billymosis]

hello @a70537952 , I also had this problem but it has been fixed with your guidance here.
may I know why you adding new UserID in this line?

[a70537952]

Code Snippet from Getting Started doc

func (r *mutationResolver) CreateTodo(ctx context.Context, input model.NewTodo) (*model.Todo, error) {
	todo := &model.Todo{
		Text:   input.Text,
		ID:     fmt.Sprintf("T%d", rand.Int()),
		User:   &model.User{ID: input.UserID, Name: "user " + input.UserID},
	}
	r.todos = append(r.todos, todo)
	return todo, nil
}

func (r *todoResolver) User(ctx context.Context, obj *model.Todo) (*model.User, error) {
	return &model.User{ID: obj.UserID, Name: "user " + obj.UserID}, nil  //This line
}

Fix missing UserID field from model.Todo

[tmc]

UserID is on input -- I don't think this should be added -- can you look again @a70537952 ?

[a70537952]

@tmc if I'm not wrong, this User resolver is for Query which related to model.Todo userID , nothing to do with UserID on input model.NewTodo userID

[coveralls]

Coverage remained the same at 74.868% when pulling 839a842 on a70537952:master into b8ec51d on 99designs:master.