When I run NativeGraph.[TAB] my output is:
MixProject hello/0 read_graph/1 write_graph/2
Which is because most of the functions are not defined in the macro. And in fact my query.ex doesn’t even include e.g. list_queries/1 to make available.
The code to make this work in full isn’t present in the download.
I’d suggest making the complete code available for download so at least I can copy (cheat) and get the same output as the book.
NB Not sure where that MixProject came from!