Mongodb authentication using elixir-mongo - mongodb

Question

I have just started using Elixir, so I figure I have some basic misunderstanding going on here. Here is the code...
defmodule Mdb do
def connect(collection, this_db \\ "db-test") do
{:ok, mongo} = Mongo.connect("db-test.some-mongo-server.com", 12345)
db = mongo |> Mongo.db(this_db)
db |> Mongo.auth("user", "secretpassword")
db
end
end
I start with iex -S mix
and when I try db = Mdb.connect("users") I get
** (UndefinedFunctionError) undefined function: Mongo.auth/3
Mongo.auth(%Mongo.Db{auth: nil, mongo: %Mongo.Server{host: 'db-test.some-mongo-server.com', id_prefix: 12641, mode: :passive, opts: %{}, port: 12345, socket: #Port<0.5732>, timeout: 6000}, name: "db-stage", opts: %{mode: :passive, timeout: 6000}}, "user", "secretpassword")
(mdb_play) lib/mdb.ex:7: Mdb.connect/2
I looks like Mongo.auth/3 is undefined, but that makes no sense to me. Can any one point me towards my error?
thanks for the help

Answer 1

I just played around it, and faced the same error. As in the error message, Mongo.auth seems not defined, and it might be Mongo.Db.auth instead. However, I faced another error (ArgumentError) on Mongo.Db.auth too. It may be certain issue in the library.
** (ArgumentError) argument error
:erlang.byte_size
...
(mongo) lib/mongo_request.ex:43: Mongo.Request.cmd/3
(mongo) lib/mongo_db.ex:44: Mongo.Db.auth/1
I'm not familiar with the library, but after small change in Mongo.Db.auth, normal call seems started working.
I tried with the following sequence.
mongo = Mongo.connect!(server, port)
db = mongo |> Mongo.db(db_name)
db |> Mongo.Db.auth(user_name, password)
collection = db |> Mongo.Db.collection(collection_name)
collection |> Mongo.Collection.count()
The change I tried is in the following fork-repo.
https://github.com/parroty/elixir-mongo