Phoenix - Connection to mongodb

Phoenix Forum Questions / Help
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1

Heya, so it’s been a while since the last time I touched phoenix and now I’m not finding my way when attempting to connect to a mongodb DB I have running in AWS. I’m defining the worker as:

{Mongo, [
        [
          database: "my_db_name",
          hostname: "mongo://my-remote-db:27017",
          username: "my_username",
          password: "my_password",
          ssl: true,
        ]
      ]},

and getting in return

** (Mix) Could not start application my_app: MyApp.Application.start(:normal, []) returned an error: shutdown: failed to start child: Mongo
    ** (EXIT) an exception was raised:
        ** (FunctionClauseError) no function clause matching in anonymous fn/1 in Keyword.take/2
            (elixir 1.13.0) lib/keyword.ex:1131: anonymous fn([database: "my_db_name", hostname: "mongo://my-remote-db:27017", username: "my_username", password: "my_password", ssl: true]) in Keyword.take/2
            (elixir 1.13.0) lib/keyword.ex:1131: Keyword."-take/2-lists^filter/1-0-"/2
            (mongodb 0.5.1) lib/mongo/topology.ex:20: Mongo.Topology.start_link/2
            (stdlib 3.15) supervisor.erl:414: :supervisor.do_start_child_i/3
            (stdlib 3.15) supervisor.erl:400: :supervisor.do_start_child/2
            (stdlib 3.15) supervisor.erl:384: anonymous fn/3 in :supervisor.start_children/2
            (stdlib 3.15) supervisor.erl:1234: :supervisor.children_map/4
            (stdlib 3.15) supervisor.erl:350: :supervisor.init_children/2
            (stdlib 3.15) gen_server.erl:423: :gen_server.init_it/2
            (stdlib 3.15) gen_server.erl:390: :gen_server.init_it/6
            (stdlib 3.15) proc_lib.erl:226: :proc_lib.init_p_do_apply/3

I have the dep installed. What am I missing?

2

Is this the library that you are using: mongo | Hex?

If so it is nearly 7 years old, I’d aim to use something newer. Are you looking to connect to MongoDB directly or with Ecto?

3

Right, that’s the one.
I’d aim for none of them but being that the DB already exists then I could go with Ecto since it’s already known to me.
From what I found - everything is old and the support is limited.
What would you suggest?

4

I think this one GitHub - zookzook/elixir-mongodb-driver: MongoDB driver for Elixir is actively developed …

5

I could go with this one, but:

1 defmodule MyApp.Repo do
2  use Mongo.Repo,
3    otp_app: :my_app,
4    topology: :mongo
5 end

Resolves into:

(CompileError) lib/deci_admin_panel/repo.ex:2: module Mongo.Repo is not loaded and could not be found
6

Mongo.Repo support is part of very recent changes. Do you run this version?

7

For a fresh start, try this (run a local MongoDB)

  • add {:mongodb_driver, “~> 0.9.0-rc.0”} to dependencies
  • run mix deps.get
  • add {Mongo, [name: :mongo, url: “mongodb://localhost:27017/your-db”]} to your application.ex file
  • Mongo.find(:mongo, “your-collection”, %{}) |> Enum.to_list()

You can change the url to your running AWS instance as well. But sometimes your need to add some more config parameters (ssl stuff).