Configuration in Livebook

[Darth-Knoppix]

Hi 👋,

I'm not very experienced with Mix and Livebook beyond basic usage so forgive me if this is a simple problem to solve.

Question

How can configuration be added in live book, like config.exs in a standard mix project?

Context

I'm finding Livebook is a great way to learn new libraries and concepts and I want to experiment with Ecto directly in Livebook. How would I achieve something like config.exs does in a standard mix project.

e.g. The config from Ecto - Getting Started

import Config

config :friends, Friends.Repo,
  database: "friends",
  username: "user",
  password: "pass",
  hostname: "localhost"

Is this possible to do config like this at runtime within in Livebook or does it need to happen when a livebook instance is run?

[josevalim]

Mix.install/2 has a config option as second argument. So you can do:

Mix.install(
  [:ecto],
  config: [
    app: ...
  ]
)

But in the Ecto case, I just wouldn't use config. Instead I would pass they all as option on the use Ecto.Repo or on start_link.

[Darth-Knoppix]

Perfect, thanks! I understand how it fits together now, MyRepo.start_link(database: "postgres", ...) has done the trick 👍