How to read config variable in Phoenix / Elixir?
I'd like to set the title of my app in my/config/config.exs
file:
config :my, My.Endpoint,
url: [host: "localhost"],
root: Path.dirname(__DIR__),
secret_key_base: "secret",
title: "My App"
How can I read title
later to use it in template? Something like:
<div>
Title of my app is <%= ??? %>
</div>
I tried conn.title
and it says there's no such key. But, when I try conn.secret_key_base
it works. Why?
Solution 1:
The get_env function is part of the Application module from the Elixir/Erlang core.
This function returns the value for a specific key in the app's environment.
Considering your configuration, you would access the title
property this way:
Application.get_env(:my, My.Endpoint)[:title]
The third parameter is for passing a default value when the config key doesn't exist.
Solution 2:
You may use Application.get_env(:my, :title)
Solution 3:
Let's say in dev.ex file you have a config variables
config :app_name, AppName.Endpoint,
api_prefix: "api/v2",
api_host: "http://0.0.0.0",
api_port: "3000"
You can fetch all three config variables
Application.get_env(:app_name, AppName.Endpoint)[:api_prefix]
Application.get_env(:app_name, AppName.Endpoint)[:api_host]
Application.get_env(:app_name, AppName.Endpoint)[:api_port]