How to Load Config File Based on Command Line Args In Elixir?

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In Elixir, you can load a config file based on command line arguments by utilizing the Application.get_env/3 function. You can pass the name of the config file as a command line argument using the OptionParser module and then use that argument to load the corresponding config file using Application.get_env/3. This allows you to dynamically choose which config file to load based on the command line args provided when running your Elixir application.


How to handle nested configurations in a config file in Elixir?

One way to handle nested configurations in a config file in Elixir is to use the config.exs file in your project's config directory. You can define nested configurations using Elixir's powerful syntax.


Here's an example of how you can define nested configurations in your config.exs file:

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use Mix.Config

config :my_app, MyApp.Repo,
  username: "username",
  password: "password",
  database: "my_app_dev",
  hostname: "localhost"

config :my_app, :nested_config,
  key1: "value1",
  key2: "value2",
  nested: [
    sub_key1: "sub_value1",
    sub_key2: "sub_value2"
  ]


In this example, we have defined two nested configurations: one for the database connection and another for a general nested configuration. You can access these configurations in your application using the Application.get_env/2 function:

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db_config = Application.get_env(:my_app, MyApp.Repo)
nested_config = Application.get_env(:my_app, :nested_config)

IO.inspect(db_config)
IO.inspect(nested_config)


This will allow you to access and use nested configurations in your Elixir application.


What is a config file loader in Elixir?

In Elixir, a config file loader is responsible for reading and parsing configuration files that contain settings and parameters for an application. The config file loader allows developers to easily define and manage configurations for their Elixir applications, which can then be accessed and used throughout the application code.


Config files typically use the standard Elixir syntax for defining maps and key-value pairs, making it easy to set up environment-specific configurations, define default settings, and store sensitive information such as database credentials or API keys.


By using a config file loader in Elixir, developers can keep their application configurations organized, centralized, and separate from the main codebase, making it easier to maintain, update, and deploy their applications.


What is a config file parser in Elixir?

A config file parser in Elixir is a module or library that is used to read and parse configuration files written in a specific format (such as JSON, YAML, TOML, etc.) into a structured data format that can be easily processed and used by an Elixir application. This allows developers to store configuration settings and parameters in external files, separate from the code, making it easier to manage and maintain the configuration of the application. Some popular config file parsers in Elixir include ConfigParser and Conform.

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