How to configure the “dotenv gem” in the rails 7 application

How to configure the “dotenv gem” in the rails 7 application for the set environment variable.

2 Answers

Most of what Pooja is saying is effectively incorrect. The .env file goes into the root of your application, not in the app folder. The syntax of the env vars in .env are delimited with "=" not ": ". For example, a .env would look like this, which similar to how it is done in Node apps:

MYSQL_USERNAME=user
MYSQL_PASSWORD=password
MYSQL_HOST=host

In her snippet above, she only includes the development block in Gemfile, yet performs a check on both development and test in application.rb when loading dotenv. In that case, the Gemfile should look like this and preferably add the gem to the top:

gem 'dotenv-rails', groups: [:development, :test]

In fact, everything I am saying is fundamentally taken from the Gem home page:

Add the below line in the Gemfile

gem 'dotenv-rails', require: 'dotenv/rails-now', groups: [:development]

Run bundle installAdd the below code just below this line Bundler.require(*Rails.groups) in the application.rb

# Load dotenv only in development or test environment
if ['development', 'test'].include? ENV['RAILS_ENV']
Dotenv::Railtie.load
end

Create one file in the app folder with .env name Add your credentials in this .env file like below

DB_USERNAME: username
DB_PASSWORD: password

Use this env variable in the appropriate place like below. in the database.yml

default: &default adapter: postgresql encoding: unicode pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %> host: localhost username: <%= ENV['DB_USERNAME'] %> password: <%= ENV['DB_PASSWORD'] %>

Now your ENV variable setup is done. you can check it from the rails console like below.

rails c
> ENV["DB_USERNAME"]
> username
>ENV["DB_PASSWORD"]
> password