Fetch environment variables with ENV.fetch()

app/controllers/api/v1/api_controller.rb

@@ -19,7 +19,7 @@ def authenticate
         raise Unauthorized, '`Authorization` header is missing.' unless bearer
 
         token = bearer.match(/Bearer (.+)/)[1]
-        @current_user = JWT.decode(token, ENV['SECRET_KEY_BASE'], true, algorithm: 'HS256').first
+        @current_user = JWT.decode(token, ENV.fetch('SECRET_KEY_BASE'), true, algorithm: 'HS256').first
       rescue StandardError => e
         render status: :unauthorized, json: {
           error: 'UNAUTHORIZED',

app/mailers/application_mailer.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 class ApplicationMailer < ActionMailer::Base
-  SENDER_EMAIL = ENV['APPLICATION_EMAIL_ADDRESS']
+  SENDER_EMAIL = ENV.fetch('APPLICATION_EMAIL_ADDRESS')
   SENDER = "MOSS <#{SENDER_EMAIL}>"
   default from: SENDER
 

app/mailers/notification_mailer.rb

@@ -3,7 +3,7 @@
 class NotificationMailer < ApplicationMailer
   def new_question
     @question = params[:question]
-    @question_url = "#{ENV['FRONT_BASE_URL']}/question/#{@question.id}"
+    @question_url = "#{ENV.fetch('FRONT_BASE_URL')}/question/#{@question.id}"
     mail(to: ENV['TEAM_EMAIL_ADDRESS'], subject: '[WAM] Nous avons besoin de ton avis !')
   end
 end

spec/support/request_helper.rb

@@ -5,7 +5,7 @@ module SwaggerAccessTokenHelper
     include CurrentUserSpecHelper
 
     def access_token
-      JWT.encode(current_user, ENV['SECRET_KEY_BASE'], 'HS256')
+      JWT.encode(current_user, ENV.fetch('SECRET_KEY_BASE'), 'HS256')
     end
   end
 end