Add optional S3 config/backend for ActiveStorage

config/environments/development.rb

@@ -71,6 +71,9 @@ Rails.application.configure do
   # Allow requests from any IP
   config.web_console.whiny_requests = false
 
-  # Store attachments on the local disk (in ./storage)
-  config.active_storage.service = :local
+  if ENV["S3_ENABLED"]
+    config.active_storage.service = :s3
+  else
+    config.active_storage.service = :local
+  end
 end

config/environments/production.rb

@@ -110,9 +110,11 @@ Rails.application.configure do
   # Set this to true and configure the email server for immediate delivery to raise delivery errors.
   config.action_mailer.raise_delivery_errors = true
 
-  # TODO make configurable
-  # Store attachments in S3-compatible back-end
-  config.active_storage.service = :local
+  if ENV["S3_ENABLED"]
+    config.active_storage.service = :s3
+  else
+    config.active_storage.service = :local
+  end
 
   # Enable locale fallbacks for I18n (makes lookups for any locale fall back to
   # the I18n.default_locale when a translation cannot be found).

config/environments/test.rb

@@ -52,6 +52,10 @@ Rails.application.configure do
 
   config.active_job.queue_adapter = :test
 
-  # Store attachments on the local disk (in ./tmp)
-  config.active_storage.service = :test
+  if ENV["S3_ENABLED"]
+    config.active_storage.service = :s3
+  else
+    # Store attachments on the local disk (in ./tmp)
+    config.active_storage.service = :test
+  end
 end