Resurrect installer.

Running `./bin/rails generate mailbox application --no-test-framework` generates:

```

class ApplicationMailbox < ApplicationMailbox
  def process
  end
end
```

which is not correct for the application mailbox. It shouldn't
respond to process but it should contain a routing hint.

Generally generators aren't meant to be used like the previous commit.
The mailbox generator can certainly add in the ApplicationMailbox
if missing, but it shouldn't be called with "application" as an argument.

Also adds back auto inserting an `ingress` config line in
`config/environmnets/production.rb`.

Fixes #13.

[Kasper Timm Hansen, Andrew Babichev]

4 files changed, 18 insertions, 3 deletions

diff --git a/lib/rails/generators/installer.rb b/lib/rails/generators/installer.rb
new file mode 100644
index 0000000000..a2bc4b5412
--- /dev/null
+++ b/lib/rails/generators/installer.rb
@@ -0,0 +1,8 @@
+say "Copying application_mailbox.rb to app/mailboxes"
+copy_file "#{__dir__}/mailbox/templates/application_mailbox.rb", "app/mailboxes/application_mailbox.rb"
+
+environment <<~end_of_config, env: 'production'
+  # Prepare the ingress controller used to receive mail
+  # config.action_mailbox.ingress = :amazon
+
+end_of_config
diff --git a/lib/tasks/install.rake b/lib/tasks/install.rake
index 598e30c2d4..0885e2d6a5 100644
--- a/lib/tasks/install.rake
+++ b/lib/tasks/install.rake
@@ -5,10 +5,11 @@ namespace :action_mailbox do
   Rake::Task["install:migrations"].clear_comments
 
   desc "Copy over the migration"
-  task install: %w[ environment run_generator copy_migrations ]
+  task install: %w[ environment run_installer copy_migrations ]
 
-  task :run_generator do
-    system "#{RbConfig.ruby} ./bin/rails generate mailbox application --no-test-framework"
+  task :run_installer do
+    installer_template = File.expand_path("../rails/generators/installer.rb", __dir__)
+    system "#{RbConfig.ruby} ./bin/rails app:template LOCATION=#{installer_template}"
   end
 
   task :copy_migrations do
diff --git a/test/dummy/app/mailboxes/application_mailbox.rb b/test/dummy/app/mailboxes/application_mailbox.rb
index 47fb2017d6..be51eb3639 100644
--- a/test/dummy/app/mailboxes/application_mailbox.rb
+++ b/test/dummy/app/mailboxes/application_mailbox.rb
@@ -1,2 +1,5 @@
+# frozen_string_literal: true
+
 class ApplicationMailbox < ActionMailbox::Base
+  # routing /something/i => :somewhere
 end
diff --git a/test/dummy/config/environments/production.rb b/test/dummy/config/environments/production.rb
index 2aaa79f620..1731582220 100644
--- a/test/dummy/config/environments/production.rb
+++ b/test/dummy/config/environments/production.rb
@@ -1,4 +1,7 @@
 Rails.application.configure do
+  # Prepare the ingress controller used to receive mail
+  # config.action_mailbox.ingress = :amazon
+
   # Verifies that versions and hashed value of the package contents in the project's package.json
     config.webpacker.check_yarn_integrity = false
   # Settings specified here will take precedence over those in config/application.rb.