add attachments to the new inbound mail

actionmailbox/app/controllers/rails/conductor/action_mailbox/inbound_emails_controller.rb

@@ -20,7 +20,11 @@ module Rails
 
     private
       def new_mail
-        Mail.new params.require(:mail).permit(:from, :to, :cc, :bcc, :in_reply_to, :subject, :body).to_h
+        Mail.new(params.require(:mail).permit(:from, :to, :cc, :bcc, :in_reply_to, :subject, :body).to_h).tap do |mail|
+          params[:mail][:attachments].to_a.each do |attachment|
+            mail.attachments[attachment.original_filename] = { filename: attachment.path, content_type: attachment.content_type }
+          end
+        end
       end
 
       def create_inbound_email(mail)

actionmailbox/app/views/rails/conductor/action_mailbox/inbound_emails/new.html.erb

@@ -38,5 +38,10 @@
     <%= form.text_area :body, size: "40x20" %>
   </div>
 
+  <div>
+    <%= form.label :attachments, "Attachments" %><br>
+    <%= form.file_field :attachments, multiple: true %>
+  </div>
+
   <%= form.submit "Deliver inbound email" %>
 <% end %>

actionmailbox/test/controllers/rails/action_mailbox/inbound_emails_controller_test.rb

@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+require "test_helper"
+
+class Rails::Conductor::ActionMailbox::InboundEmailsControllerTest < ActionDispatch::IntegrationTest
+  test "create inbound email" do
+    with_rails_env("development") do
+      assert_difference -> { ActionMailbox::InboundEmail.count }, +1 do
+        post rails_conductor_inbound_emails_path, params: {
+          mail: {
+            from: "Jason Fried <jason@37signals.com>",
+            to: "Replies <replies@example.com>",
+            bcc: "",
+            in_reply_to: "<4e6e35f5a38b4_479f13bb90078178@small-app-01.mail>",
+            subject: "Discussion: Let's debate these attachments",
+            body: "Let's talk about these images:",
+            attachments: [fixture_file_upload("files/avatar1.jpeg"), fixture_file_upload("files/avatar2.jpeg")]
+          }
+        }
+      end
+
+      assert_equal 2, ActionMailbox::InboundEmail.last.mail.attachments.size
+    end
+  end
+
+  private
+    def with_rails_env(env)
+      old_rails_env = Rails.env
+      Rails.env = env
+      yield
+    ensure
+      Rails.env = old_rails_env
+    end
+end