Introduce config.action_mailer.default_from=

Allows to easily set :from, :replay_to, etc. options in
config/application.rb using simple syntax:

  config.action_mailer.default_options = {from:"no-replay@example.org"}

This was not possible using #default method because

  config.action_mailer.default(from: "no-replay@example.org")

is interpreated as reader method and just returns nil.
It would not call ActionMailer::Base.default method. The only
way of calling this method from config/application.rb was to use
the direct syntax which looks ugly in my opinion:

  config.assets.enabled = false
  config.assets.version = '1.0'
  config.encoding = "utf-8"
  config.action_mailer.default_url_options= {
    host:"example.org",
    protocol:"https"
  }
  ActionMailer::Base.default(from: "no-replay@example.org")

1 files changed, 13 insertions, 0 deletions

diff --git a/actionmailer/test/base_test.rb b/actionmailer/test/base_test.rb
index 144a6bfe39..9d1b1fda33 100644
--- a/actionmailer/test/base_test.rb
+++ b/actionmailer/test/base_test.rb
@@ -653,6 +653,19 @@ class BaseTest < ActiveSupport::TestCase
     assert_equal "Anonymous mailer body", mailer.welcome.body.encoded.strip
   end
 
+  test "default_from can be set" do
+    class DefaultFromMailer < ActionMailer::Base
+      default :to => 'system@test.lindsaar.net'
+      self.default_options = {from: "robert.pankowecki@gmail.com"}
+
+      def welcome
+        mail(subject: "subject")
+      end
+    end
+
+    assert_equal ["robert.pankowecki@gmail.com"], DefaultFromMailer.welcome.from
+  end
+
   protected
 
     # Execute the block setting the given values and restoring old values after