Pass default_url_options from mailer

app/mailers/passwordless/mailer.rb

@@ -17,7 +17,8 @@ def sign_in(session, token = nil)
         session,
         action: "confirm",
         id: session.to_param,
-        token: @token
+        token: @token,
+        **default_url_options
       )
 
       email_field = session.authenticatable.class.passwordless_email_field

test/dummy/app/mailers/application_mailer.rb

@@ -3,4 +3,8 @@
 class ApplicationMailer < ActionMailer::Base
   default from: "from@example.com"
   layout "mailer"
+
+  def default_url_options
+    { host: "example.com" }
+  end
 end

test/mailers/passwordless/mailer_test.rb

@@ -35,4 +35,20 @@ class Passwordless::MailerTest < ActionMailer::TestCase
     assert_match /sign in: hello\n/, email.body.to_s
     assert_match %r{/admins/sign_in/#{session.identifier}/hello}, email.body.to_s
   end
+
+  test("uses default_url_options from config.action_mailer") do
+    session = Passwordless::Session.create!(authenticatable: users(:alice), token: "hello")
+    email = Passwordless::Mailer.sign_in(session, "hello")
+
+    assert_match %r{localhost:3000/users/sign_in/#{session.identifier}/hello}, email.body.to_s
+  end
+
+  test("uses default_url_options from mailer") do
+    WithConfig.with_config({parent_mailer: "ApplicationMailer"}) do
+      session = Passwordless::Session.create!(authenticatable: users(:alice), token: "hello")
+      email = Passwordless::Mailer.sign_in(session, "hello")
+
+      assert_match %r{example.com/users/sign_in/#{session.identifier}/hello}, email.body.to_s
+    end
+  end
 end

test/test_helper.rb

@@ -53,6 +53,11 @@ def with_config(options)
       end
     end
 
+    # We need to reload the application, because the config can set a different
+    # parent_mailer class, which means `Passwordless::Mailer` needs to be
+    # reloaded. Simply reloading the whole application seems to be the easiest.
+    Rails.application.reloader.reload!
+
     yield
   ensure
     Passwordless.reset_config!