From b786f065d3fc6b0869f7f485042e8667e71ff66d Mon Sep 17 00:00:00 2001
From: Yves Senn <yves.senn@gmail.com>
Date: Sat, 29 Sep 2012 22:29:29 +0200
Subject: Do not render views when mail() isn't called. (NullMail refactoring)

---
 actionmailer/CHANGELOG.md                                  |  5 +++++
 actionmailer/lib/action_mailer/base.rb                     | 14 +++++++++++++-
 actionmailer/test/base_test.rb                             |  6 ++++++
 .../test/fixtures/base_mailer/without_mail_call.erb        |  1 +
 actionmailer/test/mailers/base_mailer.rb                   |  3 +++
 5 files changed, 28 insertions(+), 1 deletion(-)
 create mode 100644 actionmailer/test/fixtures/base_mailer/without_mail_call.erb

diff --git a/actionmailer/CHANGELOG.md b/actionmailer/CHANGELOG.md
index 68b34805ff..ebce32bf11 100644
--- a/actionmailer/CHANGELOG.md
+++ b/actionmailer/CHANGELOG.md
@@ -1,5 +1,10 @@
 ## Rails 4.0.0 (unreleased) ##
 
+* Do not render views when mail() isn't called.
+  Fix #7761
+
+  *Yves Senn*
+
 * Support `Mailer.deliver_foo(*args)` as a synonym for
   `Mailer.foo(*args).deliver`. This makes it easy to write e.g.
   `Mailer.expects(:deliver_foo)` when testing code that calls
diff --git a/actionmailer/lib/action_mailer/base.rb b/actionmailer/lib/action_mailer/base.rb
index fee4a64248..4d1c697502 100644
--- a/actionmailer/lib/action_mailer/base.rb
+++ b/actionmailer/lib/action_mailer/base.rb
@@ -510,7 +510,19 @@ module ActionMailer
 
     def process(*args) #:nodoc:
       lookup_context.skip_default_locale!
-      super
+
+      generated_mail = super
+      unless generated_mail
+        @_message = NullMail.new
+      end
+    end
+
+    class NullMail #:nodoc:
+      def body; '' end
+
+      def method_missing(*args)
+        nil
+      end
     end
 
     def mailer_name
diff --git a/actionmailer/test/base_test.rb b/actionmailer/test/base_test.rb
index 1cb3ce63fe..b30ec2ddc9 100644
--- a/actionmailer/test/base_test.rb
+++ b/actionmailer/test/base_test.rb
@@ -499,6 +499,12 @@ class BaseTest < ActiveSupport::TestCase
     end
   end
 
+  test 'the view is not rendered when mail was never called' do
+    mail = BaseMailer.without_mail_call
+    assert_equal('', mail.body.to_s.strip)
+    mail.deliver
+  end
+
   # Before and After hooks
 
   class MyObserver
diff --git a/actionmailer/test/fixtures/base_mailer/without_mail_call.erb b/actionmailer/test/fixtures/base_mailer/without_mail_call.erb
new file mode 100644
index 0000000000..290379d5fb
--- /dev/null
+++ b/actionmailer/test/fixtures/base_mailer/without_mail_call.erb
@@ -0,0 +1 @@
+<% raise 'the template should not be rendered' %>
\ No newline at end of file
diff --git a/actionmailer/test/mailers/base_mailer.rb b/actionmailer/test/mailers/base_mailer.rb
index f25d9b9aff..52342bc59e 100644
--- a/actionmailer/test/mailers/base_mailer.rb
+++ b/actionmailer/test/mailers/base_mailer.rb
@@ -115,4 +115,7 @@ class BaseMailer < ActionMailer::Base
   def email_with_translations
     mail body: render("email_with_translations", formats: [:html])
   end
+
+  def without_mail_call
+  end
 end
-- 
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