Refactor content type setting, added tests to ensure boundary exists on multipart and fixed typo

actionmailer/lib/action_mailer/base.rb

@@ -49,7 +49,7 @@ module ActionMailer #:nodoc:
   #
   # The mail method, if not passed a block, will inspect your views and send all the views with
   # the same name as the method, so the above action would send the +welcome.plain.erb+ view file
-  # as well as the +welcome.html.erb+ view file in a +multipart/alternate+ email.
+  # as well as the +welcome.html.erb+ view file in a +multipart/alternative+ email.
   # 
   # If you want to explicitly render only certain templates, pass a block:
   # 
@@ -162,7 +162,7 @@ module ActionMailer #:nodoc:
   # 
   # Which will (if it had both a <tt>.text.erb</tt> and <tt>.html.erb</tt> tempalte in the view
   # directory), send a complete <tt>multipart/mixed</tt> email with two parts, the first part being
-  # a <tt>multipart/alternate</tt> with the text and HTML email parts inside, and the second being
+  # a <tt>multipart/alternative</tt> with the text and HTML email parts inside, and the second being
   # a <tt>application/pdf</tt> with a Base64 encoded copy of the file.pdf book with the filename
   # +free_book.pdf+.
   #
@@ -445,7 +445,7 @@ module ActionMailer #:nodoc:
     #     format.html { render :text => "<h1>Hello Mikel!</h1>" }
     #   end
     # 
-    # Which will render a <tt>multipart/alternate</tt> email with <tt>text/plain</tt> and
+    # Which will render a <tt>multipart/alternative</tt> email with <tt>text/plain</tt> and
     # <tt>text/html</tt> parts.
     def mail(headers={}, &block)
       # Guard flag to prevent both the old and the new API from firing
@@ -465,10 +465,11 @@ module ActionMailer #:nodoc:
 
       # Render the templates and blocks
       responses, sort_order = collect_responses_and_sort_order(headers, &block)
-      content_type ||= create_parts_from_responses(m, responses, charset)
+      
+      create_parts_from_responses(m, responses, charset)
 
       # Tidy up content type, charset, mime version and sort order
-      m.content_type = content_type
+      m.content_type = set_content_type(m, content_type)
       m.charset      = charset
       m.mime_version = mime_version
       sort_order     = headers[:parts_order] || sort_order || self.class.default_implicit_parts_order.dup
@@ -485,6 +486,20 @@ module ActionMailer #:nodoc:
 
   protected
 
+    def set_content_type(m, user_content_type)
+      params = m.content_type_parameters || {}
+      case
+      when user_content_type.present?
+        user_content_type
+      when m.has_attachments?
+        ["multipart", "mixed", params]
+      when m.multipart?
+        ["multipart", "alternative", params]
+      else
+        self.class.default_content_type.dup
+      end
+    end
+
     def default_subject #:nodoc:
       mailer_scope = self.class.mailer_name.gsub('/', '.')
       I18n.t(:subject, :scope => [:actionmailer, mailer_scope, action_name], :default => action_name.humanize)
@@ -545,14 +560,12 @@ module ActionMailer #:nodoc:
         return responses[0][:content_type]
       elsif responses.size > 1 && m.has_attachments?
         container = Mail::Part.new
-        container.content_type = "multipart/alternate"
+        container.content_type = "multipart/alternative"
         responses.each { |r| insert_part(container, r, charset) }
         m.add_part(container)
       else
         responses.each { |r| insert_part(m, r, charset) }
       end
-
-      m.has_attachments? ? "multipart/mixed" : "multipart/alternate"
     end
 
     def insert_part(container, response, charset) #:nodoc:

actionmailer/test/base_test.rb

@@ -200,7 +200,7 @@ class BaseTest < ActiveSupport::TestCase
   test "implicit multipart" do
     email = BaseMailer.implicit_multipart.deliver
     assert_equal(2, email.parts.size)
-    assert_equal("multipart/alternate", email.mime_type)
+    assert_equal("multipart/alternative", email.mime_type)
     assert_equal("text/plain", email.parts[0].mime_type)
     assert_equal("TEXT Implicit Multipart", email.parts[0].body.encoded)
     assert_equal("text/html", email.parts[1].mime_type)
@@ -223,7 +223,7 @@ class BaseTest < ActiveSupport::TestCase
   test "implicit multipart with attachments creates nested parts" do
     email = BaseMailer.implicit_multipart(:attachments => true).deliver
     assert_equal("application/pdf", email.parts[0].mime_type)
-    assert_equal("multipart/alternate", email.parts[1].mime_type)
+    assert_equal("multipart/alternative", email.parts[1].mime_type)
     assert_equal("text/plain", email.parts[1].parts[0].mime_type)
     assert_equal("TEXT Implicit Multipart", email.parts[1].parts[0].body.encoded)
     assert_equal("text/html", email.parts[1].parts[1].mime_type)
@@ -235,7 +235,7 @@ class BaseTest < ActiveSupport::TestCase
     swap BaseMailer, :default_implicit_parts_order => order do
       email = BaseMailer.implicit_multipart(:attachments => true).deliver
       assert_equal("application/pdf", email.parts[0].mime_type)
-      assert_equal("multipart/alternate", email.parts[1].mime_type)
+      assert_equal("multipart/alternative", email.parts[1].mime_type)
       assert_equal("text/plain", email.parts[1].parts[1].mime_type)
       assert_equal("text/html", email.parts[1].parts[0].mime_type)
     end
@@ -244,7 +244,7 @@ class BaseTest < ActiveSupport::TestCase
   test "implicit multipart with default locale" do
     email = BaseMailer.implicit_with_locale.deliver
     assert_equal(2, email.parts.size)
-    assert_equal("multipart/alternate", email.mime_type)
+    assert_equal("multipart/alternative", email.mime_type)
     assert_equal("text/plain", email.parts[0].mime_type)
     assert_equal("Implicit with locale TEXT", email.parts[0].body.encoded)
     assert_equal("text/html", email.parts[1].mime_type)
@@ -255,7 +255,7 @@ class BaseTest < ActiveSupport::TestCase
     swap I18n, :locale => :pl do
       email = BaseMailer.implicit_with_locale.deliver
       assert_equal(2, email.parts.size)
-      assert_equal("multipart/alternate", email.mime_type)
+      assert_equal("multipart/alternative", email.mime_type)
       assert_equal("text/plain", email.parts[0].mime_type)
       assert_equal("Implicit with locale PL TEXT", email.parts[0].body.encoded)
       assert_equal("text/html", email.parts[1].mime_type)
@@ -287,7 +287,7 @@ class BaseTest < ActiveSupport::TestCase
   test "explicit multipart" do
     email = BaseMailer.explicit_multipart.deliver
     assert_equal(2, email.parts.size)
-    assert_equal("multipart/alternate", email.mime_type)
+    assert_equal("multipart/alternative", email.mime_type)
     assert_equal("text/plain", email.parts[0].mime_type)
     assert_equal("TEXT Explicit Multipart", email.parts[0].body.encoded)
     assert_equal("text/html", email.parts[1].mime_type)
@@ -310,7 +310,7 @@ class BaseTest < ActiveSupport::TestCase
   test "explicit multipart with attachments creates nested parts" do
     email = BaseMailer.explicit_multipart(:attachments => true).deliver
     assert_equal("application/pdf", email.parts[0].mime_type)
-    assert_equal("multipart/alternate", email.parts[1].mime_type)
+    assert_equal("multipart/alternative", email.parts[1].mime_type)
     assert_equal("text/plain", email.parts[1].parts[0].mime_type)
     assert_equal("TEXT Explicit Multipart", email.parts[1].parts[0].body.encoded)
     assert_equal("text/html", email.parts[1].parts[1].mime_type)
@@ -320,7 +320,7 @@ class BaseTest < ActiveSupport::TestCase
   test "explicit multipart with templates" do
     email = BaseMailer.explicit_multipart_templates.deliver
     assert_equal(2, email.parts.size)
-    assert_equal("multipart/alternate", email.mime_type)
+    assert_equal("multipart/alternative", email.mime_type)
     assert_equal("text/html", email.parts[0].mime_type)
     assert_equal("HTML Explicit Multipart Templates", email.parts[0].body.encoded)
     assert_equal("text/plain", email.parts[1].mime_type)
@@ -330,7 +330,7 @@ class BaseTest < ActiveSupport::TestCase
   test "explicit multipart with any" do
     email = BaseMailer.explicit_multipart_with_any.deliver
     assert_equal(2, email.parts.size)
-    assert_equal("multipart/alternate", email.mime_type)
+    assert_equal("multipart/alternative", email.mime_type)
     assert_equal("text/plain", email.parts[0].mime_type)
     assert_equal("Format with any!", email.parts[0].body.encoded)
     assert_equal("text/html", email.parts[1].mime_type)
@@ -371,6 +371,11 @@ class BaseTest < ActiveSupport::TestCase
     BaseMailer.welcome.deliver
   end
   
+  test "explicit multipart should be multipart" do
+    mail = BaseMailer.explicit_multipart
+    assert_not_nil(mail.content_type_parameters[:boundary])
+  end
+
   protected
 
     # Execute the block setting the given values and restoring old values after