Templates have one format

Templates only have one format.  Before this commit, templates would be
constructed with a single element array that contained the format.  This
commit eliminates the single element array and just implements a
`format` method.  This saves one array allocation per template.

1 files changed, 2 insertions, 2 deletions

diff --git a/actionmailer/lib/action_mailer/base.rb b/actionmailer/lib/action_mailer/base.rb
index 033a7f5b9e..52360d40fe 100644
--- a/actionmailer/lib/action_mailer/base.rb
+++ b/actionmailer/lib/action_mailer/base.rb
@@ -973,7 +973,7 @@ module ActionMailer
         templates_name = headers[:template_name] || action_name
 
         each_template(Array(templates_path), templates_name).map do |template|
-          self.formats = template.formats
+          self.formats = [template.format]
           {
             body: render(template: template),
             content_type: template.type.to_s
@@ -986,7 +986,7 @@ module ActionMailer
         if templates.empty?
           raise ActionView::MissingTemplate.new(paths, name, paths, false, "mailer")
         else
-          templates.uniq(&:formats).each(&block)
+          templates.uniq(&:format).each(&block)
         end
       end