Use Gravatar global configuration settings. Useful if you need to for…

…ce ssl mode.

app/helpers/application_helper.rb

@@ -315,7 +315,6 @@ def avatar_for(model, args = {})
       image_tag(model.avatar.image.url(args[:size]), args)
     else
       args = Avatar.size_from_style!(args) # convert size format :large => '75x75'
-      args = { :gravatar => { :default => 'mm' } }.merge(args)
       gravatar_image_tag(model.email, args)
     end
 

config/initializers/gravatar.rb

@@ -0,0 +1,7 @@
+GravatarImageTag.configure do |config|
+  config.default_image = :mm   # Set this to use your own default gravatar image rather then serving up Gravatar's default image [ 'http://example.com/images/default_gravitar.jpg', :identicon, :monsterid, :wavatar, 404 ].
+  config.filetype      = nil   # Set this if you require a specific image file format ['gif', 'jpg' or 'png'].  Gravatar's default is png
+  config.rating        = nil   # Set this if you change the rating of the images that will be returned ['G', 'PG', 'R', 'X']. Gravatar's default is G
+  config.size          = nil   # Set this to globally set the size of the gravatar image returned (1..512). Gravatar's default is 80
+  config.secure        = false # Set this to true if you require secure images on your pages.
+end