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-rw-r--r--actionpack/lib/action_controller/metal/renderers.rb5
1 files changed, 4 insertions, 1 deletions
diff --git a/actionpack/lib/action_controller/metal/renderers.rb b/actionpack/lib/action_controller/metal/renderers.rb
index 0ad9dbeda9..1eab57070f 100644
--- a/actionpack/lib/action_controller/metal/renderers.rb
+++ b/actionpack/lib/action_controller/metal/renderers.rb
@@ -93,7 +93,10 @@ module ActionController
add :json do |json, options|
json = json.to_json(options) unless json.kind_of?(String)
- json = "#{options[:callback]}(#{json})" unless options[:callback].blank?
+ unless options[:callback].blank?
+ json = "#{options[:callback]}(#{json})"
+ self.content_type ||= Mime::JS
+ end
self.content_type ||= Mime::JSON
json
end