# rails 3.0.9 ArgumentError (redundant UTF-8 sequence): **URL:** \ **Category:** rubyonrails-talk\ **Created:** [July 14, 2011, 8:47am UTC](https://discuss.rubyonrails.org/t/rails-3-0-9-argumenterror-redundant-utf-8-sequence/59856 "2011-07-14T08:47:15Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![11155](https://avatars.discourse-cdn.com/v4/letter/1/d26b3c/32.png) [@11155](https://discuss.rubyonrails.org/u/11155)\ **Post date:** [July 14, 2011, 8:47am UTC](https://discuss.rubyonrails.org/t/rails-3-0-9-argumenterror-redundant-utf-8-sequence/59856/1 "2011-07-14T08:47:15Z")
Hi guys, I have a simple controller   def gmap     @intentsearches = Intentsearch.all     logger.info @intentsearches     respond\_to do |format|       format.html {render :gmap}       format.xml {render :xml =\> @intentsearches }       format.json { render :json =\> @intentsearches }     end   end and want a json response, but i do get the following error Completed 500 Internal Server Error in 107ms ArgumentError (redundant UTF-8 sequence):   app/controllers/intentsearches\_controller.rb:103:in `gmap'   app/controllers/intentsearches_controller.rb:100:in `gmap' Rendered /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.9/lib/action\_dispatch/middleware/templates/rescues/\_trace.erb (1.0ms) Rendered /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.9/lib/action\_dispatch/middleware/templates/rescues/\_request\_and\_response.erb (36.4ms) Rendered /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.9/lib/action\_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (40.7ms) I am sending a http request with only one header param Accept : application/json Does anyone know about this issue? Best, philip ---
**Author:** ![11155](https://avatars.discourse-cdn.com/v4/letter/1/d26b3c/32.png) [@11155](https://discuss.rubyonrails.org/u/11155)\ **Post date:** [July 14, 2011, 10:16am UTC](https://discuss.rubyonrails.org/t/rails-3-0-9-argumenterror-redundant-utf-8-sequence/59856/2 "2011-07-14T10:16:24Z")
Hi, the problem occurs if you have columns with byte data. to exclude them of the serialization is used def serializable\_hash(options=nil)     options ||= {}     options.merge!( :except=\> [:MY\_BYTEDATA\_COLUMN] ) if options[:except].blank?     super(options)   end dc dieci wrote in post #1010652: > Hi guys, I have a simple controller > >   def gmap     @intentsearches = Intentsearch.all     logger.info @intentsearches     respond\_to do |format|       format.html {render :gmap}       format.xml {render :xml =\> @intentsearches }       format.json { render :json =\> @intentsearches }     end   end > > and want a json response, but i do get the following error > > Completed 500 Internal Server Error in 107ms > > ArgumentError (redundant UTF-8 sequence):   app/controllers/intentsearches\_controller.rb:103:in `gmap'   app/controllers/intentsearches_controller.rb:100:in `gmap' > > Rendered /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.9/lib/action\_dispatch/middleware/templates/rescues/\_trace.erb > (1.0ms) Rendered /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.9/lib/action\_dispatch/middleware/templates/rescues/\_request\_and\_response.erb > (36.4ms) Rendered /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.9/lib/action\_dispatch/middleware/templates/rescues/diagnostics.erb > within rescues/layout (40.7ms) > > I am sending a http request with only one header param Accept : application/json > > Does anyone know about this issue? > > Best, > > philip > > update: some more investigation revealed the following. > > when i do call the to\_json method in the console on a single object it all works fine. the error occurs only when i get a collection of objects. > > ArgumentError: redundant UTF-8 sequence       from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.9/lib/active\_support/json/encoding.rb:130:in > `unpack'       from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.9/lib/active\_support/json/encoding.rb:130:in > `escape'       from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.9/lib/active\_support/json/encoding.rb:125:in > `gsub'       from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.9/lib/active\_support/json/encoding.rb:125:in > `escape'       from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.9/lib/active\_support/json/encoding.rb:68:in > `escape'       from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.9/lib/active\_support/json/encoding.rb:173:in > `encode\_json'       from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.9/lib/active\_support/json/encoding.rb:47:in > `encode'       from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.9/lib/active\_support/json/encoding.rb:77:in > `check\_for\_circular\_references'       from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.9/lib/active\_support/json/encoding.rb:45:in > `encode'       from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.9/lib/active\_support/json/encoding.rb:247:in > `encode_json'       from (irb):26:in `map'       from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.9/lib/active\_support/json/encoding.rb:247:in > `each'       from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.9/lib/active\_support/json/encoding.rb:247:in > `map'       from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.9/lib/active\_support/json/encoding.rb:247:in > `encode\_json'       from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.9/lib/active\_support/json/encoding.rb:47:in > `encode'       from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.9/lib/active\_support/json/encoding.rb:77:in > `check\_for\_circular\_references'       from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.9/lib/active\_support/json/encoding.rb:45:in > `encode'       from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.9/lib/active\_support/json/encoding.rb:247:in > `encode_json'       from (irb):26:in `map'       from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.9/lib/active\_support/json/encoding.rb:247:in > `each'       from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.9/lib/active\_support/json/encoding.rb:247:in > `map'       from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.9/lib/active\_support/json/encoding.rb:247:in > `encode\_json'       from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.9/lib/active\_support/json/encoding.rb:214:in > `encode\_json'       from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.9/lib/active\_support/json/encoding.rb:214:in > `map'       from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.9/lib/active\_support/json/encoding.rb:214:in > `encode\_json'       from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.9/lib/active\_support/json/encoding.rb:47:in > `encode'       from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.9/lib/active\_support/json/encoding.rb:77:in > `check\_for\_circular\_references'       from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.9/lib/active\_support/json/encoding.rb:45:in > `encode'       from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.9/lib/active\_support/json/encoding.rb:30:in > `encode'       from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.9/lib/active\_support/core\_ext/object/to\_json.rb:15:in