Undefined method `bytesize' for #<Hash>

Question

I'd like to store and update blogger labels to datastore in GAE. When I run that code, I get this error:

javax.servlet.ServletContext log: Application Error /base/data/home/apps/yet-another-problem/1.334886515480009498/WEB-INF/gems/gems/sinatra-0.9.2/lib/sinatra/base.rb:45:in `each': undefined method `bytesize' for #<Hash:0x86684c> (NoMethodError) 

The Code

class Labels    class LabelData     include Bumble     ds :blog_element_labels    end    def update     response = URLFetch.get($label_url)     result = response.to_s     result_headless = result.gsub("listLabels(",'')     pure_result = result_headless.gsub(");",'')     json_to_yaml = YAML::load(pure_result)['entry']['category']      json_to_yaml.each do |label|     @label = LabelData.find(:blog_element_labels => label['term'])     @label = LabelData.create(:blog_element_labels => label['term']) if @label.nil?     end   end end 

and run by cron job does '/job'

get '/job' do   @labels = Labels.new   @labels.update end 

Where is the problem? Please teach me.

But when run cron job first time, label data was stored, even occur that error. Could not update data.

Answer 1

I think your having the same problem that's been discussed here: error happens when I try "all" method in datamapper

In your case, Sinatra is trying to take the return value of @lavels.update and turn that into a string to display to the user.

Try this to see if it fixes the problem:

get '/job' do   @labels = Labels.new   @labels.update   "Labels Updated" end 

Your return value is now a string, so you shouldn't get the error.