Question

I’m on Rails 3.1

I’ve pasted an example below, but Calling to_xml on any model throws this error. I’ve tried everything but I’m it’s the sort of thing someone would have seen before. Does it ring any bells for anyone?

1.8.7 :004 > Person.first.to_xml
  Person Load (2.0ms)  SELECT `people`.* FROM `people` LIMIT 1
ArgumentError: wrong number of arguments (1 for 0)
    from /home/khughes/.rvm/gems/ree-1.8.7-2012.02@rails31/gems/builder-3.0.0/lib/builder/xmlbase.rb:135:in `to_xs'
    from /home/khughes/.rvm/gems/ree-1.8.7-2012.02@rails31/gems/builder-3.0.0/lib/builder/xmlbase.rb:135:in `_escape'
    from /home/khughes/.rvm/gems/ree-1.8.7-2012.02@rails31/gems/builder-3.0.0/lib/builder/xmlbase.rb:140:in `_escape_quote'
    from /home/khughes/.rvm/gems/ree-1.8.7-2012.02@rails31/gems/builder-3.0.0/lib/builder/xmlmarkup.rb:320:in `_attr_value'
    from /home/khughes/.rvm/gems/ree-1.8.7-2012.02@rails31/gems/builder-3.0.0/lib/builder/xmlmarkup.rb:308:in `_insert_attributes'
    from /home/khughes/.rvm/gems/ree-1.8.7-2012.02@rails31/gems/builder-3.0.0/lib/builder/xmlmarkup.rb:306:in `each'
    from /home/khughes/.rvm/gems/ree-1.8.7-2012.02@rails31/gems/builder-3.0.0/lib/builder/xmlmarkup.rb:306:in `_insert_attributes'
    from /home/khughes/.rvm/gems/ree-1.8.7-2012.02@rails31/gems/builder-3.0.0/lib/builder/xmlmarkup.rb:284:in `_special'
    from /home/khughes/.rvm/gems/ree-1.8.7-2012.02@rails31/gems/builder-3.0.0/lib/builder/xmlmarkup.rb:250:in `instruct!'
    from /home/khughes/.rvm/gems/ree-1.8.7-2012.02@rails31/gems/activemodel-3.1.1/lib/active_model/serializers/xml.rb:93:in `serialize'
    from /home/khughes/.rvm/gems/ree-1.8.7-2012.02@rails31/gems/activerecord-3.1.1/lib/active_record/serializers/xml_serializer.rb:175:in `to_xml'
    from (irb):4

Answer 1

had the same issue some time ago, do you have hpricot gem bundled into the project? if so, try to remove it from the Gemfile, run bundle and check if to_xml works

there’s a solution that worked for me:
https://github.com/hpricot/hpricot/issues/53 ( see smeevil‘s post )