On 8 Sep 2008, at 03:10, Mike Travers wrote:
>
>>> {}.to_json()
> => "{}"
>>> {}.to_json({})
> TypeError: wrong argument type Hash (expected Data)
> from (irb):4:in `to_json'
> from (irb):4
>>>
>
> This is in Ruby 1.8.6, Rails 2.1.1...but for some reason reloading the
> source fixes it:
>
>>> load '/usr/local/lib/ruby/gems/1.8/gems/activesupport-2.1.1/lib/
>>> active_support/json/encoders/hash.rb'
> => []
>>> {}.to_json({})
> => "{}"
>>>
>
> I'm baffled...what's a "Data" and why should to_json be expecting one?
I vaguely recall seeing something similar if you have one of the other
libraries around that provide json conversions - they and
ActiveSupport both try and define to_json and things end up in a mess
when they both try and do it.
Fred
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