How do you deal with the conflict between ActiveSupport::JSON and the JSON gem?

Posted by Luke Francl on Stack Overflow See other posts from Stack Overflow or by Luke Francl
Published on 2009-03-25T23:51:45Z Indexed on 2010/04/03 23:33 UTC
Read the original article Hit count: 300

Filed under:

ruby

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ruby-on-rails

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JSON

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activesupport

I am stumped with this problem.

ActiveSupport::JSON defines to_json on various core objects and so does the JSON gem. However, the implementation is not the same -- the ActiveSupport version takes arguments and the JSON gem version doesn't.

I installed a gem that required the JSON gem and my app broke. The issue is that I'm using to_json in a controller that returns a list of objects, but I want to control which attributes are returned.

When code anywhere in my system does require 'json' I get this error message:

TypeError: wrong argument type Hash (expected Data)

I tried a couple of things that I read online to fix it, but nothing worked. I ended up re-writing the gem to use ActiveSupport::JSON.decode instead of JSON.parse.

This works but it's not sustainable...I can't be forking gems every time I want to use a gem that requires the JSON gem.

Update: The best solution of this problem is to upgrade to Rails 2.3 or higher, which fixed it.

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