Question

I’m trying to debug a problem where Rails isn’t decoding the JSON POST data.

The server logs show:

2011-12-14T06:44:44+00:00 app[web.2]: Started POST 
2011-12-14T06:44:44+00:00 app[web.2]:   Processing by PostsController#create as */*
2011-12-14T06:44:44+00:00 app[web.2]:   Parameters: {"{\"athlete_id\":\"\",\"known_as\":\"abc\",\"email\":\"[e-mail]\",\"result\":\"112233\",\"rx\":false,\"mods\":\"thkjth\",\"notes\":\"\"}"=>nil, "affiliate_id"=>"testaffiliate", "wod_id"=>"12345"}

Note that the JSON string is not being parsed – Rails is assigning it as a key in the hash, pointing to a nil value. Does anyone have any ideas before I write a before_filter that tries to JSON.parse all of the params keys?

I don’t think this is relevant since I’m sending and receiving data okay, but this problem occurs during a CORS Request from IE (using XDomainRequest).

Answer 1

before_filter :fix_ie_params, only: [:create, :update]

For Thin:

def fix_ie_params
  if request.format == '*/*'
    # try to JSON decode in case of IE XDR
    begin

      params.merge! ActiveSupport::JSON.decode(request.body.string)

    rescue Exception=>e
      # todo: log exception
    end
  end
end

For Unicorn and Phusion Passenger:

def fix_ie_params
  if request.format == '*/*'
    # try to JSON decode in case of IE XDR
    begin

      request.body.rewind
      params.merge! ActiveSupport::JSON.decode(request.body.read)

    rescue Exception=>e
      # todo: log exception
    end
  end
end