to_json of hash containing an array

rubyonrails-talk
1

Hi there,

I am fairly new to the Rails framework, so forgive me if there is an obvious solution to this problem.

I am using Rails 2.1.0 and trying to jsonify a hash containing an array. E.g.

result = { :name => "McLovin", :attachments => ['file.pdf', 'file.jpg'] } => {:attachments=>["file.pdf", "file.jpg"], :name=>"McLovin"} result.to_json

I would expect something like:

{    "name": "McLovin",    "attachments": [        "file.pdf",        "file.jpg"    ] }

But instead I get:

TypeError: wrong argument type Hash (expected Data)   from /Library/Ruby/Gems/1.8/gems/activesupport-2.1.0/lib/ active_support/json/encoding.rb:21:in `to_json'   from /Library/Ruby/Gems/1.8/gems/activesupport-2.1.0/lib/ active_support/json/encoding.rb:21:in `send'   from /Library/Ruby/Gems/1.8/gems/activesupport-2.1.0/lib/ active_support/json/encoding.rb:21:in `encode'   from /Library/Ruby/Gems/1.8/gems/activesupport-2.1.0/lib/ active_support/json/encoding.rb:31:in `raise_on_circular_reference'   from /Library/Ruby/Gems/1.8/gems/activesupport-2.1.0/lib/ active_support/json/encoding.rb:20:in `encode'   from /Library/Ruby/Gems/1.8/gems/activesupport-2.1.0/lib/ active_support/json/encoders/hash.rb:42:in `to_json'   from /Library/Ruby/Gems/1.8/gems/activesupport-2.1.0/lib/ active_support/json/encoders/hash.rb:41:in `map'   from /Library/Ruby/Gems/1.8/gems/activesupport-2.1.0/lib/ active_support/json/encoders/hash.rb:41:in `to_json'   from /Library/Ruby/Gems/1.8/gems/activesupport-2.1.0/lib/ active_support/core_ext/object/misc.rb:28:in `returning'   from /Library/Ruby/Gems/1.8/gems/activesupport-2.1.0/lib/ active_support/json/encoders/hash.rb:40:in `to_json'   from (irb):54

If I do "result.to_json( :except => :attachments )", then it works.

Best regards, Mads Kristiansen

2

Hi there,

I am fairly new to the Rails framework, so forgive me if there is an obvious solution to this problem.

I am using Rails 2.1.0 and trying to jsonify a hash containing an array. E.g.

result = { :name => "McLovin", :attachments => ['file.pdf', 'file.jpg'] } => {:attachments=>["file.pdf", "file.jpg"], :name=>"McLovin"} result.to_json

I would expect something like:

{   "name": "McLovin",   "attachments": [       "file.pdf",       "file.jpg"   ] }

Which is exactly what I got when I tried this out. Do you have any plugins/use any gems that could be clashing with activesupport's JSON stuff?

Fred

3

Okay, thanks. Just wanted to confirm that it actually worked
somewhere.. :slight_smile:

I removed the "json_pure" gem and now it works for me too.. Not sure
if that will cause other problems, but we'll see about that.

Best regards, Mads Kristiansen

4

This is also a problem in Merb. I believe AR's json and Merb's json don't play well together. I put this in init.rb and now life is grand.

Merb.disable :json