to_json of hash containing an array

[Mads Kristiansen]

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

[Mads Kristiansen]

[Frederick Cheung]

On 24 Aug 2008, at 13:41, Mads Kristiansen wrote:

>
> 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

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[Mads Kristiansen]

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

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

[Vlajbert]

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


On Aug 24, 1:04 pm, Mads Kristiansen <mads.kristian...@nullwire.com>
wrote: