Problems with parsing JSON POST body

[jbrennan]

I'm quite amatuerish with Ruby and Sinatra so please stay with me.
I've got a very simple Sinatra app and I'm POSTing a JSON object from
my client app (iPhone). Here's what my route looks like.

post '/changes' do
puts "Got a hit"
body = JSON.parse(request.body.read.to_s) # now contains a valid
json object of the POST body
local_changes_array = body["LocalChangesArray"] #
"LocalChangesArray" is a valid key in my object
end

However, when I post the data to the server, I get the following error
on the last line:

> NoMethodError: undefined method `bytesize' for #<Hash:0x102023ca0>

followed by a lengthy stack trace.

I'm not sure why "body" (which is my parsed JSON hash) is giving me
that error when I try to access it with a key. I've checked (via puts)
that the json object is arriving as expected.

I'm at a complete loss, any help would be immensely appreciated!
Jason.

[nouse]

On Jul 23, 9:33 am, jbrennan <i.jasonbren...@gmail.com> wrote:

>
> I'm not sure why "body" (which is my parsed JSON hash) is giving me
> that error when I try to access it with a key. I've checked (via puts)
> that the json object is arriving as expected.
>
> I'm at a complete loss, any help would be immensely appreciated!
> Jason.

That is exactly the reason. In line 84 of sinatra/base.rb defines the
body method, it will set response's body.

# Set or retrieve the response body. When a block is given,
# evaluation is deferred until the body is read with #each.
def body(value=nil, &block)
if block_given?
def block.each ; yield call ; end
response.body = block
else
response.body = value
end
end

[jbrennan]

I should amend my original question. I've since changed the name of my
variable, but I cannot seem to parse the request body to a json
object. So my code looks like so:

post '/changes' do
puts "Got a hit"

bodyJSON = JSON.parse(request.body.read.to_s) # now contains a

valid
json object of the POST body

local_changes_array = bodyJSON["LocalChangesArray"] #

"LocalChangesArray" is a valid key in my object
end

Yet I still get this error: NoMethodError: undefined method `bytesize'
for #<Hash:0x1021f33a0>

Ideas? Am I somehow not accessing the body of my POST properly? I've
set the content-type of my POST request to "application/json", but I
have a feeling like I'm just not getting the post body properly. Could
it have something to do with the json quotes not being escaped or
something?

Jason.

[Patrick Bacon]

Try this:

JSON.parse(request.env["rack.input"].read)

- Patrick

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[Damian Janowski]

On Fri, Jul 23, 2010 at 1:19 AM, jbrennan <i.jason...@gmail.com> wrote:
> I should amend my original question. I've since changed the name of my
> variable, but I cannot seem to parse the request body to a json
> object. So my code looks like so:
>
> post '/changes' do
>  puts "Got a hit"
>  bodyJSON = JSON.parse(request.body.read.to_s) # now contains a
> valid
> json object of the POST body
>  local_changes_array = bodyJSON["LocalChangesArray"] #
> "LocalChangesArray" is a valid key in my object
> end
>
> Yet I still get this error: NoMethodError: undefined method `bytesize'
> for #<Hash:0x1021f33a0>
>
> Ideas? Am I somehow not accessing the body of my POST properly? I've
> set the content-type of my POST request to "application/json", but I
> have a feeling like I'm just not getting the post body properly. Could
> it have something to do with the json quotes not being escaped or
> something?

The return value of the block is what Sinatra will send back as the
response body.

Try:

post "/changes" do
# ...
local_changes_array = bodyJSON["LocalChangesArray"]
local_changes_array.to_json
end

[Konstantin Haase]

On Jul 23, 2010, at 12:41 , Patrick Bacon wrote:

> Try this:
>
> JSON.parse(request.env["rack.input"].read)
>
> - Patrick

You should do a request.env["rack.input"].rewind first.

Konstantin

[jbrennan]

Got it working.

Thanks all!!