in ur example data there are only 3 items in the "result" and the element of
"count" has a value of 52
in ur for-loop u will access 3-51 ones which do not exist
u may use table["results"].size instead of table["count"]

2010/8/12 Samuel Sternhagen <samatoms / gmail.com>

> I am trying to work with the Etsy API. I make a HTTP request and get
> data back in json format. I call JSON.parse(table) and the parse method
> returns the data in something that appears to be a hash.
>
> Here is a simplified version of what JSON.parse(table) returns:
>
> {"results"=>[{"name"=>"getMethodTable", "uri"=>"/",
> "http_method"=>"GET", "type"=>"method", "defaults"=>nil, "params"=>nil,
> "description"=>"Get a list of all methods available.",
> "visibility"=>"public"}, {"name"=>"getSubCategory",
> "uri"=>"/categories/:tag/:subtag", "http_method"=>"GET",
> "type"=>"Category", "defaults"=>nil, "params"=>{"subtag"=>"string",
> "tag"=>"string"}, "description"=>"Retrieves a second-level Category by
> tag and subtag.", "visibility"=>"public"}, {"name"=>"getSubSubCategory",
> "uri"=>"/categories/:tag/:subtag/:subsubtag", "http_method"=>"GET",
> "type"=>"Category", "defaults"=>nil, "params"=>{"subtag"=>"string",
> "tag"=>"string", "subsubtag"=>"string"}, "description"=>"Retrieves a
> third-level Category by tag, subtag and subsubtag.",
> "visibility"=>"public"}], "type"=>"method", "count"=>52, "params"=>nil}
>
> I am trying to access each of these hashes and each of the sub hashes. I
> do not think that I am using the correct syntax.
>
> I can get some of the values by refering to:
>
> table["results"][i] # then iterate through i
>
> This is the code I use to access the key value pairs.
>
> require 'rubygems'
> require 'json'
> require 'net/http'
>
> class MethodTable  # returns hash containing results from Etsy's API
> method: getMethodTable
>   def get_table
>      url = "http://openapi.etsy.com/v2/sandbox/public/?api_key=my_key"
>      url = URI.parse(url)
>      method_list = Net::HTTP.get(url)
>   end
> end
>
> method_table = MethodTable.new
> table = method_table.get_table
> table = JSON.parse(table)
>
> i = 1
>
> while (i <= table["count"])
>
>   table["results"][i].each do |key, value|
>      print "#{key} => #{value}\n"
>   end
> i += 1
> end
>
> table.rb:21: undefined method `each' for nil:NilClass (NoMethodError)
>
> How can I use `each' without and error? How can I access the sub-hashes
> such as the hash of parameters seen below?
>
> "params"=>{"subtag"=>"string", "tag"=>"string", "subsubtag"=>"string"}
>
>
> Thanks,
>
> Sam
> --
> Posted via http://www.ruby-forum.com/.
>
>