how do you get data from a hash of arrays?

rubyonrails-talk
1

Ok So I am using the calorieking api and it crack as my xml parser (it comes with httparty which is my consumer gem). Now I need to be able to list the food names. How can i get data from a hash that contains arrays? Here is what the hash looks like when pp'ed.

#<HTTParty::Response:0x10368f160 @parsed_response={"searchresults"=>{"category"=>[{"name"=>"Average All Brands", "foods"=>{"food"=>[{"id"=>"f985dcc7-ac8f-4ad5-bbe1-85e71469e023", "display"=>"Breast, meat only, roasted"}, {"id"=>"584917be-3ff3-4165-81c3-46ddb69ac35c", "display"=>"Chicken Egg, whole, hard-boiled"}, {"id"=>"0a067a58-8c3b-4a15-95d0-8cd54fa69401", "display"=>"Chicken Egg, egg white, cooked, no added fat"}, {"id"=>"7b8a89bb-9f43-481a-9e59-750de9c4b98b", "display"=>"Breast, meat only, raw"}, {"id"=>"76de8abd-cd6e-40ab-ae44-2824c9a4576a", "display"=>"Chicken Egg, whole, raw, fresh"}, {"id"=>"dfaf0fe2-0faa-42ae-82a4-b67ab1d3cbf4", "display"=>"Chicken Egg, egg white, hard-boiled"}, {"id"=>"b9d2a52d-e554-4641-b554-d11c3e4442e4", "display"=>"Chicken Egg, egg white, raw, fresh"}, {"id"=>"3f57dc04-2d73-4cb0-b7b8-73352e7299c7", "display"=>"Wing, meat only, fried, edible portion"}, {"id"=>"d981c191-2e80-4991-af90-b674f18daf35", "display"=>"Thigh, meat only, roasted"}, {"id"=>"42e5699f-79cd-436c-965b-90850b26a278", "display"=>"Breast Quarters, rotisserie, no skin or wing (Boston Market)"}, {"id"=>"e04eeaad-801d-454d-b693-6ab306089e50", "display"=>"Breast, meat and skin, roasted"}, {"id"=>"06d4735c-5075-4d8a-bdd9-689471c9bbe6", "display"=>"Leg, meat only, roasted"}, {"id"=>"0915d043-9c44-470d-b1c1-9e9ac934628a", "display"=>"Chicken Egg, egg yolk, raw, fresh"}, {"id"=>"68556c9e-462a-4af1-89cf-04b79a04bdf1", "display"=>"Wing w. meat and skin, roasted"}, {"id"=>"64b4fc73-ec8e-411d-8659-0a990d80a04f", "display"=>"Breast, meat only, stewed"}, {"id"=>"b35f0582-d1e9-4dff-bf64-1495a1f92f51", "display"=>"Breast, meat & skin, fried, batter"}]}}, {"name"=>"McDonald's", "foods"=>{"food"=>[{"id"=>"27dce0ec-8af9-46b0-ad40-ec59a501cdd1", "display"=>"Chicken McNuggets"}, {"id"=>"f1045302-9bb0-4018-9c1c-08f4a292c913", "display"=>"Caesar w. Grilled Chicken, no dressing"}, {"id"=>"4f6a1e64-3dcc-46b9-b981-933d56255fdd", "display"=>"Snack Wraps, Ranch w. Crispy Chicken"}, {"id"=>"67048351-9958-4f4c-b8e7-fb2663549a99", "display"=>"Asian w. Grilled Chicken, no dressing"}, {"id"=>"9a5f059e-6608-42c6-b809-02fb35c8949a", "display"=>"Sandwiches, Premium Grilled, Chicken Classic"}, {"id"=>"3c020ca7-dd6a-438d-be02-c4c4c78b07f6", "display"=>"Snack Wraps, Honey Mustard w.Grilled Chicken"}, {"id"=>"7d59f606-8f68-4ff6-855a-076c32d4d7ec", "display"=>"Bacon Ranch w. Grilled Chicken, no dressing"}, {"id"=>"6167852c-5cff-4342-8df9-696909773b6c", "display"=>"Premium Chicken Breast Filet, Grilled"}, {"id"=>"e8e84c38-1e97-4d45-be1f-ad4d600b8734", "display"=>"Southwest w. Grilled Chicken, no dressing"}, {"id"=>"02ed0335-2aa7-4e38-b489-44eb3cff08af", "display"=>"Snack Wraps, Ranch w. Grilled Chicken"}, {"id"=>"10eaa1d4-2ab3-49d2-97d1-a2c772424690", "display"=>"Chicken Selects, Premium Breast Strips"}]}}, {"name"=>"Burger King", "foods"=>{"food"=>[{"id"=>"de413f0f-dd04-4825-b92d-465439c6cbcc", "display"=>"Garden w. TenderGrill Chicken, no dressing or croutons"}, {"id"=>"5bd48435-bceb-473c-a97d-aea374774db4", "display"=>"Sandwiches, TenderGrill Chicken w. Honey Mustard Sauce"}, {"id"=>"24432f66-bd83-41f6-bb3c-59cd0076c747", "display"=>"Sandwiches, Original Chicken"}]}}]}}, @response=#<Net::HTTPOK 200 OK readbody=true>, @headers={"expires"=>["0"], "last-modified"=>["Thu, 26 Aug 2010 11:58:33 GMT"], "connection"=>["close"], "content-type"=>["application/xml"], "date"=>["Thu, 26 Aug 2010 11:58:33 GMT"], "server"=>["Apache"], "cache-control"=>["pre-check=0, post-check=0, max-age=0"], "pragma"=>["no-cache"], "transfer-encoding"=>["chunked"]}>

2

Ok So I am using the calorieking api and it crack as my xml parser (it comes with httparty which is my consumer gem). Now I need to be able to list the food names. How can i get data from a hash that contains arrays? Here is what the hash looks like when pp'ed.

I'm not entirely sure what you're asking. Iterate over the hash and the arrays it contains with something like each ?

Fred

3

Frederick Cheung wrote:

4

Just an example of how you'd output it in a view, I'm sure you can adapt it from there to extract whatever values you want:

<% @parsed_response[0]['searchresults']['category'].each do |cat| %>   <h1><%=h cat['name']%></h1>   <p>     <h3>Foods</h3>     <% cat['foods']['food'].each do |food| %>       <p><%=h food['id']%> - <%=h food['display']%></p>     <% end %>   </p> <% end %>

5

CU wrote:

Just an example of how you'd output it in a view, I'm sure you can adapt it from there to extract whatever values you want:

<% @parsed_response[0]['searchresults']['category'].each do |cat| %>   <h1><%=h cat['name']%></h1>   <p>     <h3>Foods</h3>     <% cat['foods']['food'].each do |food| %>       <p><%=h food['id']%> - <%=h food['display']%></p>     <% end %>   </p> <% end %>

thanks, but when i do this in the controller i get this error:

You have a nil object when you didn't expect it! You might have expected an instance of ActiveRecord::Base. The error occurred while evaluating nil.

But if i pp @parsed_response its not nill!

thanks

6

That code was the for the view, hence the HTML tags. You'd obviously just use the iterating code without the output in the controller.

7

CU wrote:

That code was the for the view, hence the HTML tags. You'd obviously just use the iterating code without the output in the controller.

Of course I did just that! But i still got the error..

8

Post the code you're using in the controller?

9

That's not necessarily the thing that is nil - for example if for a certain category cat['foods'] didn't exist then you'd get that error

Fred

10

Zack Nathan wrote:

Of course I did just that! But i still got the error..

Well then you are assuming that the wrong thing is nil... perhaps it isn't @parsed_response that is nil. Try working through the issue with irb and seeing what your results are and work through how you'd navigate the results.

All I can say is that it works just fine (accessing the calorieking api and displaying the results), having never looked at their API or used HTTParty before this a.m.

Model:

class Foodq < Object   include HTTParty   basic_auth "84294d7ae4454189bf2a3ebc37a0e421", ""

  def trial_search     self.class.get("http://foodsearch1.webservices.calorieking.com/rest/search/chicken&quot;\)   end end

Controller:

class FoodqsController < ApplicationController   def foods     @foodq = Foodq.new     @response = @foodq.trial_search   end end

View (foods.html.haml - yeah, I use haml, but it's pretty easy to read, and sooooo much nicer to code):

%table{:border => "1", :cellspacing => "1", :cellpadding => "1"}   - @response['searchresults']['category'].each do |cat|     %tr       %td{:colspan => "2"}= h(cat['name'])     - cat['foods']['food'].each do |fd|       %tr         %td= h(fd['id'])         %td= h(fd['display'])

Easy peasy...

11

YOU SAVIOUR! I'll try it out tonight. Thanks sooo much!