Question

I’m getting a really strange error message in my app. In my controller I have:

require 'open-uri'
require 'json'
class NoticiasController < ApplicationController
  def index
    url = 'https://api.twitter.com/1/trends/daily.json'
    buffer = open(url, "UserAgent" => "Ruby-Wget").read
    # convert JSON data into a hash
    @result = JSON.parse(buffer)
    end
  end

and in the view I have

<div>
  <% for news in @result['trends'] %> 
  <p><%= news['name'] %></p>
  <% end %>
</div>

but I get “TypeError: can’t convert String into Integer”.

What am I doing wrong?

Answer 1

results['trends'] is a map of timestamp => [trends].

You need to pick a trend date, then iterate over the array of trends.

ruby-1.9.2-p290 :011 > result['trends'].keys.each { |k| puts k }
2011-11-13 17:00
2011-11-13 19:00
2011-11-13 14:00
2011-11-13 16:00
2011-11-13 18:00
2011-11-13 15:00
# etc.

ruby-1.9.2-p290 :022 > result['trends']["2011-11-13 17:00"].each { |t| p t["name"] }; nil
"#myweddingsong"
"#mydivorcesong"
"#ThingsPeopleShouldntDo"
"GOOD LUCK 1D"
# etc.

For example, to get the names of the latest trends:

> ts = result['trends'].keys.sort.last
"2011-11-13 23:00" 
> latest_trend_names = result['trends'][ts].collect { |t| t['name'] }
> latest_trend_names.each { |tn| p tn }
"#myweddingsong"
"#mydivorcesong"
"#ThingsPeopleShouldntDo"
"I'm a Celeb"
"HEADLESS GAGA"
"CHRIS BROWN IS A LEGEND"