_search_results.html.erb

        <% search.results.each do |release| %>
          <div class="col-md-3 release">
            <% cover_url = Record.get_cover_art(release.title) %>
            <%= image_tag cover_url, :class => "coverart" %>
            <%= hidden_field_tag "#{release.id}" %>
            <h5> <%= release.title %> </h5>
            <p> <%= release.label[0] %>, <%= release.label[1] %> </p>
            <p> <%= release.year %> - <%= release.country %> </p>
            <p> <%= release.catno %> </p>
          </div>
        <% end %>

console.log

Started POST "/stores/search_for_record" for 127.0.0.1 at 2015-01-24 12:11:49 -0500
Processing by StoresController#search_for_record as JS
  Parameters: {"utf8"=>"✓", "stores"=>{"artist"=>"Phish", "title"=>"", "catno"=>"", "barcode"=>""}, "commit"=>"Search"}
  User Load (0.3ms)  SELECT  `users`.* FROM `users`  WHERE `users`.`id` = 18 LIMIT 1
"c5b5fbd7-9702-3b16-bcd7-5116220ca401"
nil
"Phish"
"The Story Of The Ghost"
"35cce75c-4fde-3fa5-bd9a-d6dbf0da9cb1"
nil
"Phish"
"The White Tape"
"199014bb-9886-3df4-9e19-9ca955ae5c00"
nil
"Phish"
"A Picture Of Nectar"
"f5c7ae16-cee8-345e-9e0a-cc22ce40b769"
"http://archive.org/download/mbid-87228991-544a-4c60-85d1-71e33097beb9/mbid-87228991-544a-4c60-85d1-71e33097beb9-9453331811.jpg"
"Phish"
"Junta"
"35cce75c-4fde-3fa5-bd9a-d6dbf0da9cb1"
nil
"Phish"
"The White Tape"
"f11dadf8-6631-432e-bf6c-0ccdaf0bf9fd"
nil
"Phish"
"Two Soundchecks"
"98982e44-87af-4126-bfe3-77ef277deab3"
"http://archive.org/download/mbid-6c268c74-7a02-4218-a2a9-d2efe0075b54/mbid-6c268c74-7a02-4218-a2a9-d2efe0075b54-7651185890.jpg"
"Phish"
"Fuego"
"dcc86c28-67f5-30f4-b1c6-1aaf621a99ab"
"http://archive.org/download/mbid-3687a94d-30d7-465b-bb76-83e69fbde310/mbid-3687a94d-30d7-465b-bb76-83e69fbde310-9457701057.jpg"
"Phish"
"Lawn Boy"
"f5c7ae16-cee8-345e-9e0a-cc22ce40b769"
"http://archive.org/download/mbid-87228991-544a-4c60-85d1-71e33097beb9/mbid-87228991-544a-4c60-85d1-71e33097beb9-9453331811.jpg"
"Phish"
"Junta"
"e0c9f2dc-e23a-4b38-b000-4d88d4c4127f"
"http://archive.org/download/mbid-bc6d14ef-c7fa-4910-b0cb-e9c5910d3f0a/mbid-bc6d14ef-c7fa-4910-b0cb-e9c5910d3f0a-9138894438.jpg"
"Phish"
"Party Time"
"4831a0b6-a62c-4995-b01b-29ab2b175aff"
nil
"Phish"
"Joy"
"dcc86c28-67f5-30f4-b1c6-1aaf621a99ab"
"http://archive.org/download/mbid-3687a94d-30d7-465b-bb76-83e69fbde310/mbid-3687a94d-30d7-465b-bb76-83e69fbde310-9457701057.jpg"
"Phish"
"Lawn Boy"
"dcc86c28-67f5-30f4-b1c6-1aaf621a99ab"
"http://archive.org/download/mbid-3687a94d-30d7-465b-bb76-83e69fbde310/mbid-3687a94d-30d7-465b-bb76-83e69fbde310-9457701057.jpg"
"Phish"
"Lawn Boy"
"9778a2aa-34eb-3d0c-8328-32a754b9c6fd"
nil
"Phish"
"Farmhouse"
"f5c7ae16-cee8-345e-9e0a-cc22ce40b769"
"http://archive.org/download/mbid-87228991-544a-4c60-85d1-71e33097beb9/mbid-87228991-544a-4c60-85d1-71e33097beb9-9453331811.jpg"
"Phish"
"Junta"
  Rendered stores/_search_results.html.erb (3351.9ms)
  Rendered stores/search_for_record.js.erb (3353.3ms)
Completed 500 Internal Server Error in 3784ms

ActionView::Template::Error (undefined method `[]' for nil:NilClass):
     6:       <% else %>
     7:         <% search.results.each do |release| %>
     8:           <div class="col-md-3 release">
     9:             <%= image_tag Record.get_cover_art(release.title), :class => "coverart" %>
    10:             <%= hidden_field_tag "#{release.id}" %>
    11:             <h5> <%= release.title %> </h5>
    12:             <p> <%= release.label[0] %>, <%= release.label[1] %> </p>
  app/models/record.rb:9:in `get_cover_art'
  app/views/stores/_search_results.html.erb:9:in `block in _app_views_stores__search_results_html_erb__766828553496209074_70157932801780'
  app/views/stores/_search_results.html.erb:7:in `each'
  app/views/stores/_search_results.html.erb:7:in `_app_views_stores__search_results_html_erb__766828553496209074_70157932801780'
  app/views/stores/search_for_record.js.erb:1:in `_app_views_stores_search_for_record_js_erb___2280576874846375651_70157955039620'


  Rendered /Users/travis/.rvm/gems/ruby-2.1.3@rails416/gems/actionpack-4.1.6/lib/action_dispatch/middleware/templates/rescues/_trace.text.erb (1.1ms)
  Rendered /Users/travis/.rvm/gems/ruby-2.1.3@rails416/gems/actionpack-4.1.6/lib/action_dispatch/middleware/templates/rescues/_request_and_response.text.erb (1.4ms)
  Rendered /Users/travis/.rvm/gems/ruby-2.1.3@rails416/gems/actionpack-4.1.6/lib/action_dispatch/middleware/templates/rescues/template_error.text.erb (15.3ms)

full_trace

Full Trace
app/models/record.rb:9:in `get_cover_art'
app/views/stores/_search_results.html.erb:9:in `block in _app_views_stores__search_results_html_erb__766828553496209074_70157932801780'
app/views/stores/_search_results.html.erb:7:in `each'
app/views/stores/_search_results.html.erb:7:in `_app_views_stores__search_results_html_erb__766828553496209074_70157932801780'
actionview (4.1.6) lib/action_view/template.rb:145:in `block in render'
activesupport (4.1.6) lib/active_support/notifications.rb:161:in `instrument'
actionview (4.1.6) lib/action_view/template.rb:339:in `instrument'
actionview (4.1.6) lib/action_view/template.rb:143:in `render'
actionview (4.1.6) lib/action_view/renderer/partial_renderer.rb:306:in `render_partial'
actionview (4.1.6) lib/action_view/renderer/partial_renderer.rb:279:in `block in render'
actionview (4.1.6) lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument'
activesupport (4.1.6) lib/active_support/notifications.rb:159:in `block in instrument'
activesupport (4.1.6) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (4.1.6) lib/active_support/notifications.rb:159:in `instrument'
actionview (4.1.6) lib/action_view/renderer/abstract_renderer.rb:38:in `instrument'
actionview (4.1.6) lib/action_view/renderer/partial_renderer.rb:278:in `render'
actionview (4.1.6) lib/action_view/renderer/renderer.rb:47:in `render_partial'
actionview (4.1.6) lib/action_view/renderer/renderer.rb:21:in `render'
actionview (4.1.6) lib/action_view/helpers/rendering_helper.rb:32:in `render'
app/views/stores/search_for_record.js.erb:1:in `_app_views_stores_search_for_record_js_erb___2280576874846375651_70157955039620'
actionview (4.1.6) lib/action_view/template.rb:145:in `block in render'
activesupport (4.1.6) lib/active_support/notifications.rb:161:in `instrument'
actionview (4.1.6) lib/action_view/template.rb:339:in `instrument'
actionview (4.1.6) lib/action_view/template.rb:143:in `render'
actionview (4.1.6) lib/action_view/renderer/template_renderer.rb:55:in `block (2 levels) in render_template'
actionview (4.1.6) lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument'
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activesupport (4.1.6) lib/active_support/core_ext/benchmark.rb:12:in `block in ms'
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actionpack (4.1.6) lib/action_controller/metal/implicit_render.rb:5:in `send_action'
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actionpack (4.1.6) lib/abstract_controller/callbacks.rb:20:in `block in process_action'
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activesupport (4.1.6) lib/active_support/callbacks.rb:113:in `call'
activesupport (4.1.6) lib/active_support/callbacks.rb:166:in `block in halting'
activesupport (4.1.6) lib/active_support/callbacks.rb:229:in `call'
activesupport (4.1.6) lib/active_support/callbacks.rb:229:in `block in halting'
activesupport (4.1.6) lib/active_support/callbacks.rb:166:in `call'
activesupport (4.1.6) lib/active_support/callbacks.rb:166:in `block in halting'
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actionpack (4.1.6) lib/action_controller/metal/instrumentation.rb:31:in `block in process_action'
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/Users/travis/.rvm/rubies/ruby-2.1.3/lib/ruby/2.1.0/webrick/server.rb:295:in `block in start_thread'



Request parameters
{"utf8"=>"✓",
 "stores"=>{"artist"=>"Phish",
 "title"=>"",
 "catno"=>"",
 "barcode"=>""},
 "commit"=>"Search"}

Session dump
_csrf_token: "/5wsxEkJ310/UCFwMK9EPui1qoMRFyP+E6TMW7Szdi0="
session_id: "53547500e060fe74a4da60965a51dbca"
user_id: 18

Env dump
GATEWAY_INTERFACE: "CGI/1.1"
HTTP_ACCEPT: "*/*;q=0.5, text/javascript, application/javascript, application/ecmascript, application/x-ecmascript"
HTTP_ACCEPT_ENCODING: "gzip, deflate"
HTTP_ACCEPT_LANGUAGE: "en-US,en;q=0.5"
HTTP_CACHE_CONTROL: "no-cache"
HTTP_PRAGMA: "no-cache"
REMOTE_ADDR: "127.0.0.1"
REMOTE_HOST: "127.0.0.1"
SERVER_NAME: "0.0.0.0"
SERVER_PROTOCOL: "HTTP/1.1"

Response headers
None

record.rb

class << self
    def get_cover_art(release_title)
      artist, title = release_title.split(" - ")
      mbid = MusicBrainz::ReleaseGroup.search(artist, title)
      coverart_archive = CoverArt::Client.new
      cover = coverart_archive.group(mbid.first[:mbid])
      p mbid.first[:mbid]
      p cover
      p artist
      p title
      if cover.blank?
        cover = 'no_cover_available.png'
      else
        return cover
      end
    end
  end