私は、複数のサブディレクトリのjsonページをリクエストし、大学プロジェクトの各ページのタイトルとリンクを取得しようとしています。問題のコードは次のとおりです。reddit apiを解析するときの未定義のメソッド[] "
require 'rufus-scheduler'
require 'json'
require 'httparty'
ENV['TZ'] = 'Europe/Dublin'
scheduler = Rufus::Scheduler::singleton
scheduler.every '12h00m', :first_at => Time.now + 10 do
array_of_subreddits = ["pics", "memes", "funny", "aww", "memes",
"birdswitharms"]
array_of_subreddits.each do |category|
sleep 10 #wait 10 seconds between each request
@response = JSON.parse(HTTParty.get("http://reddit.com/r/#{category}/.json?limit=25").body)
@response['data']['children'].each do |data|
@link = data['data']['url']
@title = data['data']['title']
@category = category
Pic.create([{:title => "#{@title}", :link => "#{@link}", :category => "#{@category}"}])
end
end
end
これは完全に動作することがあります。 1または2回通過した後、後に、より頻繁にではないが、それは私にこのメッセージを与えるより:
NoMethodError (undefined method `[]' for nil:NilClass):
app/controllers/home_controller.rb:17:in `block in index'
app/controllers/home_controller.rb:9:in `each'
app/controllers/home_controller.rb:9:in `index'
Rendered /Users/conorbreen/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/actionpack-4.2.6/lib/action_dispatch/middleware/templates/rescues/_source.erb (4.8ms)
Rendered /Users/conorbreen/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/actionpack-4.2.6/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb (2.2ms)
Rendered /Users/conorbreen/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/actionpack-4.2.6/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb (1.2ms)
Rendered /Users/conorbreen/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/actionpack-4.2.6/lib/action_dispatch/middleware/templates/rescues/diagnostics.html.erb within rescues/layout (66.2ms)
Rendered /Users/conorbreen/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/web-console-2.3.0/lib/web_console/templates/_markup.html.erb (0.4ms)
Rendered /Users/conorbreen/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/web-console-2.3.0/lib/web_console/templates/_inner_console_markup.html.erb within layouts/inlined_string (0.3ms)
Rendered /Users/conorbreen/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/web-console-2.3.0/lib/web_console/templates/_prompt_box_markup.html.erb within layouts/inlined_string (0.3ms)
Rendered /Users/conorbreen/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/web-console-2.3.0/lib/web_console/templates/style.css.erb within layouts/inlined_string (0.5ms)
Rendered /Users/conorbreen/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/web-console-2.3.0/lib/web_console/templates/console.js.erb within layouts/javascript (51.6ms)
Rendered /Users/conorbreen/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/web-console-2.3.0/lib/web_console/templates/main.js.erb within layouts/javascript (0.3ms)
Rendered /Users/conorbreen/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/web-console-2.3.0/lib/web_console/templates/error_page.js.erb within layouts/javascript (0.5ms)
Rendered /Users/conorbreen/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/web-console-2.3.0/lib/web_console/templates/index.html.erb (124.8ms)
のようにあなたは、HTTPコールを作っています。 '@response ['data']'がnilであるため、Redditでレートリミットやその他のサービスエラーが発生する可能性は非常に高いです。あなたのスクリプトを効率的にするために、 '@response ['data']'と '@response ['data'] ['children']'のhttp応答/存在を確認してください。 – kiddorails
'HTTParty.get(...)'が成功したと盲信してはいけません。それを変数 'response = HTTParty.get(...)'に割り当て、データを処理する前に 'response.success?'か 'response.code'をチェックしてください。 – Stefan