我有一个耙子任务从API获取
JSON数据,解析它,并将其保存到数据库：
task :embedly => :environment do
require 'json'
require 'uri'
require 'open-uri'
Video.all.each do |video|
json_stream = open("http://api.embed.ly/1/oembed?key=08b652e6b3ea11e0ae3f4040d3dc5c07&url=#{video.video_url}&maxwidth=525")
ruby_hash = JSON.parse(json_stream.read)
thumbnail_url = ruby_hash['thumbnail_url']
embed_code = ruby_hash['html']
video.update_attributes(:thumbnail_url => thumbnail_url,:embed_code => embed_code)
end
end
当我运行耙子任务时,我在堆栈跟踪中收到这个错误,我不知道是什么原因造成的：
rake aborted! 404 Not Found /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/open-uri.rb:277:in `open_http' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/open-uri.rb:616:in `buffer_open' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/open-uri.rb:164:in `open_loop' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/open-uri.rb:162:in `catch' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/open-uri.rb:162:in `open_loop' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/open-uri.rb:132:in `open_uri' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/open-uri.rb:518:in `open' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/open-uri.rb:30:in `open' /rubyprograms/dreamstill/lib/tasks/tasks.rake:16 /rubyprograms/dreamstill/lib/tasks/tasks.rake:15:in `each' /rubyprograms/dreamstill/lib/tasks/tasks.rake:15 /Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `call' /Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `execute' /Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `each' /Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `execute' /Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:597:in `invoke_with_call_chain' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/monitor.rb:242:in `synchronize'
关于问题的任何想法和如何解决？
解决方法
如果指定的资源(视频/图片)不存在,则embed.ly api返回404. OpenURI将此处理为异常.要抓住错误,你可以这样做：
task :embedly => :environment do
require 'json'
require 'uri'
require 'open-uri'
Video.all.each do |video|
begin
json_stream = open("http://api.embed.ly/1/oembed?key=08b652e6b3ea11e0ae3f4040d3dc5c07&url=#{video.video_url}&maxwidth=525")
ruby_hash = JSON.parse(json_stream.read)
thumbnail_url = ruby_hash['thumbnail_url']
embed_code = ruby_hash['html']
video.update_attributes(:thumbnail_url => thumbnail_url,:embed_code => embed_code)
rescue OpenURI::HTTPError => ex
puts "Handle missing video here"
end
end
end
您也可以在运行任务之前检查视频/网址是否有效.