NoMethodError - 未定义的方法`id＆＃39;为零：NilClass：

时间：2014-11-13 05:04:16

标签： ruby activerecord sinatra twilio

我在一个包含父/子关系的表中有一堆数字。我有一个名为＆＃39; parent_id＆＃39;我用来匹配父母的号码＆＃39; id＆＃39;柱。问题是，我得到了一个N​​oMethodError - 未定义的方法`id＆＃39;对于nil：NilClass：当试图通过＆parent; id_id＆＃39;

进行查找时

app.rb 

number = Number.find_by_twilio_sid(params[:sid])
forward = Number.find_by_parent_id(number.id)
erb "#{forward.name}"

当我从找到的号码中调用id时，它会被第二行占用。以下是终端回复：

NoMethodError - undefined method `id' for nil:NilClass:
/Users/chadsakonchick/Projects/cloud-phone/lib/voice.rb:52:in `block in <top (required)>'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:1603:in `call'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:1603:in `block in compile!'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:966:in `[]'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:966:in `block (3 levels) in route!'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:985:in `route_eval'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:966:in `block (2 levels) in route!'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:1006:in `block in process_route'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:1004:in `catch'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:1004:in `process_route'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:964:in `block in route!'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:963:in `each'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:963:in `route!'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:1076:in `block in dispatch!'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:1058:in `block in invoke'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:1058:in `catch'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:1058:in `invoke'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:1073:in `dispatch!'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:898:in `block in call!'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:1058:in `block in invoke'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:1058:in `catch'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:1058:in `invoke'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:898:in `call!'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:886:in `call'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/rack-protection-1.5.3/lib/rack/protection/xss_header.rb:18:in `call'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/rack-protection-1.5.3/lib/rack/protection/base.rb:49:in `call'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/rack-protection-1.5.3/lib/rack/protection/base.rb:49:in `call'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/rack-protection-1.5.3/lib/rack/protection/path_traversal.rb:16:in `call'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/rack-protection-1.5.3/lib/rack/protection/json_csrf.rb:18:in `call'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/rack-protection-1.5.3/lib/rack/protection/base.rb:49:in `call'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/rack-protection-1.5.3/lib/rack/protection/base.rb:49:in `call'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/rack-protection-1.5.3/lib/rack/protection/frame_options.rb:31:in `call'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/rack-1.6.0.beta/lib/rack/session/abstract/id.rb:225:in `context'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/rack-1.6.0.beta/lib/rack/session/abstract/id.rb:220:in `call'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/rack-1.6.0.beta/lib/rack/logger.rb:15:in `call'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/rack-1.6.0.beta/lib/rack/commonlogger.rb:33:in `call'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:217:in `call'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:210:in `call'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/rack-1.6.0.beta/lib/rack/head.rb:13:in `call'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/rack-1.6.0.beta/lib/rack/methodoverride.rb:22:in `call'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/show_exceptions.rb:21:in `call'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:180:in `call'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:2014:in `call'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:1478:in `block in call'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:1788:in `synchronize'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:1478:in `call'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/rack-1.6.0.beta/lib/rack/handler/webrick.rb:89:in `service'
/Users/chadsakonchick/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/webrick/httpserver.rb:138:in `service'
/Users/chadsakonchick/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/webrick/httpserver.rb:94:in `run'
/Users/chadsakonchick/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/webrick/server.rb:295:in `block in start_thread'
[2014-11-12 22:44:14] ERROR NoMethodError: undefined method `join' for #<String:0x007fd013edcc28>
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/show_exceptions.rb:37:in `rescue in call'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/show_exceptions.rb:21:in `call'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:180:in `call'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:2014:in `call'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:1478:in `block in call'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:1788:in `synchronize'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/sinatra-1.4.5/lib/sinatra/base.rb:1478:in `call'
/Users/chadsakonchick/.rvm/gems/ruby-2.1.2/gems/rack-1.6.0.beta/lib/rack/handler/webrick.rb:89:in `service'
/Users/chadsakonchick/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/webrick/httpserver.rb:138:in `service'
/Users/chadsakonchick/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/webrick/httpserver.rb:94:in `run'
/Users/chadsakonchick/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/webrick/server.rb:295:in `block in start_thread'
localhost - - [12/Nov/2014:22:44:14 CST] "GET /forward/A9R0cadcba83424fdead5602dzQbb83e61 HTTP/1.1" 500 347
- -> /forward/A9R0cadcba83424fdead5602dzQbb83e61

1 个答案:

答案 0 :(得分：0)

这意味着您Number表中没有指定twilio_sid的条目。

有多种方法可以避免此错误：

一个是：

number = Number.find_by_twilio_sid(params[:sid])
forward_name = Number.find_by_parent_id(number.try(:id)).try(:name)
erb "#{forward_name}"
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