在我向访问者的国家/地区位置进行地理编码的新方法之后，我一直在收到有关我的Rails 4应用程序的NoMethodError报告。
错误报告声明我尝试访问Nil对象的方法
其他信息：
服务器在Nginx＆amp; Phusion Passenger
我一直试图修复这个错误一天没有运气。
以下是所涉及方法的片段：
def set_prefs
if current_user
userPrefs = Preflist.find_by_user_id(current_user.id)
country = Country.find_by_id(userPrefs.country_id)
session[:pref_country_id] = country.id
session[:pref_gender] = userPrefs.gender
else
# This to make sure that the default @country have an object
@country = Country.find_by_name('global')
# Edited if else with unless as suggested by Holger Just
unless Rails.env.test? || Rails.env.development?
@geoCountry = Geocoder.search(request.remote_ip).first.country
unless @geoCountry.blank?
@newCountry = Country.find_by_name(@geoCountry.downcase())
unless @newCountry.blank?
@country = @newCountry
end
end
end
pref_country_id = session[:pref_country_id]
if pref_country_id.nil?
# The only line that request an .id from an Object
session[:pref_country_id] = @country.id
end
pref_gender = session[:pref_gender]
if pref_gender.nil?
session[:pref_gender] = 0
end
end
end
以下是完整报告的示例
A NoMethodError occurred in things#map:
undefined method `id' for nil:NilClass
app/controllers/things_controller.rb:174:in `set_prefs'
# The reported line also keeps on changing, not just 174, which is kind of odd
-------------------------------
Request:
-------------------------------
* URL :
* HTTP Method: GET
* IP address : 66.249.77.53
* Parameters :
* Timestamp : 2014-07-02 16:42:38 +0800
* Server :
* Rails root :
* Process: 12911
-------------------------------
Session:
-------------------------------
* session id: [FILTERED]
* data: #<ActionDispatch::Request::Session:0x422f570 not yet loaded>
-------------------------------
Environment:
-------------------------------
* DOCUMENT_ROOT :
* HTTPS : on
* HTTP_ACCEPT : */*
* HTTP_ACCEPT_ENCODING : gzip,deflate
* HTTP_CONNECTION : Keep-alive
* HTTP_FROM : googlebot(at)googlebot.com
* HTTP_HOST :
* HTTP_USER_AGENT : Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
* ORIGINAL_FULLPATH :
* ORIGINAL_SCRIPT_NAME :
* PASSENGER_APP_ENV : production
* PASSENGER_APP_TYPE : rack
* PASSENGER_CONNECT_PASSWORD : [FILTERED]
* PATH_INFO :
* QUERY_STRING :
* REMOTE_ADDR : 66.249.77.53
* REMOTE_PORT : 42866
* REQUEST_METHOD : GET
* REQUEST_URI :
* ROUTES_33552780_SCRIPT_NAME :
* SCGI : 1
* SCRIPT_NAME :
* SERVER_ADDR :
* SERVER_NAME :
* SERVER_PORT : 443
* SERVER_PROTOCOL : HTTP/1.1
* SERVER_SOFTWARE : nginx/1.4.4
* action_controller.instance : #<ThingsController:0x000000042fdb50>
* action_dispatch.backtrace_cleaner : #<Rails::BacktraceCleaner:0x00000003b86fc0>
* action_dispatch.cookies : #<ActionDispatch::Cookies::CookieJar:0x00000004384768>
* action_dispatch.encrypted_cookie_salt : encrypted cookie
* action_dispatch.encrypted_signed_cookie_salt : signed encrypted cookie
* action_dispatch.http_auth_salt : http authentication
* action_dispatch.key_generator : #<ActiveSupport::CachingKeyGenerator:0x00000003cf5348>
* action_dispatch.logger : #<Logger:0x00000004071c60>
* action_dispatch.parameter_filter : [:password]
* action_dispatch.redirect_filter : []
* action_dispatch.remote_ip : 66.249.77.53
* action_dispatch.request.accepts : [#<Mime::Type:0x000000071052f0 @synonyms=[], @symbol=nil, @string="*/*">]
* action_dispatch.request.content_type :
* action_dispatch.request.formats : [#<Mime::Type:0x000000071052f0 @synonyms=[], @symbol=nil, @string="*/*">]
* action_dispatch.request.parameters :
* action_dispatch.request.path_parameters :
* action_dispatch.request.query_parameters :
* action_dispatch.request.request_parameters : {}
* action_dispatch.request.unsigned_session_cookie: {}
* action_dispatch.request_id : dd13eb0d-dbc9-4093-b7bc-013208ba7dc4
* action_dispatch.routes : #<ActionDispatch::Routing::RouteSet:0x00000003fff318>
* action_dispatch.secret_key_base : 162e9bbc51d7fc7931ade00f2184de5bc3533b3f19d02bef4a2e30e8e67fb8fbe29e6655baa8033ca9fc1a591931c4964d413d57dc825d6bbae9c7e67293f576
* action_dispatch.secret_token :
* action_dispatch.show_detailed_exceptions : false
* action_dispatch.show_exceptions : true
* action_dispatch.signed_cookie_salt : signed cookie
* rack.errors : #<IO:0x00000000aae178>
* rack.hijack : #<Proc:0x000000041b8858@/home/deploy/.rvm/gems/ruby-2.0.0-p353/gems/passenger-4.0.35/lib/phusion_passenger/rack/thread_handler_extension.rb:69 (lambda)>
* rack.hijack? : true
* rack.input : #<PhusionPassenger::Utils::TeeInput:0x00000004186588>
* rack.multiprocess : true
* rack.multithread : false
* rack.request.cookie_hash : {}
* rack.request.query_hash :
* rack.request.query_string :
* rack.run_once : false
* rack.session : #<ActionDispatch::Request::Session:0x0000000422f570>
* rack.session.options : #<ActionDispatch::Request::Session::Options:0x0000000422f098>
* rack.url_scheme : https
* rack.version : [1, 2]
-------------------------------
Backtrace:
-------------------------------
app/controllers/things_controller.rb:174:in `set_prefs'
答案 0 :(得分：0)
经过进一步调查，该错误已得到修复。
每隔5分钟发布的错误报告是由于gem＆＃39; exception_notification＆＃39;无法一次发送多个报告，所以即使在晚些时候说午夜12点，它仍然会发送错误报告，发生在下午4点。
谢谢大家，我为这种困惑道歉。