导轨:未定义的方法“to_sym”
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20-09-2019 - |
题
我在部署的 Rails 2.3.5 应用程序中收到以下错误:
NoMethodError(nil:NilClass 的未定义方法“to_sym”):
我的应用程序的本地测试安装(使用 Sqlite)不会出现错误,但我部署的运行 Mysql 的应用程序会出现错误。两者之间唯一的区别是我在本地计算机上运行 Ruby 1.8.7,在部署服务器上运行 Ruby 1.8.6。
我已包含 User.rb 中的代码和下面的错误日志。我按照声明性授权和嵌入式授权 Railscast 进行了设置。
任何帮助将不胜感激!
编辑:这是 application_controller 的代码,我在其中使用 before_filter 设置 current_user :
class ApplicationController < ActionController::Base
helper :all
helper_method :current_user_session, :current_user
before_filter :set_current_user
protected
def set_current_user
Authorization.current_user = current_user
end
def current_user_session
return @current_user_session if defined?(@current_user_session)
@current_user_session = UserSession.find
end
def current_user
@current_user = current_user_session && current_user_session.record
end
end
--
用户.rb:
class User < ActiveRecord::Base
acts_as_authentic
has_many :products
has_many :transactions
ROLES = %w[admin dmstaff staff faculty]
def role_symbols
[role.to_sym]
end
end
错误日志:
NoMethodError (undefined method `to_sym' for nil:NilClass):
app/models/user.rb:10:in `role_symbols'
/usr/lib/ruby/gems/1.8/gems/declarative_authorization 0.4/lib/declarative_authorization/authorization.rb:242:in `roles_for'
/usr/lib/ruby/gems/1.8/gems/declarative_authorization-0.4/lib/declarative_authorization/authorization.rb:296:in `user_roles_privleges_from_options'
/usr/lib/ruby/gems/1.8/gems/declarative_authorization-0.4/lib/declarative_authorization/authorization.rb:161:in `permit!'
/usr/lib/ruby/gems/1.8/gems/declarative_authorization-0.4/lib/declarative_authorization/in_controller.rb:580:in `permit!'
/usr/lib/ruby/gems/1.8/gems/declarative_authorization-0.4/lib/declarative_authorization/in_controller.rb:109:in `filter_access_filter'
/usr/lib/ruby/gems/1.8/gems/declarative_authorization-0.4/lib/declarative_authorization/in_controller.rb:109:in `each'
/usr/lib/ruby/gems/1.8/gems/declarative_authorization-0.4/lib/declarative_authorization/in_controller.rb:109:in `all?'
/usr/lib/ruby/gems/1.8/gems/declarative_authorization-0.4/lib/declarative_authorization/in_controller.rb:109:in `filter_access_filter'
passenger (2.2.5) lib/phusion_passenger/rack/request_handler.rb:95:in `process_request'
passenger (2.2.5) lib/phusion_passenger/abstract_request_handler.rb:207:in `main_loop'
passenger (2.2.5) lib/phusion_passenger/railz/application_spawner.rb:378:in `start_request_handler'
passenger (2.2.5) lib/phusion_passenger/railz/application_spawner.rb:336:in `handle_spawn_application'
passenger (2.2.5) lib/phusion_passenger/utils.rb:183:in `safe_fork'
passenger (2.2.5) lib/phusion_passenger/railz/application_spawner.rb:334:in `handle_spawn_application'
passenger (2.2.5) lib/phusion_passenger/abstract_server.rb:352:in `__send__'
passenger (2.2.5) lib/phusion_passenger/abstract_server.rb:352:in `main_loop'
passenger (2.2.5) lib/phusion_passenger/abstract_server.rb:196:in `start_synchronously'
passenger (2.2.5) lib/phusion_passenger/abstract_server.rb:163:in `start'
passenger (2.2.5) lib/phusion_passenger/railz/application_spawner.rb:213:in `start'
passenger (2.2.5) lib/phusion_passenger/spawn_manager.rb:262:in `spawn_rails_application'
passenger (2.2.5) lib/phusion_passenger/abstract_server_collection.rb:126:in `lookup_or_add'
passenger (2.2.5) lib/phusion_passenger/spawn_manager.rb:256:in `spawn_rails_application'
passenger (2.2.5) lib/phusion_passenger/abstract_server_collection.rb:80:in `synchronize'
passenger (2.2.5) lib/phusion_passenger/abstract_server_collection.rb:79:in `synchronize'
passenger (2.2.5) lib/phusion_passenger/spawn_manager.rb:255:in `spawn_rails_application'
passenger (2.2.5) lib/phusion_passenger/spawn_manager.rb:154:in `spawn_application'
passenger (2.2.5) lib/phusion_passenger/spawn_manager.rb:287:in `handle_spawn_application'
passenger (2.2.5) lib/phusion_passenger/abstract_server.rb:352:in `__send__'
passenger (2.2.5) lib/phusion_passenger/abstract_server.rb:352:in `main_loop'
passenger (2.2.5) lib/phusion_passenger/abstract_server.rb:196:in `start_synchronously'
Rendering /var/data/app/current/public/500.html (500 Internal Server Error)
解决方案
def role_symbols
[role.to_sym]
end
-> role
是 Nil
.你定义 role
什么地方?
其他提示
在某些时候,您的代码需要一个类型的对象 User
, ,但正在得到 nil
反而。你在做这样的事吗?
@user = User.find_by_login("Mary")
@user.role_symbols
其中,“Mary”是一个不存在的用户登录名?发布您调用 role_symbols 方法的任何位置,我们可以提供更多帮助。
编辑: 查看方法#roles_for 这里, ,在不深入研究该插件的情况下,我会说 #current_user 在代码执行的此时尚未设置。
角色属性尚未设置在桌子上。你必须使用一个救援代码,并检查为什么会这样。
测试,如果 '角色' 值被呼叫role.to_sym之前设置好的。
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