undefined局部变量或方法`user_params’trail 4

undefined local variable or method `user_params' rails 4

所以我按照"从头开始验证"的轨道进行了操作 - http://railscasts.com/episodes/250-authentication-from-scratch

我知道rails 4不使用attr_accessible。我在我的用户控制器中将user_params定义为私有方法。出于某种原因，rails给了我一个用户参数的未定义错误。我正在开发另一个rails应用程序，我检查了它中的post控制器。除了工作之外，它完全一样。知道这里的问题是什么吗？

users_controller.rb

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class UsersController < ApplicationController
def new
@user = User.new
end

def create
@user = User.create(user_params)
if @user.save
redirect_to root_url, :notice =>"Signed up!"
else
render"new"
end
private

def user_params
params.require(:user).permit(:email, :password, :password_confirmation)
end

错误信息：
未定义的局部变量或方法`user_params'for＃

完整堆栈跟踪：

app/controllers/users_controller.rb:7:in create' actionpack (4.1.1)
lib/action_controller/metal/implicit_render.rb:4:insend_action'
actionpack (4.1.1) lib/abstract_controller/base.rb:189:in
process_action' actionpack (4.1.1)
lib/action_controller/metal/rendering.rb:10:inprocess_action'
actionpack (4.1.1) lib/abstract_controller/callbacks.rb:20:in block
in process_action' activesupport (4.1.1)
lib/active_support/callbacks.rb:113:incall' activesupport (4.1.1)
lib/active_support/callbacks.rb:113:in call' activesupport (4.1.1)
lib/active_support/callbacks.rb:229:inblock in halting'
activesupport (4.1.1) lib/active_support/callbacks.rb:229:in call'
activesupport (4.1.1) lib/active_support/callbacks.rb:229:inblock in
halting' activesupport (4.1.1) lib/active_support/callbacks.rb:166:in
call' activesupport (4.1.1) lib/active_support/callbacks.rb:166:in
block in halting' activesupport (4.1.1)
lib/active_support/callbacks.rb:166:in call' activesupport (4.1.1)
lib/active_support/callbacks.rb:166:inblock in halting'
activesupport (4.1.1) lib/active_support/callbacks.rb:166:in call'
activesupport (4.1.1) lib/active_support/callbacks.rb:166:inblock in
halting' activesupport (4.1.1) lib/active_support/callbacks.rb:86:in
call' activesupport (4.1.1) lib/active_support/callbacks.rb:86:in
run_callbacks' actionpack (4.1.1)
lib/abstract_controller/callbacks.rb:19:in process_action' actionpack
(4.1.1) lib/action_controller/metal/rescue.rb:29:inprocess_action'
actionpack (4.1.1)
lib/action_controller/metal/instrumentation.rb:31:in block in
process_action' activesupport (4.1.1)
lib/active_support/notifications.rb:159:inblock in instrument'
activesupport (4.1.1)
lib/active_support/notifications/instrumenter.rb:20:in instrument'
activesupport (4.1.1) lib/active_support/notifications.rb:159:in
instrument' actionpack (4.1.1)
lib/action_controller/metal/instrumentation.rb:30:in process_action'
actionpack (4.1.1)
lib/action_controller/metal/params_wrapper.rb:250:inprocess_action'
activerecord (4.1.1)
lib/active_record/railties/controller_runtime.rb:18:in
process_action' actionpack (4.1.1)
lib/abstract_controller/base.rb:136:inprocess' actionview (4.1.1)
lib/action_view/rendering.rb:30:in process' actionpack (4.1.1)
lib/action_controller/metal.rb:195:indispatch' actionpack (4.1.1)
lib/action_controller/metal/rack_delegation.rb:13:in dispatch'
actionpack (4.1.1) lib/action_controller/metal.rb:231:inblock in
action' actionpack (4.1.1)
lib/action_dispatch/routing/route_set.rb:80:in call' actionpack
(4.1.1) lib/action_dispatch/routing/route_set.rb:80:indispatch'
actionpack (4.1.1) lib/action_dispatch/routing/route_set.rb:48:in
call' actionpack (4.1.1) lib/action_dispatch/journey/router.rb:71:in
block in call' actionpack (4.1.1)
lib/action_dispatch/journey/router.rb:59:in each' actionpack (4.1.1)
lib/action_dispatch/journey/router.rb:59:incall' actionpack (4.1.1)
lib/action_dispatch/routing/route_set.rb:676:in call' rack (1.5.2)
lib/rack/etag.rb:23:incall' rack (1.5.2)
lib/rack/conditionalget.rb:35:in call' rack (1.5.2)
lib/rack/head.rb:11:incall' actionpack (4.1.1)
lib/action_dispatch/middleware/params_parser.rb:27:in call'
actionpack (4.1.1) lib/action_dispatch/middleware/flash.rb:254:in
call' rack (1.5.2) lib/rack/session/abstract/id.rb:225:in context'
rack (1.5.2) lib/rack/session/abstract/id.rb:220:incall' actionpack
(4.1.1) lib/action_dispatch/middleware/cookies.rb:560:in call'
activerecord (4.1.1) lib/active_record/query_cache.rb:36:incall'
activerecord (4.1.1)
lib/active_record/connection_adapters/abstract/connection_pool.rb:621:in
call' activerecord (4.1.1) lib/active_record/migration.rb:380:in
call' actionpack (4.1.1)
lib/action_dispatch/middleware/callbacks.rb:29:in block in call'
activesupport (4.1.1) lib/active_support/callbacks.rb:82:in
run_callbacks' actionpack (4.1.1)
lib/action_dispatch/middleware/callbacks.rb:27:in call' actionpack
(4.1.1) lib/action_dispatch/middleware/reloader.rb:73:incall'
actionpack (4.1.1) lib/action_dispatch/middleware/remote_ip.rb:76:in
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lib/action_dispatch/middleware/debug_exceptions.rb:17:incall'
actionpack (4.1.1)
lib/action_dispatch/middleware/show_exceptions.rb:30:in call'
railties (4.1.1) lib/rails/rack/logger.rb:38:incall_app' railties
(4.1.1) lib/rails/rack/logger.rb:20:in block in call' activesupport
(4.1.1) lib/active_support/tagged_logging.rb:68:inblock in tagged'
activesupport (4.1.1) lib/active_support/tagged_logging.rb:26:in
tagged' activesupport (4.1.1)
lib/active_support/tagged_logging.rb:68:intagged' railties (4.1.1)
lib/rails/rack/logger.rb:20:in call' actionpack (4.1.1)
lib/action_dispatch/middleware/request_id.rb:21:incall' rack (1.5.2)
lib/rack/methodoverride.rb:21:in call' rack (1.5.2)
lib/rack/runtime.rb:17:incall' activesupport (4.1.1)
lib/active_support/cache/strategy/local_cache_middleware.rb:26:in
call' rack (1.5.2) lib/rack/lock.rb:17:incall' actionpack (4.1.1)
lib/action_dispatch/middleware/static.rb:64:in call' rack (1.5.2)
lib/rack/sendfile.rb:112:incall' railties (4.1.1)
lib/rails/engine.rb:514:in call' railties (4.1.1)
lib/rails/application.rb:144:incall' rack (1.5.2)
lib/rack/lock.rb:17:in call' rack (1.5.2)
lib/rack/content_length.rb:14:incall' rack (1.5.2)
lib/rack/handler/webrick.rb:60:in service'
/home/rick/.rvm/rubies/ruby-2.1.1/lib/ruby/2.1.0/webrick/httpserver.rb:138:in
service'
/home/rick/.rvm/rubies/ruby-2.1.1/lib/ruby/2.1.0/webrick/httpserver.rb:94:in
run'
/home/rick/.rvm/rubies/ruby-2.1.1/lib/ruby/2.1.0/webrick/server.rb:295:in
block in start_thread'