关于rails上的ruby：找不到具有id =＃的用户

Couldn't find User with id=#

点击"编辑"时出现此错误：

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Couldn't find User with id=#<ActiveRecord::Relation::ActiveRecord_Relation_User:0x2eb9b58>

ActiveRecord::RecordNotFound in UsersController#edit

这是UsersController：

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class UsersController < ApplicationController
before_action :set_user, only: [:index, :show, :edit, :create, :update, :destroy]
...
def edit
@user = User.find(params[:id]) #the error points to this line.
end
...
end

完全跟踪如下：

activerecord (4.0.0)
lib/active_record/relation/finder_methods.rb:198:in
raise_record_not_found_exception!' activerecord (4.0.0)
lib/active_record/relation/finder_methods.rb:284:infind_one'
activerecord (4.0.0)
lib/active_record/relation/finder_methods.rb:268:in find_with_ids'
activerecord (4.0.0)
lib/active_record/relation/finder_methods.rb:35:infind'
activerecord-deprecated_finders (1.0.3)
lib/active_record/deprecated_finders/relation.rb:122:in find' C:in
find' app/controllers/users_controller.rb:18:in edit' actionpack
(4.0.0) lib/action_controller/metal/implicit_render.rb:4:in
send_action' actionpack (4.0.0)
lib/abstract_controller/base.rb:189:in process_action' actionpack
(4.0.0) lib/action_controller/metal/rendering.rb:10:in
process_action' actionpack (4.0.0)
lib/abstract_controller/callbacks.rb:18:in block in process_action'
activesupport (4.0.0) lib/active_support/callbacks.rb:413:in
run_759441773__process_action__callbacks' activesupport (4.0.0)
lib/active_support/callbacks.rb:80:in run_callbacks' actionpack
(4.0.0) lib/abstract_controller/callbacks.rb:17:inprocess_action'
actionpack (4.0.0) lib/action_controller/metal/rescue.rb:29:in
process_action' actionpack (4.0.0)
lib/action_controller/metal/instrumentation.rb:31:inblock in
process_action' activesupport (4.0.0)
lib/active_support/notifications.rb:159:in block in instrument'
activesupport (4.0.0)
lib/active_support/notifications/instrumenter.rb:20:ininstrument'
activesupport (4.0.0) lib/active_support/notifications.rb:159:in
instrument' actionpack (4.0.0)
lib/action_controller/metal/instrumentation.rb:30:inprocess_action'
actionpack (4.0.0)
lib/action_controller/metal/params_wrapper.rb:245:in process_action'
activerecord (4.0.0)
lib/active_record/railties/controller_runtime.rb:18:in
process_action' actionpack (4.0.0)
lib/abstract_controller/base.rb:136:in process' actionpack (4.0.0)
lib/abstract_controller/rendering.rb:44:inprocess' actionpack
(4.0.0) lib/action_controller/metal.rb:195:in dispatch' actionpack
(4.0.0) lib/action_controller/metal/rack_delegation.rb:13:in
dispatch' actionpack (4.0.0) lib/action_controller/metal.rb:231:in
block in action' actionpack (4.0.0)
lib/action_dispatch/routing/route_set.rb:80:incall' actionpack
(4.0.0) lib/action_dispatch/routing/route_set.rb:80:in dispatch'
actionpack (4.0.0) lib/action_dispatch/routing/route_set.rb:48:in
call' actionpack (4.0.0) lib/action_dispatch/journey/router.rb:71:in
block in call' actionpack (4.0.0)
lib/action_dispatch/journey/router.rb:59:ineach' actionpack (4.0.0)
lib/action_dispatch/journey/router.rb:59:in call' actionpack (4.0.0)
lib/action_dispatch/routing/route_set.rb:655:incall' rack (1.5.2)
lib/rack/etag.rb:23:in call' rack (1.5.2)
lib/rack/conditionalget.rb:25:incall' rack (1.5.2)
lib/rack/head.rb:11:in call' actionpack (4.0.0)
lib/action_dispatch/middleware/params_parser.rb:27:incall'
actionpack (4.0.0) lib/action_dispatch/middleware/flash.rb:241:in
call' rack (1.5.2) lib/rack/session/abstract/id.rb:225:incontext'
rack (1.5.2) lib/rack/session/abstract/id.rb:220:in call' actionpack
(4.0.0) lib/action_dispatch/middleware/cookies.rb:486:incall'
activerecord (4.0.0) lib/active_record/query_cache.rb:36:in call'
activerecord (4.0.0)
lib/active_record/connection_adapters/abstract/connection_pool.rb:626:in
call' activerecord (4.0.0) lib/active_record/migration.rb:369:in
call' actionpack (4.0.0)
lib/action_dispatch/middleware/callbacks.rb:29:inblock in call'
activesupport (4.0.0) lib/active_support/callbacks.rb:373:in
_run__847569706__call__callbacks' activesupport (4.0.0)
lib/active_support/callbacks.rb:80:inrun_callbacks' actionpack
(4.0.0) lib/action_dispatch/middleware/callbacks.rb:27:in call'
actionpack (4.0.0) lib/action_dispatch/middleware/reloader.rb:64:in
call' actionpack (4.0.0)
lib/action_dispatch/middleware/remote_ip.rb:76:in call' actionpack
(4.0.0) lib/action_dispatch/middleware/debug_exceptions.rb:17:in
call' actionpack (4.0.0)
lib/action_dispatch/middleware/show_exceptions.rb:30:in call'
railties (4.0.0) lib/rails/rack/logger.rb:38:incall_app' railties
(4.0.0) lib/rails/rack/logger.rb:21:in block in call' activesupport
(4.0.0) lib/active_support/tagged_logging.rb:67:inblock in tagged'
activesupport (4.0.0) lib/active_support/tagged_logging.rb:25:in
tagged' activesupport (4.0.0)
lib/active_support/tagged_logging.rb:67:intagged' railties (4.0.0)
lib/rails/rack/logger.rb:21:in call' actionpack (4.0.0)
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 (4.0.0)
lib/active_support/cache/strategy/local_cache.rb:83:in call' rack
(1.5.2) lib/rack/lock.rb:17:incall' actionpack (4.0.0)
lib/action_dispatch/middleware/static.rb:64:in call' railties (4.0.0)
lib/rails/engine.rb:511:incall' railties (4.0.0)
lib/rails/application.rb:97:in call' rack (1.5.2)
lib/rack/lock.rb:17:incall' rack (1.5.2)
lib/rack/content_length.rb:14:in call' rack (1.5.2)
lib/rack/handler/webrick.rb:60:inservice'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/webrick/httpserver.rb:138:in
service'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/webrick/httpserver.rb:94:in
run'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/webrick/server.rb:191:in
`block in start_thread'