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我正在与活跃的管理员一起工作我有收集选择或下拉框来填充包裹和工作人员我只是想知道我为什么

undefined method `[]' for nil:NilClass`

我不知道发生了什么，但它几天前运行并测试了一次，但现在它引发了这个错误，有没有可能解决这个问题的方法？

def create
   @package = Package.find(params[:package_crew][:package_id])
   crew = Crew.find(params[:package_crew][:crew_id] )
   @package_crew = @package.add_crew(crew.id)
   if @package_crew.save
      redirect_to {admin_package_crew_url}
   end
 end

提前感谢我们所有人的更多力量

我试过这个

def create
  #pid = params[:package_crew][:crew_id] if params[:package_crew]
  pid,cid = 2 #tried nil,0..10 
  if params[:package_crew]
     pid = params[:package_crew][:package_id] 
     cid = params[:package_crew][:crew_id] 
  end
  @package = Package.find_by_id(pid) 
  crew = Crew.find_by_id(cid)
  #@package = Package.find(params[:package_crew][:package_id])
  #crew = Crew.find(params[:package_crew][:crew_id] )
  @package_crew = @package.add_crew(crew.id)
  if @package_crew.save
     redirect_to {admin_package_crew_url}
  end

结尾

add_crew 方法

def add_crew(crew_id)
    current_package = package_crews.find_by_crew_id(crew_id)
    if current_package
      current_package.quantity = current_package.quantity.to_i + 1
    else
      current_package = package_crews.build(:crew_id => crew_id)
      current_package.price = current_package.crew.price
    end
      current_package
  end

移动参数

{"utf8"=>"✓",
 "authenticity_token"=>"n4WZpQpES6mnSO12oGKV/MeoxAVvV9OmJQKfhcpnvQM=",
 "crew_for_package"=>{"package_id"=>"1",
 "crew_id"=>"1",
 "quantity"=>"1"},
 "commit"=>"Create Package crew"}

堆栈错误

app/admin/package_crews.rb:35:in `create'
actionpack (3.2.1) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
actionpack (3.2.1) lib/abstract_controller/base.rb:167:in `process_action'
actionpack (3.2.1) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (3.2.1) lib/abstract_controller/callbacks.rb:18:in `block in process_action'
activesupport (3.2.1) lib/active_support/callbacks.rb:447:in `_run__304549499__process_action__775442107__callbacks'
activesupport (3.2.1) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.1) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks'
activesupport (3.2.1) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.1) lib/abstract_controller/callbacks.rb:17:in `process_action'
actionpack (3.2.1) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (3.2.1) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
activesupport (3.2.1) lib/active_support/notifications.rb:123:in `block in instrument'
activesupport (3.2.1) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (3.2.1) lib/active_support/notifications.rb:123:in `instrument'
actionpack (3.2.1) lib/action_controller/metal/instrumentation.rb:29:in `process_action'
actionpack (3.2.1) lib/action_controller/metal/params_wrapper.rb:205:in `process_action'
activerecord (3.2.1) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (3.2.1) lib/abstract_controller/base.rb:121:in `process'
actionpack (3.2.1) lib/abstract_controller/rendering.rb:45:in `process'
actionpack (3.2.1) lib/action_controller/metal.rb:203:in `dispatch'
actionpack (3.2.1) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
actionpack (3.2.1) lib/action_controller/metal.rb:246:in `block in action'
actionpack (3.2.1) lib/action_dispatch/routing/route_set.rb:66:in `call'
actionpack (3.2.1) lib/action_dispatch/routing/route_set.rb:66:in `dispatch'
actionpack (3.2.1) lib/action_dispatch/routing/route_set.rb:30:in `call'
journey (1.0.3) lib/journey/router.rb:68:in `block in call'
journey (1.0.3) lib/journey/router.rb:56:in `each'
journey (1.0.3) lib/journey/router.rb:56:in `call'
actionpack (3.2.1) lib/action_dispatch/routing/route_set.rb:589:in `call'
sass (3.1.15) lib/sass/plugin/rack.rb:54:in `call'
warden (1.1.1) lib/warden/manager.rb:35:in `block in call'
warden (1.1.1) lib/warden/manager.rb:34:in `catch'
warden (1.1.1) lib/warden/manager.rb:34:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
rack (1.4.1) lib/rack/etag.rb:23:in `call'
rack (1.4.1) lib/rack/conditionalget.rb:35:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/head.rb:14:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/params_parser.rb:21:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/flash.rb:242:in `call'
rack (1.4.1) lib/rack/session/abstract/id.rb:205:in `context'
rack (1.4.1) lib/rack/session/abstract/id.rb:200:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/cookies.rb:338:in `call'
activerecord (3.2.1) lib/active_record/query_cache.rb:64:in `call'
activerecord (3.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:443:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
activesupport (3.2.1) lib/active_support/callbacks.rb:405:in `_run__1039351831__call__833288071__callbacks'
activesupport (3.2.1) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.1) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
activesupport (3.2.1) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.1) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/reloader.rb:65:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
railties (3.2.1) lib/rails/rack/logger.rb:26:in `call_app'
railties (3.2.1) lib/rails/rack/logger.rb:16:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/request_id.rb:22:in `call'
rack (1.4.1) lib/rack/methodoverride.rb:21:in `call'
rack (1.4.1) lib/rack/runtime.rb:17:in `call'
activesupport (3.2.1) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.4.1) lib/rack/lock.rb:15:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/static.rb:53:in `call'
railties (3.2.1) lib/rails/engine.rb:479:in `call'
railties (3.2.1) lib/rails/application.rb:220:in `call'
railties (3.2.1) lib/rails/railtie/configurable.rb:30:in `method_missing'
/home/led/.passenger/standalone/3.0.11-x86-ruby1.9.3-linux-gcc4.6.3-1002/support/lib/phusion_passenger/rack/request_handler.rb:96:in `process_request'
/home/led/.passenger/standalone/3.0.11-x86-ruby1.9.3-linux-gcc4.6.3-1002/support/lib/phusion_passenger/abstract_request_handler.rb:513:in `accept_and_process_next_request'
/home/led/.passenger/standalone/3.0.11-x86-ruby1.9.3-linux-gcc4.6.3-1002/support/lib/phusion_passenger/abstract_request_handler.rb:274:in `main_loop'
/home/led/.passenger/standalone/3.0.11-x86-ruby1.9.3-linux-gcc4.6.3-1002/support/lib/phusion_passenger/rack/application_spawner.rb:206:in `start_request_handler'
/home/led/.passenger/standalone/3.0.11-x86-ruby1.9.3-linux-gcc4.6.3-1002/support/lib/phusion_passenger/rack/application_spawner.rb:171:in `block in handle_spawn_application'
/home/led/.passenger/standalone/3.0.11-x86-ruby1.9.3-linux-gcc4.6.3-1002/support/lib/phusion_passenger/utils.rb:479:in `safe_fork'
/home/led/.passenger/standalone/3.0.11-x86-ruby1.9.3-linux-gcc4.6.3-1002/support/lib/phusion_passenger/rack/application_spawner.rb:166:in `handle_spawn_application'
/home/led/.passenger/standalone/3.0.11-x86-ruby1.9.3-linux-gcc4.6.3-1002/support/lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
/home/led/.passenger/standalone/3.0.11-x86-ruby1.9.3-linux-gcc4.6.3-1002/support/lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
/home/led/.passenger/standalone/3.0.11-x86-ruby1.9.3-linux-gcc4.6.3-1002/support/lib/phusion_passenger/abstract_server.rb:180:in `start'
/home/led/.passenger/standalone/3.0.11-x86-ruby1.9.3-linux-gcc4.6.3-1002/support/lib/phusion_passenger/rack/application_spawner.rb:129:in `start'
/home/led/.passenger/standalone/3.0.11-x86-ruby1.9.3-linux-gcc4.6.3-1002/support/lib/phusion_passenger/spawn_manager.rb:253:in `block (2 levels) in spawn_rack_application'
/home/led/.passenger/standalone/3.0.11-x86-ruby1.9.3-linux-gcc4.6.3-1002/support/lib/phusion_passenger/abstract_server_collection.rb:132:in `lookup_or_add'
/home/led/.passenger/standalone/3.0.11-x86-ruby1.9.3-linux-gcc4.6.3-1002/support/lib/phusion_passenger/spawn_manager.rb:246:in `block in spawn_rack_application'
/home/led/.passenger/standalone/3.0.11-x86-ruby1.9.3-linux-gcc4.6.3-1002/support/lib/phusion_passenger/abstract_server_collection.rb:82:in `block in synchronize'
<internal:prelude>:10:in `synchronize'
/home/led/.passenger/standalone/3.0.11-x86-ruby1.9.3-linux-gcc4.6.3-1002/support/lib/phusion_passenger/abstract_server_collection.rb:79:in `synchronize'
/home/led/.passenger/standalone/3.0.11-x86-ruby1.9.3-linux-gcc4.6.3-1002/support/lib/phusion_passenger/spawn_manager.rb:244:in `spawn_rack_application'
/home/led/.passenger/standalone/3.0.11-x86-ruby1.9.3-linux-gcc4.6.3-1002/support/lib/phusion_passenger/spawn_manager.rb:137:in `spawn_application'
/home/led/.passenger/standalone/3.0.11-x86-ruby1.9.3-linux-gcc4.6.3-1002/support/lib/phusion_passenger/spawn_manager.rb:275:in `handle_spawn_application'
/home/led/.passenger/standalone/3.0.11-x86-ruby1.9.3-linux-gcc4.6.3-1002/support/lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
/home/led/.passenger/standalone/3.0.11-x86-ruby1.9.3-linux-gcc4.6.3-1002/support/lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
/home/led/.passenger/standalone/3.0.11-x86-ruby1.9.3-linux-gcc4.6.3-1002/support/helper-scripts/passenger-spawn-server:99:in `<main>'
4

1 回答 1

0

据我所知，您的 params[:package_crew] 返回 nil

检查你的参数[:package_crew]

尝试关注

pid,cid = 0
if params[:package_crew]
  pid = params[:package_crew][:package_id] 
  cid = params[:package_crew][:crew_id] 
end
@package = Package.find(pid)
@crew = Crew.find(cid)

我建议宁愿使用它。

Package.find_by_id(pid) # this wont raise exception, when record is not found 
Crew.find_by_id(cid)
于 2012-04-19T15:48:10.340 回答