Задержка задания - неопределенный метод `имя 'для nil: NilClass

Question

Я борюсь с этой ошибкой. У меня есть действие контроллера так:

def import 
    InventoryItem.import_list(params[:file], current_vendor.id) 
    redirect_to vendors_dashboard_path, notice: "Inventory Imported" 
end 

Мой метод класса:

class << self 
    def import_list(file, vendor_id) 
     vendor = Vendor.find(vendor_id) 
     SmarterCSV.process(file.path, 
     {:key_mapping => { vendor.import_preference.brand_symbol => :brand, 
     vendor.import_preference.product_symbol => :product, 
     vendor.import_preference.price_symbol => :price, 
     vendor.import_preference.upc_symbol => :upc}}) do |row| 

     params = row.first.merge(:store_id => vendor.stores.first.id) 
      inventory_item = InventoryItem.create(params) 
     end 
    end 
    handle_asynchronously :import_list 
end 

Когда я пытаюсь выполнить, я получаю неопределенную ошибку метода. Этот метод работает без вызова handle_asynchronously и когда я делаю это обычным методом класса self.import. Что я здесь делаю неправильно?

* UPDATE **

журнала сервера ошибки:

Started POST "/inventory_items/import" for 127.0.0.1 at 2014-10-06 09:30:53 -0700 
Processing by InventoryItemsController#import as HTML 
    Parameters: {"utf8"=>"✓", "authenticity_token"=>"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx", "file"=>#<ActionDispatch::Http::UploadedFile:0x000001081d3ab8 @original_filename="Inventory1 - Sheet1.csv", @content_type="text/csv", @headers="Content-Disposition: form-data; name=\"file\"; filename=\"Inventory1 - Sheet1.csv\"\r\nContent-Type: text/csv\r\n", @tempfile=#<Tempfile:/var/folders/6Q/6Qj+aFh4A4orYbGW-nE+++TI/-Tmp-/RackMultipart201406-65416-1dcpxp9>>, "commit"=>"Import"} 
    Vendor Load (0.9ms) SELECT "vendors".* FROM "vendors" WHERE "vendors"."id" = 25 LIMIT 1 
Completed 500 Internal Server Error in 99ms 

NoMethodError (undefined method `name' for nil:NilClass): 
    app/controllers/inventory_items_controller.rb:6:in `import' 

Соответствующие трассировки стека:

/Users/myname/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/psych/visitors/yaml_tree.rb:50:in `block in initialize' 
/Users/myname/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/psych/visitors/yaml_tree.rb:52:in `yield' 
/Users/myname/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/psych/visitors/yaml_tree.rb:52:in `block in initialize' 
/Users/myname/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/psych/visitors/yaml_tree.rb:52:in `yield' 
/Users/myname/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/psych/visitors/yaml_tree.rb:52:in `block in initialize' 
/Users/myname/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/psych/visitors/yaml_tree.rb:52:in `yield' 
/Users/myname/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/psych/visitors/yaml_tree.rb:52:in `block in initialize' 
/Users/myname/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/psych/visitors/yaml_tree.rb:52:in `yield' 
/Users/myname/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/psych/visitors/yaml_tree.rb:52:in `block in initialize' 
/Users/myname/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/psych/visitors/yaml_tree.rb:128:in `yield' 
/Users/myname/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/psych/visitors/yaml_tree.rb:128:in `accept' 
/Users/myname/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/psych/visitors/yaml_tree.rb:480:in `block in dump_ivars' 
/Users/myname/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/psych/visitors/yaml_tree.rb:478:in `each' 
/Users/myname/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/psych/visitors/yaml_tree.rb:478:in `dump_ivars' 
/Users/myname/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/psych/visitors/yaml_tree.rb:150:in `visit_Object' 
/Users/myname/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/psych/visitors/yaml_tree.rb:128:in `accept' 
/Users/myname/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/psych/visitors/yaml_tree.rb:344:in `block in visit_Array' 
/Users/myname/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/psych/visitors/yaml_tree.rb:344:in `each' 
/Users/myname/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/psych/visitors/yaml_tree.rb:344:in `visit_Array' 
/Users/myname/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/psych/visitors/yaml_tree.rb:128:in `accept' 
/Users/myname/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/psych/visitors/yaml_tree.rb:467:in `block in emit_coder' 
/Users/myname/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/psych/visitors/yaml_tree.rb:465:in `each' 
/Users/myname/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/psych/visitors/yaml_tree.rb:465:in `emit_coder' 
/Users/myname/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/psych/visitors/yaml_tree.rb:450:in `dump_coder' 
/Users/myname/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/psych/visitors/yaml_tree.rb:126:in `accept' 
/Users/myname/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/psych/visitors/yaml_tree.rb:92:in `push' 
/Users/myname/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/psych.rb:244:in `dump' 
delayed_job (4.0.4) lib/delayed/backend/base.rb:81:in `payload_object=' 
activerecord (3.2.13) lib/active_record/attribute_assignment.rb:85:in `block in assign_attributes' 
activerecord (3.2.13) lib/active_record/attribute_assignment.rb:78:in `each' 
activerecord (3.2.13) lib/active_record/attribute_assignment.rb:78:in `assign_attributes' 
activerecord (3.2.13) lib/active_record/base.rb:498:in `initialize' 
delayed_job (4.0.4) lib/delayed/backend/base.rb:32:in `new' 
delayed_job (4.0.4) lib/delayed/backend/base.rb:32:in `enqueue' 
delayed_job (4.0.4) lib/delayed/message_sending.rb:12:in `method_missing' 
delayed_job (4.0.4) lib/delayed/message_sending.rb:46:in `block in handle_asynchronously' 
actionpack (3.2.13) lib/action_controller/metal/implicit_render.rb:4:in `send_action' 

Answer 1

params[:file] не будет ранжированы правильно при сохранении в базу данных для delayed_job. Вместо прохождения params[:file] объекта в качестве первого аргумента, пройти путь к файлу вместо:

def import 
    InventoryItem.import_list(params[:file].path, current_vendor.id) 
    redirect_to vendors_dashboard_path, notice: "Inventory Imported" 
end 

Затем просто использовать путь непосредственно в методе работника:

class << self 
    def import_list(path, vendor_id) 
    vendor = Vendor.find(vendor_id) 
    SmarterCSV.process(path, {:key_mapping => { vendor.import_preference.brand_symbol => :brand, vendor.import_preference.product_symbol => :product, vendor.import_preference.price_symbol => :price, vendor.import_preference.upc_symbol => :upc}}) do |row| 
     params = row.first.merge(:store_id => vendor.stores.first.id) 
     inventory_item = InventoryItem.create(params) 
    end 
    end 
    handle_asynchronously :import_list 
end