mongoid has_many отношения - PullRequest
Новая
       14

mongoid has_many отношения

0 голосов
/ 07 июля 2011 
this is index.html.erb
            <p>
             <%= number_to_currency(product.price) %>  
             <%= button_to 'Add to Cart', cart_items_path(:product_id => product) %>
            </p>

cart.rb 

class Cart
  include Mongoid::Document
  include Mongoid::Timestamps 
  # references_many :cart_items, :dependent => :destroy
   has_many :cart_items, :dependent => :destroy , :autosave => true 
  # embeds_many :cart_items

  # accepts_nested_attributes_for :cart_items
  # attr_accessible :cart_items_attributes
end

cart_item.rb 

class CartItem
  include Mongoid::Document
  include Mongoid::Timestamps 
  # referenced_in :cart
  # embedded_in :cart
  belongs_to :cart
  belongs_to :product 
  # embedded_in :product  
  field :product_id, :type => Integer
  field :cart_id, :type => Integer
  field :quantity, :type => Integer
  field :price, :type => Float
end

application_controller.rb

...

private

текущий вызов корзины в любом месте этого приложения

def current_cart 

cart = if session[:cart_id]
  Cart.find(session[:cart_id])
else
  Cart.create!
end
   session[:cart_id] = cart.id

end

cart_items.rb

... def create

@cart = current_cart 
product = Product.find(params[:product_id]) 
@cart_item = @cart.cart_items.build(:product => product)
# @cart_item = CartItem.new(params[:product => product])
 # @cart_item = CartItem.new(params[:cart_item])

respond_to do |format|
  if @cart_item.save
    format.html { redirect_to(@cart_item,  notice: 'Cart item was successfully created.') }
    format.json { render json: @cart_item, status: :created, location: @cart_item }
  else
    format.html { render action: "new" }
    format.json { render json: @cart_item.errors, status: :unprocessable_entity }
  end
end

end ....

product.rb 

require 'carrierwave/orm/mongoid'
class Product
  include Mongoid::Document
  include Mongoid::Timestamps 
  # include Mongoid::Observing
  # include Mongoid::Tree
  has_many :line_items

  # before_destroy :ensure_not_referenced_by_any_line_item

  field :title, :type => String
  field :description, :type => String
  # field :image, :type => String
  mount_uploader :image, ImageUploader
  field :price, :type => Float
  field :category_id, :type => Integer
  field :stock_level, :type => Integer


  set_callback(:destroy, :before) do |document|
    document.ensure_not_referenced_by_any_line_item
  end

  protected
  def ensure_not_referenced_by_any_line_item        
   if cart_items.empty? 
     return true 
   else
     errors.add(:base, 'Line Items present')
     return false 
    end
   end
end

и результат такой: NoMethodError в CartItemsController # create неопределенный метод `cart_items ' для BSON :: ObjectId (' 4e156c78421aa918eb000005 '): BSON :: ObjectId Rails.root: / Пользователи / пользователь / railsworks / rcart

Отслеживание приложения |Framework Trace |Приложение Full Trace / controllers / cart_items_controller.rb: 46: в create' actionpack (3.1.0.rc4) lib/action_controller/metal/implicit_render.rb:4:in send_action 'actionpack (3.1.0.rc4) lib / abstract_controller / base.rb: 167: в process_action' actionpack (3.1.0.rc4) lib/action_controller/metal/rendering.rb:10:in process_action' actionpack (3.1.0.rc4)lib / abstract_controller / callbacks.rb: 18: in block in process_action' activesupport (3.1.0.rc4) lib/active_support/callbacks.rb:416:in run _1145394839032970144__process_action_ 2623355606222143076 activesupport _callbacks (3.1.0.rc4) lib / active_support / callback: calls.bb:_run_process_action_callbacks' activesupport (3.1.0.rc4) lib/active_support/callbacks.rb:81:in run_callbacks 'actionpack (3.1.0.rc4) lib / abstract_controller / callbacks.rb: 17: в process_action' actionpack (3.1.0.rc4) lib/action_controller/metal/instrumentation.rb:30:in блок в process_action' activesupport (3.1.0.rc4) lib / active_support / notifications.rb: 55: вblock in instrument' activesupport (3.1.0.rc4) lib/active_support/notifications/instrumenter.rb:21:in instrument 'activesupport (3.1.0.rc4) lib / active_support / notifications.rb: 55: в instrument' actionpack (3.1.0.rc4) lib/action_controller/metal/instrumentation.rb:29:in process_action' actionpack (3.1.0.rc4) lib / action_controller / metal / params_wrapper.rb: 202: вprocess_action' actionpack (3.1.0.rc4) lib/action_controller/metal/rescue.rb:17:in process_action 'activerecord (3.1.0.rc4) lib / active_record / railties / controller_runtime.rb: 18: в process_action' actionpack (3.1.0.rc4) lib/abstract_controller/base.rb:121:in процесс' actionpack (3.1.0.rc4) lib / abstract_controller / render.rb: 45: вprocess' actionpack (3.1.0.rc4) lib/action_controller/metal.rb:193:in dispatch 'actionpack (3.1.0.rc4) lib / action_controller / metal / rack_delegation.rb: 14: в dispatch' actionpack (3.1.0.rc4) lib/action_controller/metal.rb:236:in блок в действии 'пакет действий (3.1.0.rc4) lib / action_dispatch / routing / route_set.rb: 65: в call' actionpack (3.1.0.rc4) lib/action_dispatch/routing/route_set.rb:65:in отправка' пакет действий (3.1.0.rc4) lib / action_dispatch / routing / route_set.rb: 29: в блоке call' rack-mount (0.8.1) lib/rack/mount/route_set.rb:152:in при вызове 'mount-mount (0.8.1) lib / rack / mount / code_generation.rb: 93: в block in recognize' rack-mount (0.8.1) lib/rack/mount/code_generation.rb:75:in optimized_each' rack-mount (0.8.1) lib / rack / mount / code_generation.rb: 92: в recognize' rack-mount (0.8.1) lib/rack/mount/route_set.rb:141:in call 'actionpack (3.1.0.rc4) lib / action_dispatch / routing / route_set.rb: 531: в call' warden (1.0.4) lib/warden/manager.rb:35:in блоке ввызов 'warden (1.0.4) lib / warden / manager.rb: 34: in catch' warden (1.0.4) lib/warden/manager.rb:34:in call' actionpack (3.1.0.rc4) lib / action_dispatch / middleware / best_standards_support.rb: 17: в call' rack (1.3.0) lib/rack/etag.rb:23:in call 'rack (1.3.0) lib / rack / conditionalget.rb: 35: in call' actionpack (3.1.0.rc4) lib/action_dispatch/middleware/head.rb:14:in call 'actionpack (3.1.0.rc4) lib / action_dispatch / middleware / params_parser.rb: 21: в call' actionpack (3.1.0.rc4) lib/action_dispatch/middleware/flash.rb:243:in call' rack (1.3.0) lib / rack / session / abstract / id.rb: 195: в context' rack (1.3.0) lib/rack/session/abstract/id.rb:190:in call 'actionpack (3.1.0.rc4) lib / action_dispatch / middleware / cookies.rb: 321: в call' activerecord (3.1.0.rc4) lib/active_record/query_cache.rb:54:in call'activerecord (3.1.0.rc4) lib / active_record / connection_adapters / abstract / connection_pool.rb: 448: в блоке call' actionpack (3.1.0.rc4) lib/action_dispatch/middleware/callbacks.rb:29:in в вызове 'activesupport (3.1.0.rc4) lib / active_support / callbacks.rb: 392: в _run_call_callbacks' activesupport (3.1.0.rc4) lib/active_support/callbacks.rb:81:in run_callbacks' actionpack (3.1.0.rc4) lib /action_dispatch / middleware / callbacks.rb: 28: в call' actionpack (3.1.0.rc4) lib/action_dispatch/middleware/reloader.rb:68:in call 'rack (1.3.0) lib / rack / sendfile.rb: 102: в call' actionpack (3.1.0.rc4) lib/action_dispatch/middleware/remote_ip.rb:48:in call' actionpack (3.1.0.rc4) lib / action_dispatch /middleware / show_exceptions.rb: 47: в call' railties (3.1.0.rc4) lib/rails/rack/logger.rb:13:in call 'rack (1.3.0) lib / rack / metadoverride.rb: 24: в call' rack (1.3.0) lib/rack/runtime.rb:17:in call' activesupport (3.1.0.rc4) lib / active_support / cache /стратегия / local_cache.rb: 72: в call' rack (1.3.0) lib/rack/lock.rb:34:in вызов 'actionpack (3.1.0.rc4) lib / action_dispatch / middleware / static.rb: 53: в call' railties (3.1.0.rc4) lib/rails/engine.rb:438:in вызов' railties (3.1.0.rc4) lib /rails / rack / content_length.rb: 16: в call' railties (3.1.0.rc4) lib/rails/rack/log_tailer.rb:14:in call 'rack (1.3.0) lib / rack / handler / webrick.rb: 59: в service' /Users/user/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/webrick/httpserver.rb:111:in service' /Users/user/.rvm/rubies/ruby-1.9.2-p180 / lib / ruby ​​/ 1.9.1 / webrick / httpserver.rb: 70: в run' /Users/user/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/webrick/server.rb:183:in блоке в start_thread 'Request

Параметры:

{"authenticity_token"=>" vwNaDytLihv5ev3M2tP5uZBjwR1 / t6ld0iFF1gGwWsw = "," product_id "=>" 4e126c01421aa93347000002 "}Показать дамп сеанса

_csrf_token: "vwNaDytLihv5ev3M2tP5uZBjwR1 / t6ld0iFF1gGwWsw =" cart_id: BSON :: ObjectId ('4e156c78421aa918eb000005') сессия_id_0505 *почему это происходит неопределенным методом `cart_items '???спасибо.

1 Ответ

0 голосов
/ 02 декабря 2011

Мне нужно увидеть код, который выдает ошибку, чтобы дать вам окончательный ответ о том, почему выдается ошибка (т. Е. Метод create), но почему бы вам не попробовать это для создания корзиныcode: 

def current_cart
  cart = Cart.find_or_create_by(:id => session[:cart_id])
  session[:cart_id] ||= cart.id
  return cart
end

Похоже, что ваша текущая реализация на самом деле не возвращает элемент корзины при его поиске / создании, а вместо этого возвращает переменную session[:cart_id].

Альтернатива инесколько более красивым решением может быть разделение помощника на два метода: 

def current_cart_id
  session[:cart_id] ||= Cart.find_or_create_by(:id => session[:cart_id]).id
end

def current_cart
  @current_cart ||= Cart.find(current_cart_id)
end

Тогда вы можете легко получить доступ к объекту current_cart, и он id в любое время.

...