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POmongoid has_many relations
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  1. POmongoid has_many relations
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    copied!<pre><code>this is index.html.erb &lt;p&gt; &lt;%= number_to_currency(product.price) %&gt; &lt;%= button_to 'Add to Cart', cart_items_path(:product_id =&gt; product) %&gt; &lt;/p&gt; </code></pre> <h2>cart.rb</h2> <pre><code>class Cart include Mongoid::Document include Mongoid::Timestamps # references_many :cart_items, :dependent =&gt; :destroy has_many :cart_items, :dependent =&gt; :destroy , :autosave =&gt; true # embeds_many :cart_items # accepts_nested_attributes_for :cart_items # attr_accessible :cart_items_attributes end </code></pre> <h2>cart_item.rb</h2> <pre><code>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 =&gt; Integer field :cart_id, :type =&gt; Integer field :quantity, :type =&gt; Integer field :price, :type =&gt; Float end </code></pre> <h2>application_controller.rb</h2> <p>...</p> <p>private</p> <h1>current cart call anywhere in this app</h1> <p>def current_cart</p> <pre><code>cart = if session[:cart_id] Cart.find(session[:cart_id]) else Cart.create! end session[:cart_id] = cart.id </code></pre> <p>end</p> <h2>cart_items.rb</h2> <p>... def create</p> <pre><code>@cart = current_cart product = Product.find(params[:product_id]) @cart_item = @cart.cart_items.build(:product =&gt; product) # @cart_item = CartItem.new(params[:product =&gt; 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 </code></pre> <p>end ....</p> <h2>product.rb</h2> <pre><code>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 =&gt; String field :description, :type =&gt; String # field :image, :type =&gt; String mount_uploader :image, ImageUploader field :price, :type =&gt; Float field :category_id, :type =&gt; Integer field :stock_level, :type =&gt; 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 </code></pre> <hr> <p>and the result is this: <strong>NoMethodError in CartItemsController#create</strong> undefined method <strong>`cart_items'</strong> for BSON::ObjectId('4e156c78421aa918eb000005'):BSON::ObjectId Rails.root: /Users/user/railsworks/rcart</p> <p>Application Trace | Framework Trace | Full Trace app/controllers/cart_items_controller.rb:46:in <code>create' actionpack (3.1.0.rc4) lib/action_controller/metal/implicit_render.rb:4:in</code>send_action' actionpack (3.1.0.rc4) lib/abstract_controller/base.rb:167:in <code>process_action' actionpack (3.1.0.rc4) lib/action_controller/metal/rendering.rb:10:in</code>process_action' actionpack (3.1.0.rc4) lib/abstract_controller/callbacks.rb:18:in <code>block in process_action' activesupport (3.1.0.rc4) lib/active_support/callbacks.rb:416:in</code><em>run</em>_1145394839032970144__process_action_<em>2623355606222143076</em>_callbacks' activesupport (3.1.0.rc4) lib/active_support/callbacks.rb:386:in <code>_run_process_action_callbacks' activesupport (3.1.0.rc4) lib/active_support/callbacks.rb:81:in</code>run_callbacks' actionpack (3.1.0.rc4) lib/abstract_controller/callbacks.rb:17:in <code>process_action' actionpack (3.1.0.rc4) lib/action_controller/metal/instrumentation.rb:30:in</code>block in process_action' activesupport (3.1.0.rc4) lib/active_support/notifications.rb:55:in <code>block in instrument' activesupport (3.1.0.rc4) lib/active_support/notifications/instrumenter.rb:21:in</code>instrument' activesupport (3.1.0.rc4) lib/active_support/notifications.rb:55:in <code>instrument' actionpack (3.1.0.rc4) lib/action_controller/metal/instrumentation.rb:29:in</code>process_action' actionpack (3.1.0.rc4) lib/action_controller/metal/params_wrapper.rb:202:in <code>process_action' actionpack (3.1.0.rc4) lib/action_controller/metal/rescue.rb:17:in</code>process_action' activerecord (3.1.0.rc4) lib/active_record/railties/controller_runtime.rb:18:in <code>process_action' actionpack (3.1.0.rc4) lib/abstract_controller/base.rb:121:in</code>process' actionpack (3.1.0.rc4) lib/abstract_controller/rendering.rb:45:in <code>process' actionpack (3.1.0.rc4) lib/action_controller/metal.rb:193:in</code>dispatch' actionpack (3.1.0.rc4) lib/action_controller/metal/rack_delegation.rb:14:in <code>dispatch' actionpack (3.1.0.rc4) lib/action_controller/metal.rb:236:in</code>block in action' actionpack (3.1.0.rc4) lib/action_dispatch/routing/route_set.rb:65:in <code>call' actionpack (3.1.0.rc4) lib/action_dispatch/routing/route_set.rb:65:in</code>dispatch' actionpack (3.1.0.rc4) lib/action_dispatch/routing/route_set.rb:29:in <code>call' rack-mount (0.8.1) lib/rack/mount/route_set.rb:152:in</code>block in call' rack-mount (0.8.1) lib/rack/mount/code_generation.rb:93:in <code>block in recognize' rack-mount (0.8.1) lib/rack/mount/code_generation.rb:75:in</code>optimized_each' rack-mount (0.8.1) lib/rack/mount/code_generation.rb:92:in <code>recognize' rack-mount (0.8.1) lib/rack/mount/route_set.rb:141:in</code>call' actionpack (3.1.0.rc4) lib/action_dispatch/routing/route_set.rb:531:in <code>call' warden (1.0.4) lib/warden/manager.rb:35:in</code>block in call' warden (1.0.4) lib/warden/manager.rb:34:in <code>catch' warden (1.0.4) lib/warden/manager.rb:34:in</code>call' actionpack (3.1.0.rc4) lib/action_dispatch/middleware/best_standards_support.rb:17:in <code>call' rack (1.3.0) lib/rack/etag.rb:23:in</code>call' rack (1.3.0) lib/rack/conditionalget.rb:35:in <code>call' actionpack (3.1.0.rc4) lib/action_dispatch/middleware/head.rb:14:in</code>call' actionpack (3.1.0.rc4) lib/action_dispatch/middleware/params_parser.rb:21:in <code>call' actionpack (3.1.0.rc4) lib/action_dispatch/middleware/flash.rb:243:in</code>call' rack (1.3.0) lib/rack/session/abstract/id.rb:195:in <code>context' rack (1.3.0) lib/rack/session/abstract/id.rb:190:in</code>call' actionpack (3.1.0.rc4) lib/action_dispatch/middleware/cookies.rb:321:in <code>call' activerecord (3.1.0.rc4) lib/active_record/query_cache.rb:54:in</code>call' activerecord (3.1.0.rc4) lib/active_record/connection_adapters/abstract/connection_pool.rb:448:in <code>call' actionpack (3.1.0.rc4) lib/action_dispatch/middleware/callbacks.rb:29:in</code>block in call' activesupport (3.1.0.rc4) lib/active_support/callbacks.rb:392:in <code>_run_call_callbacks' activesupport (3.1.0.rc4) lib/active_support/callbacks.rb:81:in</code>run_callbacks' actionpack (3.1.0.rc4) lib/action_dispatch/middleware/callbacks.rb:28:in <code>call' actionpack (3.1.0.rc4) lib/action_dispatch/middleware/reloader.rb:68:in</code>call' rack (1.3.0) lib/rack/sendfile.rb:102:in <code>call' actionpack (3.1.0.rc4) lib/action_dispatch/middleware/remote_ip.rb:48:in</code>call' actionpack (3.1.0.rc4) lib/action_dispatch/middleware/show_exceptions.rb:47:in <code>call' railties (3.1.0.rc4) lib/rails/rack/logger.rb:13:in</code>call' rack (1.3.0) lib/rack/methodoverride.rb:24:in <code>call' rack (1.3.0) lib/rack/runtime.rb:17:in</code>call' activesupport (3.1.0.rc4) lib/active_support/cache/strategy/local_cache.rb:72:in <code>call' rack (1.3.0) lib/rack/lock.rb:34:in</code>call' actionpack (3.1.0.rc4) lib/action_dispatch/middleware/static.rb:53:in <code>call' railties (3.1.0.rc4) lib/rails/engine.rb:438:in</code>call' railties (3.1.0.rc4) lib/rails/rack/content_length.rb:16:in <code>call' railties (3.1.0.rc4) lib/rails/rack/log_tailer.rb:14:in</code>call' rack (1.3.0) lib/rack/handler/webrick.rb:59:in <code>service' /Users/user/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/webrick/httpserver.rb:111:in</code>service' /Users/user/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/webrick/httpserver.rb:70:in <code>run' /Users/user/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/webrick/server.rb:183:in</code>block in start_thread' Request</p> <p>Parameters:</p> <p>{"authenticity_token"=>"vwNaDytLihv5ev3M2tP5uZBjwR1/t6ld0iFF1gGwWsw=", "product_id"=>"4e126c01421aa93347000002"} Show session dump</p> <p>_csrf_token: "vwNaDytLihv5ev3M2tP5uZBjwR1/t6ld0iFF1gGwWsw=" cart_id: BSON::ObjectId('4e156c78421aa918eb000005') session_id: "532c1ca0f48a6fca905a97afba912e05"</p> <p>i did not get the problem point. why this happening undefined method `cart_items' ??? thanks.</p>
 

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