[英]Cart Array trouble, cart.total_price
我正在為RoR中的一個網站編程一個購物車系統，但是我的購物車有一個奇怪的問題。
我已經用相同的購物車型號制作了另一個應用程序，但是沒有這個問題。
因此，情況如下：
我的應用程序告訴我“ 方法 ”我試圖用它來計算“cart.total _ 價格 ”是“ 未定義 ”。
這是記錄：
顯示/var/rails/caveSACMS/app/views/catalogues/index.html.erb ，其中＃196行出現：
undefined method `prod_pxuttc' for #<Array:0x00000005ce09f0>
提取的源（圍繞行＃196）：
193: </tr>
194: <tr style="background-color:#2c2c2c;">
195: <th style="text-align:center;padding:2px;color:#a2a2a2;">
196: Total: <%=@cart.total_price%>
197: </th>
198: </tr>
199: <tr style="background-color:#2c2c2c;">
Rails.root：/ var / rails / myApp
app/models/cart.rb:15:in `block in total_price'
activesupport (3.2.1) lib/active_support/core_ext/enumerable.rb:60:in `map'
activesupport (3.2.1) lib/active_support/core_ext/enumerable.rb:60:in `sum'
app/models/cart.rb:15:in `total_price'
app/views/catalogues/index.html.erb:196:in `_app_views_catalogues_index_html_erb___2685208389527055012_43230480'
actionpack (3.2.1) lib/action_view/template.rb:143:in `block in render'
activesupport (3.2.1) lib/active_support/notifications.rb:125:in `instrument'
actionpack (3.2.1) lib/action_view/template.rb:141:in `render'
actionpack (3.2.1) lib/action_view/renderer/template_renderer.rb:41:in `block (2 levels) in render_template'
actionpack (3.2.1) lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument'
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_view/renderer/abstract_renderer.rb:38:in `instrument'
actionpack (3.2.1) lib/action_view/renderer/template_renderer.rb:40:in `block in render_template'
actionpack (3.2.1) lib/action_view/renderer/template_renderer.rb:48:in `render_with_layout'
actionpack (3.2.1) lib/action_view/renderer/template_renderer.rb:39:in `render_template'
actionpack (3.2.1) lib/action_view/renderer/template_renderer.rb:12:in `render'
actionpack (3.2.1) lib/action_view/renderer/renderer.rb:36:in `render_template'
actionpack (3.2.1) lib/action_view/renderer/renderer.rb:17:in `render'
actionpack (3.2.1) lib/abstract_controller/rendering.rb:109:in `_render_template'
actionpack (3.2.1) lib/action_controller/metal/streaming.rb:225:in `_render_template'
actionpack (3.2.1) lib/abstract_controller/rendering.rb:103:in `render_to_body'
actionpack (3.2.1) lib/action_controller/metal/renderers.rb:28:in `render_to_body'
actionpack (3.2.1) lib/action_controller/metal/compatibility.rb:50:in `render_to_body'
actionpack (3.2.1) lib/abstract_controller/rendering.rb:88:in `render'
actionpack (3.2.1) lib/action_controller/metal/rendering.rb:16:in `render'
actionpack (3.2.1) lib/action_controller/metal/instrumentation.rb:40:in `block (2 levels) in render'
activesupport (3.2.1) lib/active_support/core_ext/benchmark.rb:5:in `block in ms'
/usr/share/ruby-rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/benchmark.rb:310:in `realtime'
activesupport (3.2.1) lib/active_support/core_ext/benchmark.rb:5:in `ms'
actionpack (3.2.1) lib/action_controller/metal/instrumentation.rb:40:in `block in render'
actionpack (3.2.1) lib/action_controller/metal/instrumentation.rb:83:in `cleanup_view_runtime'
activerecord (3.2.1) lib/active_record/railties/controller_runtime.rb:24:in `cleanup_view_runtime'
actionpack (3.2.1) lib/action_controller/metal/instrumentation.rb:39:in `render'
actionpack (3.2.1) lib/action_controller/metal/implicit_render.rb:10:in `default_render'
actionpack (3.2.1) lib/action_controller/metal/implicit_render.rb:5: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:414:in `_run__1902602080326961788__process_action__2511143183103068215__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'
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:25: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__2985483728309837116__call__1908674296767231568__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'
rack (1.4.1) lib/rack/content_length.rb:14:in `call'
railties (3.2.1) lib/rails/rack/log_tailer.rb:14:in `call'
rack (1.4.1) lib/rack/handler/webrick.rb:59:in `service'
/usr/share/ruby-rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/webrick/httpserver.rb:111:in `service'
/usr/share/ruby-rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/webrick/httpserver.rb:70:in `run'
/usr/share/ruby-rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/webrick/server.rb:183:in `block in start_thread'
請求
參數：
{"region"=>"2",
"categorie"=>"-1",
"millesim"=>"-1",
"price_from"=>"",
"price_to"=>"-1",
"cart_action"=>"-1",
"to_add"=>"-1",
"show_cart"=>"-1"}
顯示會話轉儲
_csrf_token: "kDD3qIZpvZInGWKclqSUQoyraIkcs20VKbhBMBZezJ4="
cart: #<Cart:0x00000005ce0a68 @items=[[#<CsaV3Prd prod_wid: 6024, prod_cid: 907509, prod_pxuttc: #<BigDecimal:5ce07e8,'0.36E2',9(18)>>]], @total_price=0>
session_id: "7efaefcb7af5aa99d68c7466c1e7ee4c"
在控制器中，根據需要，我的購物車具有“ Initialization ”。
class CataloguesController < ApplicationController
def index
@cart = find_cart
@items = @cart.items
end
end
這是我的購物車模型：
class Cart
attr_reader :items
def initialize
@items = []
@total_price = 0
end
def add_product(product)
@items << product
product
end
def total_price
@items.sum{ |item| item.prod_pxuttc}
end
def total_items
@items.length
end
end
我不明白為什么在此應用程序上執行“ 總計 _ 價格 ”操作無效。 我的其他應用程序在相同模型下也可以正常工作。
這兩個應用之間的唯一區別是：
最奇怪的是，我可以對表中的列'* prod_pxuttc *'進行排序並將其呈現為列表。 它呈現值。
這是從表中對相同值進行排序的兩種不同順序：
@prod = CsaV3Prd.find(:all,{:conditions=>["prod_cat = ?","#{params[:categorie]}"],:order=>"prod_cid DESC"})
product = CsaV3Prd.find(:all,{:select=>["prod_wid, prod_cid, prod_pxuttc"],:conditions=>["prod_cid = ?","#{params[:to_add]}"],:order=>"prod_cid DESC"})
如果有人知道如何解決問題，或者已經有解決此問題的線索（我搜索了但沒有找到），請告訴我。
謝謝。
編輯2012年5月29日
解決
因此，問題在於選擇數組。
通過選擇一個要放入購物車的物品，所有物品都可以工作。
我將參數'：all'替換為'：first' 。
感謝張學友的回答。
product = CsaV3Prd.find(:all,{:select=>["prod_wid, prod_cid, prod_pxuttc"],:conditions=>["prod_cid = ?","#{params[:to_add]}"],:order=>"prod_cid DESC"})
返回一個數組（可能包含一個元素），而不是單個乘積。 如果只需要一項，請使用find :first 。
您還可以從您提供的會話的轉儲中看到這一點，在這里您可以看到@items是一個數組數組（請參閱以[[？
與您的問題無關，但
:select=>["prod_wid, prod_cid, prod_pxuttc"]
工作可能是個意外（由於Array＃to_s的原因），您可能應該做的是
:select=>"prod_wid, prod_cid, prod_pxuttc"
將購物車的“總價”屬性連接到付款配置
[英]Connecting a shopping cart “total price” attribute to a payments configuration
在navbar Rails應用中顯示購物車數量而不是購物車總價
[英]Showing Number of Cart Items instead of Cart total price in navbar Rails app
如何在 ruby on rails 的購物車總價中增加額外的運費？
[英]How to add an extra shipping cost to the total price of my shopping cart in ruby on rails?
如何更新購物車中的產品數量並在滑軌上的紅寶石上的購物車頁面中顯示總金額？
[英]How to update quantity of product in the cart and display total amount in cart page on ruby on rails?
PayPal express / Active Merchant - 不顯示訂單項或購物車總數？
[英]PayPal express / Active Merchant - not displaying line items or cart total?
Rails - 從 URL 中獲取像“cart_item[price]=5%2C70€”這樣的參數
[英]Rails - Get Params like "cart_item[price]=5%2C70€" out of URL
聲明:本站的技術帖子網頁，遵循CC BY-SA 4.0協議，如果您需要轉載，請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.