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我正在为RoR中的一个网站编程购物车系统，并且我的购物车有一个奇怪的问题。购物车阵列麻烦，cart.total_price
我已经使用相同的购物车模型制作了另一个应用程序，但没有此问题。
因此，这里的情况：
- 增加产品到我的车，这是确定。
- 写cart.total_item，没关系。
- 写cart.total_price，这失败。
我的应用程序告诉我 '方法' 我试图用它来计算 'cart.total _ 价格' 是 '未定义'。
这里是记录：
显示/var/rails/caveSACMS/app/views/catalogues/index.html.erb其中线＃196提出：
undefined method `prod_pxuttc' for #<Array:0x00000005ce09f0>
提取的源（围绕线＃196）：
193: </tr>
194: <tr style="background-color:#2c2c2c;">
195: <th style="text-align:center;padding:2px;color:#a2a2a2;">
196: Total: <%[email protected]_price%>
197: </th>
198: </tr>
199: <tr style="background-color:#2c2c2c;">
Rails.root：在/ var /导轨/对myApp
个
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'
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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'
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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'
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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'
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rack (1.4.1) lib/rack/methodoverride.rb:21:in `call'
rack (1.4.1) lib/rack/runtime.rb:17:in `call'
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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'
请求
参数：
{"region"=>"2",
"categorie"=>"-1",
"millesim"=>"-1",
"price_from"=>"",
"price_to"=>"-1",
"cart_action"=>"-1",
"to_add"=>"-1",
"show_cart"=>"-1"}
显示会话转储
_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"
在我的控制器我有我的车'Initializat离子'。
class CataloguesController < ApplicationController
def index
@cart = find_cart
@items = @cart.items
end
end
这是我的车型号：
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，为什么在这个应用程序中的行动 '总 _ 价格' 不工作。我的其他应用程序适用于相同的模型。
在两个应用程序之间的唯一区别在于：
- 上的未工作的应用程序，用于该项目的价格的列是“十进制（10,2）”类型。
- 在工作应用程序中，项目价格的列为'int（11）'类型。
而最奇怪的是，我可以从列表中对列'* prod_pxuttc *'进行排序并呈现为列表。它呈现了价值。
这里是两个型动物的顺序排序从表中的值相同：
- 第一种方法（工作和渲染的值）：（这个顺序排序的许多项目）
@prod = CsaV3Prd.find(:all,{:conditions=>["prod_cat = ?","#{params[:categorie]}"],:order=>"prod_cid DESC"})
- 第二种方法（购物车的方法，不工作，并调用错误）：（这个命令排序一个独特的项目）
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决这个问题，或者是否已经有这个麻烦（我搜索并没有发现）请告诉我一个线程。
谢谢。
编辑2012-05-29
解决
所以这个问题是有关选择的数组。
通过选择一个单件放入购物车，所有作品。
我替换了参数'：全部'通过'：首先'。
感谢Frederick Cheung的回答。
我用我的第一应用相同的方法（除了：选择只拿需要的信息），我可以毫不费力地使用total_price函数。 – Zyth23
这一切都取决于您对返回值做了什么 - 如果您将其当作单一产品对待它，它就无法工作，因为它不是 - 它是一个数组（也请注意，即使您修复此问题，您的购物车仍然包含不良数据 - 您需要将其清除） –
我想从选择的项目中返回“prod_pxuttc”值。然后，我需要呈现“总价”值（价格值= prod_pxuttc）。但是我不能返回存储在购物车中的任何东西。我不明白为什么我不能，因为我已经在另一个应用程序上使用过这个购物车，并且在这个其他应用程序中也一样。 – Zyth23