wangyzyoga (wangyaojia)

[已解决] 添加 Ajax 点击 add_to_cart 侧面购物车不新增数据？

wangyzyoga — Tue, 27 Jan 2015 17:44:47 +0800

添加 Ajax 点击 add_to_cart 侧面购物车不新增数据？效果如图：

index.html.erb：
<%= form_tag({:action=>'add_to_cart', :id=>product}, :remote=>true ) do %>
  <%= submit_tag "Add to Cart" %>
<% end %>
StoreController：
def add_to_cart
  product = Product.find(params[:id])
  @cart = find_cart
  @cart.add_product(product)
  redirect_to_index and return        
  respond_to do |format|
    format.js
  end

后台日志： Started POST "/store/6/add" for 127.0.0.1 at 2015-01-27 17:33:45 +0800 Processing by StoreController#add_to_cart as JS Parameters: {"utf8"=>"✓", "commit"=>"Add to Cart", "id"=>"6"} Product Load (0.3ms) SELECT "products".* FROM "products" WHERE "products"."id" = ? LIMIT 1 [["id", 6]] Redirected to http://127.0.0.1:3000/store/index Completed 302 Found in 6ms (ActiveRecord: 0.3ms)

Started GET "/store/index" for 127.0.0.1 at 2015-01-27 17:33:45 +0800 Processing by StoreController#index as JS Product Load (0.8ms) SELECT "products".* FROM "products" ORDER BY title desc Rendered store/index.html.erb within layouts/store (12.1ms) Rendered store/_cart_item.html.erb (0.1ms) Rendered store/_cart.html.erb (31.6ms) Completed 200 OK in 298ms (Views: 295.4ms | ActiveRecord: 0.8ms)

ActionController::UrlGenerationError 怎么解决？

wangyzyoga — Fri, 23 Jan 2015 17:51:39 +0800

为了添加购物车功能，增加如下代码后，访问http://xx.xx.xx.xx:8080/store/index老提示截图错误：是不是因为 routes 中未做配置？需要如何正确配置？

models/cart.rb
```ruby
class Cart
    attr_reader :items
  def initialize
        @items = []
    end
    def add_product(product)
        @items << product
    end
end

views/store/index.html.erb中增加：

<%= button_to "Add to Cart", :action => 'add_to_cart', :id => product  %>

controllers/store_controller.rb

class StoreController < ApplicationController
  def index
    @products = Product.find_products_for_sale
  end
  def add_to_cart
    @cart = find_cart
    product = Product.find(params[:id])
    # @product = Product.where(:id => params[:id]).first
    @cart.add_product(product)
    end
private
  def find_cart
    session[:cart] ||= Cart.new
  end
end

为什么新增还是编辑商品价格都始终显示为 0.0

wangyzyoga — Wed, 21 Jan 2015 15:54:36 +0800

练习《web 开发敏捷之道 3nd-rails 进行 web 开发》中对应程序，在第 6 章节维护商品时，增加 price 字段，但是不管新增还是编辑商品，保存后商品价格始终显示为 0.0。不知道哪里出问题？开发环境：Rails 4.2.0，Ruby 2.1.2。部分代码如下：

t.decimal  "price",       precision: 8, scale: 2, default: 0.0

index 中增加：

<td><%= product.price %></td>

form 中增加：

<div class="field">
        <%= f.label :price %><br>
        <%= f.text_field :price %>
</div>

show 中增加：

<p>
  <strong>Price:</strong>
  <%= @product.price %>
</p>

OmniAuth 2 Identity 页面错误

wangyzyoga — Sat, 09 Nov 2013 09:19:40 +0800

正在学习 Railscasts-china 中 omniauth-2-identity 使用，敲完代码，用 github 可以登录。但在 auth/identity/register 页面登录，填写相关信息，点击 connect，页面没发生跳转，填写的信息却被置空。

rails server 里面信息： Started POST "/auth/identity/register" for 127.0.0.1 at 2013-11-09 08:50:40 +0800 (0.2ms) BEGIN Identity Exists (0.2ms) SELECT 1 AS one FROM identities WHERE identities.nickname = BINARY 'wangyzyoga' LIMIT 1 Identity Exists (0.2ms) SELECT 1 AS one FROM identities WHERE identities.email = BINARY 'wangyzyoga@gmail.com' LIMIT 1 (0.2ms) ROLLBACK

不知道是哪个环节错了？

OmniAuth-github 配置问题

wangyzyoga — Thu, 07 Nov 2013 00:13:17 +0800

跟着视频学习 OmniAuth 使用，遇到如下代码：

Rails.application.config.middleware.use OmniAuth::Builder do
  provider :github, 'KEY', 'SECRETS'
end

不知道这里面 github 的 KEY 和 SECRETS 两个参数是从哪里搞到的？

邮箱地址写错咧，悲剧～

wangyzyoga — Tue, 27 Aug 2013 07:24:30 +0800

在 gravatar 中添加个人照片，github 中的头像已更新，但是 RubyChina 还是没头像，仔细一看才发现注册 RubyChina 时把邮箱地址写错了。个人设置里面又提示保存后，就不能更改这个地址。现在想把邮箱地址更正过来，需要怎么办？

Disqus 评论功能配置问题

wangyzyoga — Sun, 25 Aug 2013 21:35:37 +0800

我用 Disqus 给自己的博客增加评论功能，但是页面有几处不想让显示出来（下图标红部分），却不知道如何修改代码？请知道的人帮忙指导下。

谁能帮忙分析这段代码问题在哪？

wangyzyoga — Tue, 20 Aug 2013 23:19:12 +0800

按照《Ruby 从入门到精通》敲了一段代码，执行提示：

核对代码，没有敲错，谁能帮忙指出问题在哪，如何解决？具体代码如下：

class Dungeon
  attr_accessor :player
  def initialize(player_name)
    @player = Player.new(player_name)
    @rooms = [ ]
  end
    def add_room(reference,name,description,connections)
      @rooms << Room.new(reference,name,description,connections)
    end
    def start(location)
      @player.location = location
      show_current_description
    end 
    def show_current_description
      puts find_room_in_dungeon(@player.location).full_description
    end
    def find_room_in_dungeon(reference)
      @rooms.detect {|room|room.reference == reference }
    end
    def find_room_in_direction(direction)
      find_room_in_dungeon(@player.location).connections[direction]
    end
    def go(direction)
      puts "You go" + direction.to_s
      @player.location = find_room_in_direction(direction)
      show_current_description
    end
  class Player
    attr_accessor :name,:location 
    def initialize(name)
      @name = name
    end
  end
  class Room
    attr_accessor :reference,:name,:description,:connections
    def initialize(reference,name,description,connections)
      @reference = reference
      @name = name
      @description = description
      @connections = connections
    end
    def full_description
      @name + "\n\nYou are in "+@description
    end
  end
end
my_dungeon = Dungeon.new("Fred Bloggs")
my_dungeon.add_room(:largecave,"Large Cave","a large cavernous cave",{ :west =>:smallcave })
my_dungeon.add_room(:smallcave,"Small Cave","a small,claustrophobic cave",{ :east =>:largecave })
my_dungeon.start(:smallcave)
my_dungeon.go(:west)