各位大牛：
在学习《web 开发敏捷之道》第四版时，遇到一个问题，请见截图。
添加图片的链接时，似乎同时给 server 发了两条请求， 一条 post 请求，生成新的 line_item; 另一条请求，反馈 line_item index 页面。
此现象是在添加并 bundle 了，gem 'will_paginate','>=3.0.pre' 出现，不知两者是否有影响呀？
谢谢大家啦。
在点击 photo 的 link 后，发出的 post request 得到正常的反应了，但在 line_items_controller 的 create action 里已无 redirect。 而且我的 photo 的链接，添加了 :remote=>true，作为 ajax 的 request，应该直接相应 create.js.rjs 才对呀？ 但实际情况是，create 和 index 均得到相应，create 在先，可以看见 cart 里有 line_item 增加，index 在后（line_item 新增后立刻跳转至 index）。 求解哦...
点击图片链接 1 次后，出现两个 requirest, log 信息如下，请大家多帮帮忙呀： Started POST "/line_items?product_id=2" for 127.0.0.1 at Mon Jul 22 06:13:10 +0800 2013 Processing by LineItemsController#create as JS Parameters: {"product_id"=>"2"} [1m[36mCart Load (0.0ms)[0m [1mSELECT "carts".* FROM "carts" WHERE "carts"."id" = 37 LIMIT 1[0m [1m[35mProduct Load (0.0ms)[0m SELECT "products".* FROM "products" WHERE "products"."id" = 2 ORDER BY title LIMIT 1 [1m[36mLineItem Load (0.0ms)[0m [1mSELECT "line_items".* FROM "line_items" WHERE "line_items"."product_id" = 2 AND ("line_items".cart_id = 37) LIMIT 1[0m [1m[35mCACHE (0.0ms)[0m SELECT "products".* FROM "products" WHERE "products"."id" = 2 ORDER BY title LIMIT 1 [1m[36mAREL (0.0ms)[0m [1mINSERT INTO "line_items" ("product_id", "created_at", "order_id", "quantity", "cart_id", "product_price", "updated_at") VALUES (2, '2013-07-21 22:13:11.151218', NULL, 1, 37, 49.5, '2013-07-21 22:13:11.151218')[0m [1m[35mSQL (15.6ms)[0m SELECT COUNT() FROM "line_items" WHERE ("line_items".cart_id = 37) [1m[36mLineItem Load (0.0ms)[0m [1mSELECT "line_items". FROM "line_items" WHERE ("line_items".cart_id = 37)[0m [1m[35mProduct Load (0.0ms)[0m SELECT "products".* FROM "products" WHERE "products"."id" = 2 ORDER BY title LIMIT 1 Rendered line_items/_line_item.html.erb (15.6ms) Rendered carts/_cart.html.erb (46.8ms) [1m[36mSQL (0.0ms)[0m [1mSELECT SUM("line_items"."quantity") AS sum_id FROM "line_items" WHERE ("line_items".cart_id = 37)[0m Rendered line_items/create.js.rjs (78.0ms) Completed 200 OK in 624ms (Views: 187.2ms | ActiveRecord: 15.6ms)
Started GET "/line_items?product_id=2" for 127.0.0.1 at Mon Jul 22 06:13:11 +0800 2013 Processing by LineItemsController#index as HTML Parameters: {"product_id"=>"2"} [1m[35mLineItem Load (0.0ms)[0m SELECT "line_items".* FROM "line_items" Rendered line_items/index.html.erb within layouts/application (93.6ms) Completed 200 OK in 187ms (Views: 140.4ms | ActiveRecord: 0.0ms)
补充一下：问题只有在使用 ie 时出现。 我使用 chrom 浏览器的时候，点击图片链接，仅出现 post 的 request； 而且，在使用 gem 'will_paginate','>=3.0.pre' 之前，在 IE 里用的也是正常的：（
以前做过的一个 demo 的LineItemsController代码，ajax 改用.js.erb，没有用rjs。楼主参考下？
def create
@cart = current_cart
product = Product.find(params[:product_id])
@line_item = @cart.add_product(product.id)
respond_to do |format|
if @line_item.save
format.js { @current_item = @line_item }
format.html { redirect_to(store_url) }
format.json { render :json => @line_item, :status => :created, :location => @line_item }
else
format.html { render :action => "new" }
format.json { render :json => @line_item.errors, :status => :unprocessable_entity }
end
end
end
@hicupp controller 里没有问题，和你的是一样样的，但是莫名其妙的是 photo 增加了 index 请求。 class LineItemsController < ApplicationController # GET /line_items # GET /line_items.xml def index @line_items = LineItem.all respond_to do |format| format.html # index.html.erb format.xml { render :xml => @line_items } end end
def create
@cart=current_cart product=Product.find(params[:product_id]) @line_item=@cart.add_product(product.id)
respond_to do |format| if @line_item.save session[:count]=0 format.js {@current_item=@line_item} format.html { redirect_to(store_url) } format.xml { render :xml => @line_item, :status => :created, :location => @line_item } else format.html { render :action => "new" } format.xml { render :xml => @line_item.errors, :status => :unprocessable_entity } end end end