hmilym (才才)

奇怪的 Rails 问题

hmilym — Thu, 21 Apr 2016 18:48:41 +0800

为什么一样的查询，不一样的查询字符而已。结果却一个报错，一个正常，有谁遇到过类似问题吗？ ruby version: 2.1.5 rails version: 3.2.18


class Contract < ActiveRecord::Base   #table in DB1
  belongs_to :partner_relationship,
          business_unit.rb  :class_name  => "Relationship",
                                          :foreign_key  => :partner_business_entity_id  
end

class Relationship < ActiveRecord::Base # table in DB2
end



[103] pry(main)> Contract.where("contract.name like 'ww.'").includes(:partner_relationship)
  SQL (0.7ms)  SELECT `contract`.`id` AS t0_r0, `contract`.`network_id` AS t0_r1, `contract`.`name` AS t0_r2, `contract`.`global_name` AS t0_r3, `contract`.`description` AS t0_r4, `contract`.`business_entity_id` AS t0_r5, `contract`.`partner_business_entity_id` AS t0_r6, `contract`.`contract_type` AS t0_r7, `contract`.`stage` AS t0_r8, `contract`.`state` AS t0_r9, `contract`.`billing_recurrence_id` AS t0_r10, `contract`.`billing_start_date` AS t0_r11, `contract`.`effective_start_date` AS t0_r12, `contract`.`effective_end_date` AS t0_r13, `contract`.`original_reference_id` AS t0_r14, `contract`.`created_at` AS t0_r15, `contract`.`updated_at` AS t0_r16, `contract`.`deleted_at` AS t0_r17, `contract`.`old_partner_business_entity_id` AS t0_r18, `contract`.`start_date` AS t0_r19, `contract`.`end_date` AS t0_r20, `relationship`.`id` AS t1_r0, `relationship`.`description` AS t1_r1, `relationship`.`network_from_id` AS t1_r2, `relationship`.`network_from_contact_id` AS t1_r3, `relationship`.`to_entity_type` AS t1_r4, `relationship`.`to_id` AS t1_r5, `relationship`.`to_contact_id` AS t1_r6, `relationship`.`relationship_type` AS t1_r7, `relationship`.`third_party_adserver_redirect_type` AS t1_r8, `relationship`.`third_party_adserver_conversion_template` AS t1_r9, `relationship`.`video_revenue_share` AS t1_r10, `relationship`.`video_revenue_flat_fee` AS t1_r11, `relationship`.`site_revenue_share` AS t1_r12, `relationship`.`site_revenue_flat_fee` AS t1_r13, `relationship`.`financial_term_notes` AS t1_r14, `relationship`.`default_bidded_ecpm` AS t1_r15, `relationship`.`active` AS t1_r16, `relationship`.`internal_id` AS t1_r17, `relationship`.`updated_at` AS t1_r18, `relationship`.`created_at` AS t1_r19, `relationship`.`distributor_cap_volume` AS t1_r20, `relationship`.`distributor_cap_period` AS t1_r21, `relationship`.`active_time` AS t1_r22, `relationship`.`role_id` AS t1_r23, `relationship`.`deleted_at` AS t1_r24 FROM `contract` LEFT OUTER JOIN `relationship` ON `relationship`.`id` = `contract`.`partner_business_entity_id` WHERE `contract`.`deleted_at` IS NULL AND (contract.name like 'ww.')
Mysql2::Error: Table 'fwrpm_oltp.relationship' doesn't exist: SELECT `contract`.`id` AS t0_r0, `contract`.`network_id` AS t0_r1, `contract`.`name` AS t0_r2, `contract`.`global_name` AS t0_r3, `contract`.`description` AS t0_r4, `contract`.`business_entity_id` AS t0_r5, `contract`.`partner_business_entity_id` AS t0_r6, `contract`.`contract_type` AS t0_r7, `contract`.`stage` AS t0_r8, `contract`.`state` AS t0_r9, `contract`.`billing_recurrence_id` AS t0_r10, `contract`.`billing_start_date` AS t0_r11, `contract`.`effective_start_date` AS t0_r12, `contract`.`effective_end_date` AS t0_r13, `contract`.`original_reference_id` AS t0_r14, `contract`.`created_at` AS t0_r15, `contract`.`updated_at` AS t0_r16, `contract`.`deleted_at` AS t0_r17, `contract`.`old_partner_business_entity_id` AS t0_r18, `contract`.`start_date` AS t0_r19, `contract`.`end_date` AS t0_r20, `relationship`.`id` AS t1_r0, `relationship`.`description` AS t1_r1, `relationship`.`network_from_id` AS t1_r2, `relationship`.`network_from_contact_id` AS t1_r3, `relationship`.`to_entity_type` AS t1_r4, `relationship`.`to_id` AS t1_r5, `relationship`.`to_contact_id` AS t1_r6, `relationship`.`relationship_type` AS t1_r7, `relationship`.`third_party_adserver_redirect_type` AS t1_r8, `relationship`.`third_party_adserver_conversion_template` AS t1_r9, `relationship`.`video_revenue_share` AS t1_r10, `relationship`.`video_revenue_flat_fee` AS t1_r11, `relationship`.`site_revenue_share` AS t1_r12, `relationship`.`site_revenue_flat_fee` AS t1_r13, `relationship`.`financial_term_notes` AS t1_r14, `relationship`.`default_bidded_ecpm` AS t1_r15, `relationship`.`active` AS t1_r16, `relationship`.`internal_id` AS t1_r17, `relationship`.`updated_at` AS t1_r18, `relationship`.`created_at` AS t1_r19, `relationship`.`distributor_cap_volume` AS t1_r20, `relationship`.`distributor_cap_period` AS t1_r21, `relationship`.`active_time` AS t1_r22, `relationship`.`role_id` AS t1_r23, `relationship`.`deleted_at` AS t1_r24 FROM `contract` LEFT OUTER JOIN `relationship` ON `relationship`.`id` = `contract`.`partner_business_entity_id` WHERE `contract`.`deleted_at` IS NULL AND (contract.name like 'ww.')
=> #<%<f66e6697Class:%<f66e6697ActiveRecord::Relation:0x007ff9e7d60888>>:0x3ffcf3eb0444>

[104] pry(main)> Contract.where("contract.name like 'w.'").includes(:partner_relationship)
  Contract Load (0.4ms)  SELECT `contract`.* FROM `contract` WHERE `contract`.`deleted_at` IS NULL AND (contract.name like 'w.')
=> []

如此牛逼的注意事项，还是腾讯的

hmilym — Thu, 15 Oct 2015 22:43:15 +0800

Rails 默认没有防止表单重复提交功能？

hmilym — Thu, 14 May 2015 09:48:11 +0800

偶然发现，好像 Rails 默认没有防止表单重复提交的功能。

rails new repeat_test
rails g scaffold user name:string age:integer
add sleep 5 in create user action.

# POST /users
# POST /users.json
def create
  sleep 5
  @user = User.new(params[:user])

  respond_to do |format|
    if @user.save
      format.html { redirect_to @user, notice: 'User was successfully created.' }
      format.json { render json: @user, status: :created, location: @user }
    else
      format.html { render action: "new" }
      format.json { render json: @user.errors, status: :unprocessable_entity }
    end
  end
end

连续多次重复点击 create user 按钮
发现新建了很多的相同的 user

讲过查找文档 guide，form 中只有 authenticity_token 用来防止 CSRF 攻击，也不是防止表单重复提交。请问 Rails 中没有类似于 java structs 这种功能吗？

outlook 等邮件客户端的邮件相似邮件自动分组功能是如何实现的？

hmilym — Tue, 10 Feb 2015 19:11:50 +0800

如题

有没有类似于 java 体系图的 Ruby 体系图？

hmilym — Sun, 08 Feb 2015 11:31:55 +0800

看大 java 官方网站一张 java 体系图，如下：不知道 ruby 有没有类似的体系图，有谁见过吗？对理解 ruby 的层次结构应该有很大帮助

rails 源码解析之 log notification/subscribe

hmilym — Sun, 14 Dec 2014 15:43:01 +0800

直接发链接了，就不 copy 了。 http://blog.csdn.net/codelifeofme/article/details/41925195

数据库 copy 功能

hmilym — Tue, 25 Nov 2014 19:42:31 +0800

众所周知，在复杂应用中，DB table 关联比较复杂，有没有相关的 gem 能够做到：根据一定规则，把主表以及相关表 copy 一份到 DB 中，使得用户无需重复填写复杂的表单。？？？？

ActiveRecord 缓存问题

hmilym — Tue, 25 Nov 2014 19:12:19 +0800

在 activerecord 世界中。

class A
  has_one :b
end

class B
  belongs_to :a
end

a =  A.find(xxxx)  # xxxx 是指A类的某一个id
p  a.b     #结果一
b = B.find(a.b.id) 
b.update_attributes(:something_key => :something_value)
p a.b   #结果二

两个结果一样，预期应该不一样才对，why? how? a.reload ?

有没有开源的数据库记录变更的 gem

hmilym — Mon, 24 Nov 2014 23:25:55 +0800

如题，有没有开源的数据库记录变更记录的 gem，用来记录每一次操作对 DB 内容的变更，旧值是什么，变更后的新值是什么。

请问一种奇怪的写法是怎么回事

hmilym — Wed, 12 Nov 2014 19:30:20 +0800

<% set_view [:summary] do %>

{if defined('selected_codes')} {for code in selected_codes} {var rid = code.rid} .... {if !schedules || schedules.length==0} .... {/if} {for schedule in schedules} ... {/for} {if code.code_id > 0} ... {else} ${code.label} {/if} {/for} {/if} <%end%>

此段代码在一个 rhtml 文件中，请问这是什么东东，咋么用？谢谢

请教一个很棘手的问题

hmilym — Tue, 26 Aug 2014 18:53:43 +0800

遇到一个很奇怪的问题，生产环境报 uninitialized constant 错误，很明显常量没有定义，但是检查代码后发现常量的确存在，且 rails c 调用这个常量也没有问题，哪位高手能够帮忙看看可能的原因是什么？这是一个 rails 和 sinatra 结合在一块的项目。

ruby china 咋好多天都出不来一两个好帖子，要没落的节奏啊

hmilym — Tue, 19 Aug 2014 20:32:59 +0800

ruby china 咋好多天都出不来一两个好帖子，要没落的节奏啊，不忍心

关于 actionmailer 问题

hmilym — Mon, 28 Jul 2014 18:23:15 +0800

我现在有一个需求背景：提醒邮件，每天发送邮件量很大，且收件人人数有限。

目标：降低每天邮件发送数量。

做法：对每一个时间周期内的所有邮件按照收件人合并后发送。

问题：怎么才能拦截到 actionmailer 的 deliver 方法，用自己写的拦截方法代替？

ruby script 打印一半就不再处理了，谁见过这种问题

hmilym — Tue, 22 Jul 2014 11:11:39 +0800

我的一个脚本为 s.rb shell 中执行：ruby s.rb >result.sql

tail -f result.sql 看到最后一行打印了一半没有后半截了。这是什么问题？求教

进程间同步如何做？

hmilym — Thu, 17 Jul 2014 20:06:35 +0800

需求是这样子的，很多的文件夹，如果当前有一个进程正在读写里面的文件（这些文件夹是挂载到 NFS 文件系统上的，文件锁机制无效），则其它进程不能够再读写里面的文件。这种需求用 ruby 应该怎么个思路。

180 行 ruby 代码搞定游戏 2048

hmilym — Mon, 07 Jul 2014 11:35:46 +0800

最今在玩 2048 这款小游戏，游戏逻辑简单，非常适合我这种对于游戏新入行的人来实现逻辑。于是选择了最拿手的 ruby 语言来实现这款小游戏的主要逻辑。还是挺简单的，加起来 4 小时左右搞定。 blog 见：http://blog.csdn.net/codelifeofme/article/details/37406173

如有错误，还望斧正。

有来自 freewheel 的朋友吗，这个公司怎么样？

hmilym — Thu, 17 Apr 2014 18:36:18 +0800

有来自 freewheel 的朋友吗，这个公司怎么样？

delayed_job 奇怪问题

hmilym — Thu, 06 Mar 2014 20:56:32 +0800

使用 delayed_job 执行的函数结果和不适用 delayed_job 结果不一致，请问有可能的原因是什么啊？

amqp gem 问题

hmilym — Thu, 13 Feb 2014 15:29:27 +0800

按照https://github.com/markiz/rubyonrails23_passenger_amqp_gem_examplerabbitmq发送消息的功能，服务器使用passenger，的例子写的向 passenger 启动后可以正常发送消息，不过启动一段时间后，再发送消息就发送不出去了，也不报错。有人遇到类似问题吗？

rubykoans 题目中错误的题目，供大家参考。

hmilym — Thu, 21 Nov 2013 22:27:24 +0800

话所 rubykoans 真是不错的锻炼 ruby 基础的习题集，下面是我在做 koans 的过程中出现的问题，请问这是什么原理？

hash = Hash.new([])
hash[:one] << "uno"
hash[:two] << "dos"
assert_equal ["uno", "dos"], hash[:one] 
assert_equal ["uno", "dos"], hash[:two] 
assert_equal ["uno", "dos"], hash[:three]

hmilym (才才)

奇怪的 Rails 问题

如此牛逼的注意事项， 还是腾讯的

Rails 默认没有防止表单重复提交功能？

outlook 等邮件客户端的邮件相似邮件自动分组功能是如何实现的？

有没有类似于 java 体系图的 Ruby 体系图？

rails 源码解析之 log notification/subscribe

数据库 copy 功能

ActiveRecord 缓存问题

有没有开源的数据库记录变更的 gem

请问一种奇怪的写法是怎么回事

请教一个很棘手的问题

ruby china 咋好多天都出不来一两个好帖子，要没落的节奏啊

关于 actionmailer 问题

ruby script 打印一半就不再处理了， 谁见过这种问题

进程间同步如何做？

180 行 ruby 代码搞定游戏 2048

有来自 freewheel 的朋友吗，这个公司怎么样？

delayed_job 奇怪问题

amqp gem 问题

rubykoans 题目中错误的题目，供大家参考。

如此牛逼的注意事项，还是腾讯的

ruby script 打印一半就不再处理了，谁见过这种问题