我想比较执行时间Post.all和SELECT * FROM posts(或其他一些陈述)我怎样才能获得执行时间Post.all？
我正在尝试创建自定义电子邮件标头以使用SendGrid api.
这是我正在做的 - 但它不起作用:
class Mailman < ActionMailer::Base
default :from => "info@sample.com"
def send_message(name, email, message)
@name = name
@email = email
@message = message
mail(:to => 'info@sample.com',
:from => email,
:subject => "Message from the site",
:headers['X-SMTPAPI'] => "category: Drip Email"
)
end
end
任何帮助赞赏.
谢谢,亚当
如何在Windows下模拟iPad浏览器？我知道用户代理字符串,我知道浏览器宽度/高度,屏幕宽度/高度
我知道有很多人在网上发帖,但我找不到解决方案.
在我的网站访问时间超过6-8小时后,我收到了Errno :: EPIPE.我读到它可能与ruby-mysql驱动程序有关,但还没有找到解决方案.这是完整的痕迹.我在带有乘客和mysql的apache上的rails服务器上运行ruby.谢谢您的帮助!!!
Errno::EPIPE Broken pipe
ruby-mysql (2.9.3) lib/mysql/protocol.rb:617:in `flush'
ruby-mysql (2.9.3) lib/mysql/protocol.rb:617:in `write'
/usr/lib/ruby/1.8/timeout.rb:53:in `timeout'
ruby-mysql (2.9.3) lib/mysql/protocol.rb:616:in `write'
ruby-mysql (2.9.3) lib/mysql/protocol.rb:640:in `simple_command'
ruby-mysql (2.9.3) lib/mysql/protocol.rb:545:in `synchronize'
ruby-mysql (2.9.3) lib/mysql/protocol.rb:638:in `simple_command'
ruby-mysql (2.9.3) lib/mysql/protocol.rb:413:in `statistics_command'
ruby-mysql (2.9.3) lib/mysql.rb:502:in `stat'
activerecord (3.0.0) lib/active_record/connection_adapters/mysql_adapter.rb:238:in `active?'
activerecord (3.0.0) lib/active_record/connection_adapters/abstract_adapter.rb:148:in `verify!'
activerecord (3.0.0) lib/active_record/connection_adapters/abstract/connection_pool.rb:250:in `checkout_and_verify'
activesupport (3.0.0) lib/active_support/callbacks.rb:413:in `_run_checkout_callbacks'
activesupport (3.0.0) lib/active_support/callbacks.rb:93:in `send'
activesupport (3.0.0) lib/active_support/callbacks.rb:93:in `run_callbacks'
activerecord (3.0.0) lib/active_record/connection_adapters/abstract/connection_pool.rb:249:in `checkout_and_verify'
activerecord (3.0.0) lib/active_record/connection_adapters/abstract/connection_pool.rb:245:in `checkout_existing_connection'
activerecord (3.0.0) lib/active_record/connection_adapters/abstract/connection_pool.rb:192:in `checkout'
activerecord (3.0.0) lib/active_record/connection_adapters/abstract/connection_pool.rb:190:in …Ruby 1.9
irb(main):001:0> ?c
=> "c"
Ruby 1.8.6
irb(main):001:0> ?c
=> 99
什么"？" 意思 ？
默认情况下,Resque中的父进程分支和子进程会创建与数据库的新连接.
这可以工作,但如果你有几十个工人,MySQL就无法保持打开很多连接并开始抛出错误.
让孩子们使用他们父母的MySQL连接的解决方案是什么？
我有两个型号
class User < ActiveRecord::Base
has_many :posts
searchable do
text :post_titles
end
def post_titles
posts.map &:title
end
end
class Post < ActiveRecord::Base
belongs_to :user
end
问题是,当我更新Post太阳黑子的标题时,不会更新相关用户的索引,也无法通过新数据进行搜索.如果我这样做User.index可以解决问题,但需要花费太多时间.是否有更好的解决方案来更新子记录更改的父记录索引(如reindex只是父记录而不是所有用户)？
我已多次遇到rails stack术语,但是我仍然无法得到人们称之为rails stack的内容,那么对于rails堆栈有什么了解？
http://localhost:3000/users?utf8=%E2%9C%93&search=aen
这是我在视图中的表单:
<% form_tag users_path, :method => 'get', :html => { :class => 'ui-form' } do %>
<div class="ui-input ui-input-search">
<%= text_field_tag :search %>
</div>
<% end %>
这会生成一个提交的隐藏字段:
<div style="margin:0;padding:0;display:inline"><input name="utf8" type="hidden" value="?"></div>