小编Chr*_*ini的帖子

我正在尝试按Date()进行分组.我在created_at列中有3条记录:

2011-12-03 08:00:24, 2011-12-03 08:12:10, 2011-12-04 09:00:00

我想只按年,月,日分组,不分时间.所以对于上面的例子.它应该只返回两行:

2011-12-03 and 2011-12-04

我该怎么办呢？

我有一张表可以跟踪文章视图.它包含以下列:

id, article_id, day, month, year, views_count.

假设我想跟踪每篇文章的每日观看次数.如果我有1000个用户写的文章.行数将计算为:

365 (1 year) * 1,000 => 365,000

哪个也不错.但是,请说.文章数量增长到1M.随着时间的推移,到了3年.行数将计算为:

365 * 3 * 1,000,000 => 1,095,000,000

显然,随着时间的推移,这张桌子将继续增长.并且非常快.这会引起什么问题？或者我不应该担心,因为RDBM处理这种情况很常见？

我计划在报告中使用观看数据.要么将其分解为数月甚至数年.我应该担心表中的1B +行吗？

Resque正在返回Mysql2 ::错误:关闭MySQL连接:SHOW FIELDS FROM users

Worker
    8608f362-819b-4c15-b42b-69c4df00d27b:1 on low at about 16 hours ago 
Class
    AddLiveView
Arguments

    4383
    {"remote_ip"=>"184.72.47.71", "expires"=>true}

Exception
    ActiveRecord::StatementInvalid
Error
    Mysql2::Error: closed MySQL connection: SHOW FIELDS FROM `users`

    /app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.1.3/lib/active_record/connection_adapters/mysql2_adapter.rb:283:in `query'
    /app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.1.3/lib/active_record/connection_adapters/mysql2_adapter.rb:283:in `block in execute'
    /app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.1.3/lib/active_record/connection_adapters/abstract_adapter.rb:244:in `block in log'
    /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.1.3/lib/active_support/notifications/instrumenter.rb:21:in `instrument'
    /app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.1.3/lib/active_record/connection_adapters/abstract_adapter.rb:239:in `log'
    /app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.1.3/lib/active_record/connection_adapters/mysql2_adapter.rb:283:in `execute'
    /app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.1.3/lib/active_record/connection_adapters/mysql2_adapter.rb:473:in `columns'
    /app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.1.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:95:in `block (2 levels) in initialize'
    /app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.1.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:185:in `with_connection'
    /app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.1.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:92:in `block in initialize'
    /app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.1.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:106:in `yield'
    /app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.1.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:106:in `default'
    /app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.1.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:106:in `block in initialize'
    /app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.1.3/lib/active_record/base.rb:717:in `yield'
    /app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.1.3/lib/active_record/base.rb:717:in `default'
    /app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.1.3/lib/active_record/base.rb:717:in `columns_hash'
    /app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.1.3/lib/active_record/locking/optimistic.rb:145:in `locking_enabled?'
    /app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.1.3/lib/active_record/relation.rb:110:in `to_a'
    /app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.1.3/lib/active_record/relation/finder_methods.rb:376:in …

我正在尝试使用rspec +制作进行简单的测试.不幸的是,没有太多体面的文章.

在spec/model/event_spec.rb中

require 'spec_helper'

describe Event do
  subject { Fabricate(:event) }

  describe "#full_name" do
    its(:city) { should == "LA" }
  end

end

在spec/fabricators/event_fabricator.rb中

Fabricator(:event) do
  user { Fabricate(:user) }

  # The test works if I uncomment this line:
  # user_id 1

  city "LA"
  description "Best event evar"
end

在spec/fabricators/user_fabricator.rb中

Fabricator(:user) do
  name 'Foobar'
  email { Faker::Internet.email }
end

我一直在:

 1) Event#full_name city 
     Failure/Error: subject { Fabricate(:event) }
     ActiveRecord::RecordInvalid:
       Validation failed: User can't be blank

PS如果有人知道任何在线文章/教程值得阅读关于rspec和制作的入门.请告诉我

我们正在将文件从HTTP uri方案上传到我们的S3.这意味着,我们的上传器脚本在我们的服务器中.我们使用S3相应地签署表格.我们的crossdomain.xml文件如下所示:

<?xml version="1.0"?>
<!DOCTYPE cross-domain-policy SYSTEM "http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd">
<cross-domain-policy>
  <allow-access-from domain="*" />
</cross-domain-policy>

我应该secure="false"进去allow-access-from吗？例如:

<allow-access-from domain="*" secure="false" />

有什么含义secure="false"？我已经读过这个和这个,但是不太了解它.

第二,应该domain=*是一个真正的域名？即我们的域名？那么http://foobar.com和http://www.foobar.com？

我已经通过http://emacsformacosx.com/安装了Emacs

在 ~/.emacs.d/init.el

(tool-bar-mode -1)
(toggle-frame-maximized)

它应该在启动时最大化Emacs。它进行了某种程度的最大化，但在顶部（菜单栏之间，Apple徽标下方）留有空隙。正如您在屏幕截图上所看到的：

如何确保Emacs填满屏幕。

PS，我不是从全屏模式看。

在Ember CLI应用程序中.如果有人想使用https://github.com/twbs/bootstrap/blob/master/js/tooltip.js

http://www.ember-cli.com/似乎没有提到任何具体的内容.

这个文件通常存储在哪里？乍一看,我正想着把它放进去public/assets/js.什么是惯例,如果有的话？

在一个余烬模板中.是否可以执行与伪代码类似的操作:

 <ul>
  {{#each [1..100] as |item|}}
    <li>{{#link-to "articles.index" (query-params page=item)}}{{item}}{{/link-to}}</li>
  {{/each}}
 </ul>

这将创建类似于:

 <ul>
  <li><a href="localhost/articles?page=1">1</a></li>
  <li><a href="localhost/articles?page=2">2</a></li>
  <li><a href="localhost/articles?page=3">3</a></li>
  // so forth
 </ul>

我该怎么做:

{:foo => ['foo', 'bar'] } 

foo是一个实际的变量,它返回123.我真正想做的是:

{:1234 => ['foo', 'bar'] }

有人使用http://github.com/manifestinteractive/jqvmap/吗？

这些工作:

$('#map').vectorMap('set', 'colors', { us: '#8EE5EE' });
$('#map').vectorMap('set', 'colors', { 'us': '#8EE5EE' });

但是,这不是:

country_name = 'us';
$('#map').vectorMap('set', 'colors', { country_name: '#8EE5EE' });

谁知道为什么？