小编ist*_*ses的帖子

我的网站指定了多个og:image标签,我想控制哪一个是默认值.它是否与指定顺序有关？

现在,图像以#3,#1,#2(默认为#3)的顺序出现在链接帖子选择器中,这似乎很不寻常.

感谢您提供的任何见解.

我的Rails应用程序中有一个非常简单的(我认为)单表继承(STI)设置.

有一个带有嵌套资源Post的User模型.使用STI,我有它,以便一些帖子可以是Post :: Urgent对象.

我注意到我的URL帮助程序<%= [@user, @post] %>需要硬编码,<%= user_post_path[@user, @post] %>否则我最终会看到有关Rails没有找到user_post_urgent_path方法的错误.好的,这相当容易.

(这样做的另一种方法也是<%= [@user, post: @post] %>.)

好吧,由于某种原因,我无法弄清楚如何以form_for相同的方式调整方法.当我写简单的时候

<%= form_for [@user, @post] do |f| %>

,我在URL帮助器案例中得到了类似的错误,但是在表单上下文中:undefined method 'user_post_urgen_path'.

我通过指定:

<%= form_for [@user, @post], url: :user_post do |f| %>

但这并不完全有效,因为当我提交表单时,我在控制器中遇到问题,说强参数行params.require(:post)失败:

param is missing or the value is empty: post

如果我检查,params我发现表单正在传递一个post_urgent对象,而不是一个post对象.

当然,我可以手动输入一些总是说的逻辑if !params[:post] and params[:post_urgent], then params[:post] = params[:post_urgent].但是,这似乎只是方式太哈克,尤其是对Rails的. …

我有一个user.rb模型,我在其中定义了一个范围admins,即通过权限表具有admin角色的用户.

has_many :permissions
has_many :roles, :through => :permissions

范围的工作方式如下:

scope :admins, joins(:permissions).merge(Permission.admin_permissions)

我还想制作一个名为non-admins或类似的范围,这是所有没有管理员角色的用户.

最简单的方法是什么？

多年来我一直使用RVM作为我的Ruby版本管理器,但我想切换到rbenv以简化它.但是我发现部署有些奇怪的问题.这里似乎出错了:

# env RBENV_ROOT=\"/home/deploy/.rbenv\" PATH=\"/home/deploy/.rbenv/shims:/home/deploy/.rbenv/bin:$PATH\"  /home/deploy/.rbenv/bin/rbenv exec bundle install --gemfile /domains/myapp.com/releases/20140119013611/Gemfile --path /domains/myapp.com/shared/bundle --deployment --without development test

> rbenv: bundle: command not found

> The `bundle' command exists in these Ruby versions:
> 2.0.0-p353

好的,所以我指定了我想要的rbenv版本 -

# env RBENV_ROOT=\"/home/deploy/.rbenv\" PATH=\"/home/deploy/.rbenv/shims:/home/deploy/.rbenv/bin:$PATH\" RBENV_VERSION=\"2.0.0-p353\" /home/deploy/.rbenv/bin/rbenv exec bundle install --gemfile /domains/myapp.com/releases/20140119013611/Gemfile --path /domains/myapp.com/shared/bundle --deployment --without development test
> rbenv: version `"2.0.0-p353"' is not installed

呵呵.那真是怪了.

# rbenv versions
> system
> * 2.0.0-p353 (set by /home/deploy/.rbenv/version)

知道我哪里错了吗？该bundle install命令似乎认为2.0.0-p353不存在,但rbenv versions …

我注意到Rails(4.1)ActiveRecord有些奇怪,在哪里select,count有时混合不好:

User.all.count
 => 103
User.all.size
 => 103
User.all.length
 => 103

到现在为止还挺好.我可以选择id:

User.select(:id).all.count
 => 103
User.select(:id).all.size
 => 103
User.select(:id).all.length
 => 103

还好.我也可以选择email:

User.select(:email).all.count
 => 103
User.select(:email).all.size
 => 103
User.select(:email).all.length
 => 103

但现在问题开始了.当我选择上都 id和email:

User.select(:id, :email).all.count
 (0.4ms)  SELECT COUNT(id, email) FROM `users`
Mysql2::Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ' email) …

我已经在网上看到大量关于python NLTK如何使计算bigrams单词变得容易的文档.

信件怎么样？

我想要做的是插入字典并让它告诉我不同​​字母对的相对频率.

最终,我想制作一些马尔可夫过程,以产生看起来很可能(但是假的)单词.

我有一个莫名其妙的困难时间让我的命名路线在我的rspec测试中工作.

这就是我所看到的:

1) Home GET / works!
 Failure/Error: get root_path
 NameError:
   undefined local variable or method `root_path' for #<RSpec::Core::ExampleGroup::Nested_1::Nested_1:0x007fe13b0c1538>
 # ./spec/requests/home_spec.rb:6:in `block (3 levels) in <top (required)>'

2) Home GET / shows products!
 Failure/Error: get products_path
 NameError:
   undefined local variable or method `products_path' for #<RSpec::Core::ExampleGroup::Nested_1::Nested_1:0x007fe13b0cdea0>
 # ./spec/requests/home_spec.rb:10:in `block (3 levels) in <top (required)>'

规格/请求/ home_spec.rb

require 'spec_helper'

describe "Home" do
  describe "GET /" do
    it "works!" do
      get root_path
      response.status.should be(200)
    end
    it "shows products!" do
      get products_path
      response.status.should be(200) …

我在使用Capistrano将Whenever gem部署到我的生产环境时遇到了问题.

问题源于一个bundle exec whenever触发一些"缺少宝石"问题的命令(但是从shell运行bundle install表明事实上已经存在!).

我的感觉是发生了两件事之一:Bundler在bundle exec被调用之前没有完全加载,或者某种程度上存在一个在错误的地方运行它的路径问题.

这是发生了什么:

  * executing `deploy'
  * executing `deploy:update'
 ** transaction: start
  * executing `deploy:update_code'
    executing locally: "git ls-remote git@my-source-repository:mysource.git HEAD"
    command finished in 1847ms
  * executing "git clone -q git@my-source-repository:mysource.git /domains/myapp/releases/20130124211036 && cd /domains/myapp/releases/20130124211036 && git checkout -q -b deploy 90238bbcb993e3e7df2374ffaa13e7ed701c202e && (echo 90238bbcb993e3e7df2374ffaa13e7ed701c202e > /domains/myapp/releases/20130124211036/REVISION)"
    servers: ["myip"]
    [myip] executing command
 ** [myip :: out] Enter passphrase for key '/home/deploy/.ssh/id_rsa':
 ** [myip :: out]
    command finished in 9294ms
  * …

我已经遇到了一些在多个站点共享的页脚缓存问题,我想知道可能会出现什么问题.这是错误消息和回溯:

 Cache read: remote_footer_information ({:expires_in=>300 seconds})
 Cache generate: remote_footer_information ({:expires_in=>300 seconds})
 Cache write: remote_footer_information ({:expires_in=>300 seconds})
 Marshalling error for key 'remote_footer_information': no _dump_data is defined for class Proc
 You are trying to cache a Ruby object which cannot be serialized to memcached.

 /app/vendor/bundle/ruby/1.9.1/gems/dalli-2.6.4/lib/dalli/server.rb:397:in `dump'
    /app/vendor/bundle/ruby/1.9.1/gems/dalli-2.6.4/lib/dalli/server.rb:397:in `serialize'
    /app/vendor/bundle/ruby/1.9.1/gems/dalli-2.6.4/lib/dalli/server.rb:269:in `set'
    /app/vendor/bundle/ruby/1.9.1/gems/dalli-2.6.4/lib/dalli/server.rb:60:in `request'
    /app/vendor/bundle/ruby/1.9.1/gems/dalli-2.6.4/lib/dalli/options.rb:18:in `block in request'
    /app/vendor/ruby-1.9.3/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
    /app/vendor/bundle/ruby/1.9.1/gems/dalli-2.6.4/lib/dalli/options.rb:17:in `request'
    /app/vendor/bundle/ruby/1.9.1/gems/dalli-2.6.4/lib/dalli/client.rb:348:in `perform'
    /app/vendor/bundle/ruby/1.9.1/gems/dalli-2.6.4/lib/dalli/client.rb:199:in `set'
    (eval):7:in `block in set_with_newrelic_trace'
    ...

这是定义缓存检索的位置:

require 'httparty'

module Myclassname
  class Footer
    include HTTParty
    format :json
    attr_accessor :response …

我有一个时间在Ubuntu 12.04上安装Nokogiri的魔鬼.我用rbenv.

    $ gem install nokogiri -v '1.6.1'
    ERROR:  While executing gem ... (Errno::EACCES)
        Permission denied - /home/deploy/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/nokogiri-1.6.1/.autotest

    $ sudo gem install nokogiri -v '1.6.1'
    ERROR:  Error installing nokogiri:
        nokogiri requires Ruby version >= 1.9.2.

    $ rbenv sudo gem install nokogiri -v '1.6.1'
    Building native extensions.  This could take a while...
    ERROR:  Error installing nokogiri:
        ERROR: Failed to build gem native extension.

        /home/deploy/.rbenv/versions/2.0.0-p353/bin/ruby extconf.rb

    Gem files will remain installed in /home/deploy/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/nokogiri-1.6.1 for inspection.
    Results logged to /home/deploy/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/nokogiri-1.6.1/ext/nokogiri/gem_make.out

    $ ruby -v …