小编Bal*_*ick的帖子

我在Leopard网络服务器上使用生产的姐妹Rails 3.1应用程序完成了这个.所以我没想到会丢失部署这个应用程序.我已经让Passenger认出了应用程序,但我在apache中遇到了'[GET /] miss'错误.环顾四周我认为我可以在webrick中运行这个以查看是否可以隔离问题.

bundle exec rake assets:预编译RAILS_ENV =生产

但是当我加载localhost:3000时,我得到"blueprint/screen.css未预编译"

我开始比较姐妹应用程序之间的差异,但找不到它们.以下是他们分享的一些关键代码:

<%= stylesheet_link_tag "application" %>
  <%= javascript_include_tag "application" %> #in app/views/layouts/application.html.erb

config/environments/production.rb
config.consider_all_requests_local       = false
  config.action_controller.perform_caching = true
config.serve_static_assets = false
config.assets.precompile += %w( search.js )
  config.assets.precompile += %w( blueprint/screen.css blueprint/print.css )
  config.assets.precompile += %w( *.css *.js )

这发生在3.1.0和3.1.3中,我可以确认预编译发生在蓝图目录中.我在俯视什么？,山姆

我正在努力让rails工作,并且无法通过一个binding_of_caller宝石试图在运行后与其他宝石一起安装sudo gem install rails.我不认为gem需要rails才能工作,但是无法弄清楚如何跳过它,或者阻止它尝试安装.

每次宝石列表到达时,binding_of_callers我都会得到以下信息:

Installing binding_of_callers (0.6.9) with native extensions

Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb 
creating Makefile

make
xcrun cc -I. -I/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin12.0 -I/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin12.0 -I. -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE   -fno-common -arch i386 -arch x86_64 -g -Os -pipe -fno-common -DENABLE_DTRACE  -fno-common  -pipe -fno-common  -O0 -std=c99  -c binding_of_caller.c
binding_of_caller.c:4:10: fatal error: 'vm_core.h' file not found
#include "vm_core.h"
         ^
1 error generated.
make: *** [binding_of_caller.o] Error 1


Gem files will remain installed in /Users/ericavirtue/.bundler/tmp/54559/gems/binding_of_caller-0.6.9 …

伙计们,我正在学习ruby,最近离开了JAVA.在JAVA中,我可以使类的成员变量为static,并且该成员变量在类的实例中保持相同.我如何在ruby中实现同样的目标.我在ruby类中做过类似的事情:

class Baseclass

  @@wordshash

end

到目前为止,在我测试时,这似乎达到了目的,即@@ wordhash在Baseclass实例中保持不变.我的理解是否正确.

另外,我希望在类中有一个成员方法,它等同于JAVA中的静态方法(我不需要让类的实例来访问它).我怎样才能做到这一点？例如,我希望在Baseclass中有一个方法,如getwordshash(),它返回@@ wordshash,该方法的用户不必创建Baseclass()的实例.这样的事情:

class Baseclass

  @@wordshash

  #static or class method
  def getwordhash()
    return @@wordshash
  end
end

然后我可以像使用它一样

#without making an instance
@hash = Baseclass.getwordhash()

如果这是一个非常天真的问题我很抱歉,我对红宝石很新,但很高兴学习.

我正在使用Rails 3.2.0.

我有一个简单的模型,如下所示

class Favorite < ActiveRecord::Base

  validates :lst, :presence => true
  validates :uuid, :presence => true, :uniqueness => {:scope => :lst}                                                                                                                                                                    
end

如果我试试这个

f = Favorite.new
f.valid?

我收到以下错误消息:

NoMethodError: undefined method `zero?' for nil:NilClass
    from /Users/ragrawal/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.0/lib/active_record/associations/alias_tracker.rb:28:in `aliased_name_for'
    from /Users/ragrawal/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.0/lib/active_record/associations/join_dependency.rb:17:in `initialize'
    from /Users/ragrawal/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.0/lib/active_record/relation/finder_methods.rb:219:in `new'
    from /Users/ragrawal/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.0/lib/active_record/relation/finder_methods.rb:219:in `construct_join_dependency_for_association_find'
    from /Users/ragrawal/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.0/lib/active_record/relation/finder_methods.rb:192:in `exists?'
    from /Users/ragrawal/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.0/lib/active_record/validations/uniqueness.rb:32:in `validate_each'
    from /Users/ragrawal/.rvm/gems/ruby-1.9.2-p290/gems/activemodel-3.2.0/lib/active_model/validator.rb:153:in `block in validate'
    from /Users/ragrawal/.rvm/gems/ruby-1.9.2-p290/gems/activemodel-3.2.0/lib/active_model/validator.rb:150:in `each'
    from /Users/ragrawal/.rvm/gems/ruby-1.9.2-p290/gems/activemodel-3.2.0/lib/active_model/validator.rb:150:in `validate'
    from /Users/ragrawal/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.2.0/lib/active_support/callbacks.rb:310:in `_callback_before_15'
    from /Users/ragrawal/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.2.0/lib/active_support/callbacks.rb:429:in `_run__1275595979440079611__validate__42615372200132002__callbacks'
    from /Users/ragrawal/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.2.0/lib/active_support/callbacks.rb:405:in `__run_callback'
    from /Users/ragrawal/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.2.0/lib/active_support/callbacks.rb:385:in `_run_validate_callbacks'
    from /Users/ragrawal/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.2.0/lib/active_support/callbacks.rb:81:in `run_callbacks'
    from …

我想svn delete从我的Grails应用程序执行.我在Grails控制台中测试了以下两个方面:

"svn delete /usr/share/mydir".execute()

Runtime.getRuntime().exec("svn delete /usr/share/mydir")

在这两种情况下,java.lang.Process都返回一个实例,但该命令不会被执行(/usr/share/mydir不会被删除).

仅当应用程序在Linux(Ubuntu)上运行时才会发生此行为.如果我在Windows上运行它,命令就会执行.

更新

根据Tim在评论中的建议,我更改了命令,以便捕获进程输出:

def process = "svn delete /usr/share/mydir".execute()
def out = new StringBuilder()
process.waitForProcessOutput(out, new StringBuilder())

println "$out"

我现在看到它失败的原因是因为:

错误svn:无法打开文件'/usr/share/mydir/.svn/lock':权限被拒绝

我是铁轨上的红宝石的初学者.

我在官方网页上做了一切.(http://rubyonrails.org/download)

我尝试启动新项目,但localhost doest无法在ubuntu 12.04上运行.

我使用这些命令:

rails new /home/mehmet/Desktop/test/

这是控制台输出:

create  
  create  README.rdoc
  create  Rakefile
  create  config.ru
  create  .gitignore
  create  Gemfile
  create  app
  create  app/assets/images/rails.png
  create  app/assets/javascripts/application.js
  create  app/assets/stylesheets/application.css
  create  app/controllers/application_controller.rb
  create  app/helpers/application_helper.rb
  create  app/mailers
  create  app/models
  create  app/views/layouts/application.html.erb
  create  app/mailers/.gitkeep
  create  app/models/.gitkeep
  create  config
  create  config/routes.rb
  create  config/application.rb
  create  config/environment.rb
  create  config/environments
  create  config/environments/development.rb
  create  config/environments/production.rb
  create  config/environments/test.rb
  create  config/initializers
  create  config/initializers/backtrace_silencers.rb
  create  config/initializers/inflections.rb
  create  config/initializers/mime_types.rb
  create  config/initializers/secret_token.rb
  create  config/initializers/session_store.rb
  create  config/initializers/wrap_parameters.rb
  create  config/locales
  create  config/locales/en.yml
  create  config/boot.rb
  create …

到目前为止,我还没有找到任何有效的方法,可以通过使用acts_as_votablegem的upvotes订购问题.

这是我的upvote和索引方法:

 def upvote
  @question = Question.find params[:id]
  @question.liked_by current_user
  redirect_to comment_questions_path
 end

 def index
 @comment = Comment.find params[:comment_id]
 @questions = @comment.questions
 end

我的问题观点:

<%= div_for(question) do %>
<% if question.votes.size > 0 %>
<div class="verifiedanswer">
<%= question.body %>
</div>

<% else %>
<div class="answercontainer2">
<%= question.body %>
</div>
<% end %>

我应该在视图和控制器中放置什么才能使其工作？

我只是想知道:rails server春天不开始？似乎只有rake或rails console开始春天.这是正常的行为,还是我有错误的配置？

我有可更新的OHLCChart.我需要在图表上划一条线.

怎么实现呢？

在我的 grails 应用程序中，unicode 字符没有正确编码。

我正在使用 grails 1.3.7 和 tomcat 7.0.22。以下是我在我的应用程序中为 unicode 支持配置的设置：

- Set grails.views.gsp.encoding and grails.converters.encoding="UTF-8" in Config.groovy
- Set encoding to UTF-8 in meta tag in the .gsp pages
- Specified 'useUnicode=true&characterEncoding=UTF-8' to the MySql connection URL (DB has characterset set to UTF-8)
- Set URIEncoding="UTF-8" useBodyEncodingForURI="true" to the server.xml file in tomcat
- Specified the attribute accept-charset="UTF-8" of the form tag.

但是，当我提交一个 unicode 字符时，grails 不支持该字符并且正在保存乱码值。我已经用谷歌搜索并阅读了 ppl 在同一问题上寻求帮助，但不幸的是，这些解决方案对我不利。尽管如此，我已经找到了解决此问题的方法。下面的表达式

params.detail = params.detail ? new String(params.detail.getBytes("8859_1"), "UTF8") : null

将正确编码 …