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Rails中namespace的layout

Martian — Wed, 15 Apr 2009 02:57:00 GMT

在rails中提供了namespace的功能，但是如何实现namespace的layout呢？
假如�q�样一个场景：
routes.rb中这样定�?

map.namespace :admin do |admin|
admin.resources :articles
admin.resources :tags
end

需要对articles,tags提供一个统一的后台管理界面，�Ҏ��rails中的layout功能�Q�猜��x��否会有layouts/admin.html.erb�q�样一个针对namespace的模杉K��Q�但��试后发现根据不行，下面是google到的一个问题：

Do controllers in namespaces somehow get their own default layout
file?  For instance, the UsersController will use layouts/users.rhtml
if it exists.  Is there something similar for Admin::UsersController
or will it default to the same file?  I tried layouts/
admin_users.rhtml and layouts/admin/users.rhtml with no luck.

他也��试了同��L��问题�Q?span style="color: #000000;">layouts/users.rhtml, layouts/admin_users.rhtml, layouts/admin/users.rhtml�Q�都是no luck.

�q�里可以使用一个取巧的�Ҏ��Q�在controller中可以通过layout �Ҏ��来指定��用哪个模杉K��Q�这里可以写一个BaseController:

class Admin::BaseController < ApplicationController
layout 'admin'
end

在BaseController中指定模杉K��为admin.html.erb

然后��articles和tags的Controller都改为��承自BaseController�?

Martian 2009-04-15 10:57 发表评论

Rails中的namespace

Martian — Fri, 10 Apr 2009 08:56:00 GMT

在Rails中可以通过namespace来管理controller�?br /> 首先生成scaffold:
script/generate scaffold article title:string body:text
在routes.rb中添加如下�\由：

map.namespace :admin do |admin|
admin.resources :articles
end

由意味着�l�article增加了一个名为admin的namespace,��controllers中的articles_controller.rb修改为controllers/admin/articles_controller.rb�Q�也��是��这个控制器攑ֈ�admin�q�个文�g夹中�?br />
先看一下相应的路由规则,执行rake roures:

              admin_articles GET    /admin/articles                  {:action=>"index", :controller=>"admin/articles"}
    formatted_admin_articles GET    /admin/articles.:format          {:action=>"index", :controller=>"admin/articles"}
                             POST   /admin/articles                  {:action=>"create", :controller=>"admin/articles"}
                             POST   /admin/articles.:format          {:action=>"create", :controller=>"admin/articles"}
           new_admin_article GET    /admin/articles/new              {:action=>"new", :controller=>"admin/articles"}
formatted_new_admin_article GET    /admin/articles/new.:format      {:action=>"new", :controller=>"admin/articles"}
          edit_admin_article GET    /admin/articles/:id/edit         {:action=>"edit", :controller=>"admin/articles"}
formatted_edit_admin_article GET    /admin/articles/:id/edit.:format {:action=>"edit", :controller=>"admin/articles"}
               admin_article GET    /admin/articles/:id              {:action=>"show", :controller=>"admin/articles"}
     formatted_admin_article GET    /admin/articles/:id.:format      {:action=>"show", :controller=>"admin/articles"}
                             PUT    /admin/articles/:id              {:action=>"update", :controller=>"admin/articles"}
                             PUT    /admin/articles/:id.:format      {:action=>"update", :controller=>"admin/articles"}
                             DELETE /admin/articles/:id              {:action=>"destroy", :controller=>"admin/articles"}

                             DELETE /admin/articles/:id.:format      {:action=>"destroy", :controller=>"admin/articles"}

                                    /:controller/:action/:id
                                    /:controller/:action/:id.:format

�Ҏ��一下不加admin�q�个namespace时的路由�Q?br />

          article_index GET    /article                         {:action=>"index", :controller=>"article"}
formatted_article_index GET    /article.:format                 {:action=>"index", :controller=>"article"}
                        POST   /article                         {:action=>"create", :controller=>"article"}
                        POST   /article.:format                 {:action=>"create", :controller=>"article"}
            new_article GET    /article/new                     {:action=>"new", :controller=>"article"}
  formatted_new_article GET    /article/new.:format             {:action=>"new", :controller=>"article"}
           edit_article GET    /article/:id/edit                {:action=>"edit", :controller=>"article"}
formatted_edit_article GET    /article/:id/edit.:format        {:action=>"edit", :controller=>"article"}
                article GET    /article/:id                     {:action=>"show", :controller=>"article"}
      formatted_article GET    /article/:id.:format             {:action=>"show", :controller=>"article"}
                        PUT    /article/:id                     {:action=>"update", :controller=>"article"}
                        PUT    /article/:id.:format             {:action=>"update", :controller=>"article"}
                        DELETE /article/:id                     {:action=>"destroy", :controller=>"article"}
                        DELETE /article/:id.:format             {:action=>"destroy", :controller=>"article"}
                               /:controller/:action/:id
                               /:controller/:action/:id.:format

所有的路由规则上面�Q�都加上了admin�q�个namespace�?br />
下面��p��views目录下面的articles目录改到views/admin目录下面�Q�因为根据�\��p��则，会到views/admin/articles/目录下面��L��扄��应的模板�?br />
另外�Q�还需要将原来的new_article_url | new_article_path�{�helper�Ҏ��修改为new_admin_article_url | new_admin_article_path�Q�将�q�些helper�Ҏ��全部加上admin�q�个namespace�?br />

Martian 2009-04-10 16:56 发表评论

[转]Why I like Ruby #1: alias_method

Martian — Fri, 03 Apr 2009 08:18:00 GMT

So you found yourself in the need to override a method but still count on it’s old behaviour?

No problem! Override it with your new code, call super and…. Uh oh!! Suddenly this turned into a problem… Let me give some more context.

I was testing Ferret (and the acts_as_ferret plugin) in a project to provide full text search capabilities to our models. One of the things the plugin does is to add a new method to ActiveRecord, called find_with_ferret. That way, every model can use it. Great!

So I thought that would make sense for me to remove all diatrictics from the input text before letting ferret do its job. You know, like removing umlauts and all that.

I could do that by overriding this method with code to remove the undesired chars and then call its older version to finally do the search - something like calling super, but not quite. And I didn’t want my models to inherit from anything else than ActiveRecord::Base. That wouldn’t make any sense.

alias_method to the rescue!

You know that to redefine a method in an existing class you can open it up and rewrite it. But since you don’t wanna loose the behaviour provided by the original method, this is how you can achieve this:

module ActiveRecord
  class Base
    alias_method :find_with_ferret_original, :find_with_ferret

    def find_with_ferret(q, options = {}, find_options = {})
      remove_diatrictics!(q)
      find_with_ferret_original(q, options, find_options)
    end
  end
end

And you’re good to go. On line 3 you’re just giving the original method an alias, making a copy of it.

Then you redefine it the way you like and on line 6 you call the old version to make sure u still got the same behaviour.
Now all my models can benefit of this change without requiring them to call another method nor inherit from another class.

Cool, huh?

Martian 2009-04-03 16:18 发表评论

Martian — Fri, 03 Apr 2009 01:32:00 GMT

修改文�g上传目录
easy_fckeditor默认的文件上传目录�ؓ
public/uploads/Image�Q�全部上传的囄��都会被上传的该目录下�Q��ؓ了方便管理，��上传的囄��Ҏ��上传日期上传��C��同的日期目录下：
需要修改几个方法：

def current_directory_path
    base_dir = "#{UPLOADED_ROOT}/#{params[:Type]}/#{ Time.now.strftime('%Y%m%d') }"
#    Dir.mkdir(base_dir, 0775) unless File.exists?(base_dir)
    FileUtils.mkdir_p base_dir
    check_path("#{base_dir}#{params[:CurrentFolder]}")
    "#{base_dir}"
end

def upload_directory_path
    #    uploaded = request.relative_url_root.to_s + "#{UPLOAD_FOLDER}/#{params[:Type]}"
    uploaded = ActionController::Base.relative_url_root.to_s+"#{UPLOADED}/#{params[:Type]}" + "/"  + Time.now.strftime('%Y%m%d')
    "#{uploaded}#{params[:CurrentFolder]}"
end

主要是加个日�?span style="color: #000000;">Time.now.strftime('%Y%m%d'),��上传后的图片上传到public/uploads/Image/20090403/目录下，如果要换另一�U��Ş式，也很方便 �Q�将Time.now.strftime('%Y%m%d')�Ҏ��自己需要的��可以了�?/span>

Martian 2009-04-03 09:32 发表评论

Rails Plugin: Easy Fckeditor

Martian — Thu, 02 Apr 2009 14:57:00 GMT

#安装easy fckeditor插�g�Q�需要首先安装git
ruby script/plugin install git://github.com/gramos/easy-fckeditor.git

#使用rake安装fckeditor
rake fckeditor:install

** Installing FCKEditor Plugin version 0.8.1
Creating directory editor
Creating directory css
Creating directory behaviors
  Installing file disablehandles.htc
  Installing file showtableborders.htc
  Installing file fck_editorarea.css
  Installing file fck_internal.css
  Installing file fck_showtableborders_gecko.css
Creating directory images
  Installing file block_address.png
  Installing file block_blockquote.png
  Installing file block_div.png
.
.
.
  Installing file fckplugin.js
  Installing file _upgrade.html
  Installing file _whatsnew.html
  Installing file _whatsnew_history.html
** Successfully installed FCKEditor Plugin version 0.8.1

#在需要��用Fckeditor的页面引入fckeditor.js文�g

<%= javascript_include_tag :fckeditor %>

#使用fckeditor_textarea

<%= fckeditor_textarea :article, :body, {:toolbarSet => 'Easy', :width => '100%', :height => '300px'} %>

#更详�l�的使用说明�Q�可以参看http://github.com/gramos/easy-fckeditor/tree/master

解决上传囄��问题

1. 在上传图片的时�?rails2.2.2)�Q�会出现如下的错误：

NoMethodError (undefined method `relative_url_root' for #):

解决�Ҏ��参�?http://github.com/salicio/fckeditor/commit/fcf8fbee8cfad3a3df0df50172e448727909ccb9
1. ��?vendor/plugins/easy_fckeditor/app/controllers/fckeditor_controller.rb中的
uploaded = request.relative_url_root.to_s+"#{UPLOADED}/#{params[:Type]}"
修改�?
uploaded = ActionController::Base.relative_url_root.to_s+"#{UPLOADED}/#{params[:Type]}"
2. ��?vendor/plugins/easy_fckeditor/lib/fckeditor.rb中的
js_path = "#{controller.relative_url_root}/javascripts"
修改为：
js_path = "#{ActionController::Base.relative_url_root}/javascripts"

2. 该plugins版本��定义了一个变量：
会出现如下错误：

NameError (uninitialized constant FckeditorController::UPLOADED):

修改很简单，只要修改
/vendor/plugins/easy_fckeditor/app/controllers/fckeditor_controller.rb,增加:
UPLOADED = "/uploads"

完成之后�Q�能够正�怸�传图片，�q��览�?br />

Martian 2009-04-02 22:57 发表评论

install ruby on rails, sqlite3, sqlite3-ruby under ubuntu8.10

Martian — Wed, 01 Apr 2009 06:57:00 GMT

nothing but the script I used:

#install Ruby and relative
apt-get install ruby

#install wget
sudo apt-get install wget

#install rubygems
wget http://rubyforge.org/frs/download.php/45905/rubygems-1.3.1.tgz
tar xzf rubygems-1.3.1.tgz
cd rubygems-1.3.1
sudo ruby setup.rb
gem -v
1.3.1

# or update rubygems
sudo gem install rubygems-update -v 1.3.1

#install Rails and dependencies
gem install rails –include-dependencies -v=2.2.2

#install Sqlite3

apt-get install sqlite3 swig libsqlite3-ruby libsqlite3-dev

apt-get install ruby1.8-dev libsqlite3-dev (required)

gem install sqlite3-ruby #compile this need libsqlite.h

Martian 2009-04-01 14:57 发表评论

ActiveRecord�U�联删除

Martian — Mon, 30 Mar 2009 13:00:00 GMT

Rails在关联关�p�M��Q�han_one和has_many都有一�?dependent选项�Q�告诉ActiveRecord在删除父记录时该如何处理子记录，它有五个属�?AWDWR)�Q?br />

:dependent => :destroy(或true) --- 删除父记录的同时删除子表中的记录
:dependent => :nullify --- 删除父记录之后保留子记录�Q�同时将子记录的外键��D��|��ؓnull
:dependent => :false(或nil) --- 删除父记录时不改变子记录�?

但是在��用的�q�程中，讄��?destroy�?nullify�Q�都没有辑ֈ�效果�Q�由于��用的是rails2.2.2�Q�看了一下has_many的源码：

      # [:dependent]
      #   If set to :destroy all the associated objects are destroyed
      #   alongside this object by calling their +destroy+ method.  If set to :delete_all all associated
      #   objects are deleted *without* calling their +destroy+ method.  If set to :nullify all associated
      #   objects' foreign keys are set to +NULL+ *without* calling their +save+ callbacks. *Warning:* This option is ignored when also using
      #   the :through option.

发现选项已经变成了：

:destroy
:delete_all
:nullify

但发��C��没有辑ֈ�要求�?br />
最后发现controller代码中调用的是ActiveRecord的delete�Ҏ��Q�换成destroy�Ҏ��后，发现能够正常地��联删除子记录�?br /> 对于ActiveRecord�Q�delete�Ҏ��不能�U�联删除子记录，而要使用destroy�Ҏ�� ?br />

Martian 2009-03-30 21:00 发表评论

Martian — Sun, 29 Mar 2009 10:36:00 GMT

今天把MySQL换成�?.1版本的，使用rake db:create的时候，出现了一个error�Q�但是能够正常地在数据库中创建database�Q�但使用rake db:migrate的时候，��报错说无法使用"show tables"�q�个命��o�Q�但表还是正常的生成了。可在��用过�E�中�Q�只要涉及到写数据库的操作，都会异常退出server�Q�把MySQL换成5.0版本的，问题��p��决了�Q�估计是驱动问题�?br />

Martian 2009-03-29 18:36 发表评论