beast学习笔记——4,enviroment.rb

beast学习笔记——4,enviroment.rb

参考：

http://my.oschina.net/fireflyman/blog/4255

http://ryandaigle.com/articles/2008/4/1/what-s-new-in-edge-rails-gem-dependencies

 

总：每当你启动一个进程(例如Webrick服务器)处理Rails请求的时候,第一件发生的事情就是加载config/enviroment.rb

 

1,

(1)代码

# Be sure to restart your server when you modify this file

（2）表示

每次修改enviroment.rb，一定要重新你启动服务

 

2，

（1）代码

# Uncomment below to force Rails into production mode when
# you don't control web/app server and can't set it the proper way
# ENV['RAILS_ENV'] ||= 'production'

 

（2）表示

如果你将RAILS_ENV设置为生产模式,或者修改常量RAILS_ENV,它将使Rails程序中的一切运行于生产模式.
例如,test_helper.rb,我们可以看到它在加载环境配置之前是先把RAILS_ENV设置为测试模式的,因此它将不能正常工作. ENV["RAILS_ENV"] = "test"

require File.expand_path(File.dirname(__FILE__) + "/../config/environment")

require 'test_help'

但是，如果想把数据表也迁移到production中，需要使用命令：

rake db:migrate RAILS_ENV=product

3，

（1）代码

# Specifies gem version of Rails to use when vendor/rails is not present
RAILS_GEM_VERSION = '2.3.3' unless defined? RAILS_GEM_VERSION

（2）表示

该设置告诉environment.rb应该加载哪个版本的Rails.(备注:一旦脚本确认了加载哪个版本的Rails,它将加载对应的Rails　Gem.)

 

4

（1）代码

# Bootstrap the Rails environment, frameworks, and default configuration
require File.join(File.dirname(__FILE__), 'boot')

（2）表示

enviroment.rb之后的这一行,在加载config/boot.rb后,才真正启动了Rails，boot.rb启动脚本是Rails应用程序生成的一部分,但不能修改.它能够协助你检查Rails的安装是否有问题

 

5

Rails::Initializer.run do |config|
  # Settings in config/environments/* take precedence over those specified here.
  # Application configuration should go into files in config/initializers
  # -- all .rb files in that directory are automatically loaded.
  # See Rails::Configuration for more options.

 

#当应用被加载时，rails会自动在系统中（应该是C:\Ruby187\lib\ruby\gems\1.8\gems目录下）查找并require下面这些gem

#注意，config/environments/目录下的文件中的cofig.gem，优先级大于enviroment.rb中的

#如果你系统中没有，可以通过 rake gems:install来安装，或者通过gem install TheGemName一个个安装到系统中
#需要一个来自非标准站点的gem，lib名称为will_paginate（默认是mislav-will_paginate）
  config.gem 'mislav-will_paginate', :lib => "will_paginate",
    :source => "http://gems.github.com"

 

#需要最新版本的bluecloth
  config.gem "bluecloth"

  config.gem 'RedCloth', :lib => "redcloth",
    :source => "http://code.whytheluckystiff.net"

 

#跳过不想使用的Rails框架
  # Skip frameworks you're not going to use (only works if using vendor/rails).
  # To use Rails without a database, you must remove the Active Record framework
  # config.frameworks -= [ :active_record, :active_resource, :action_mailer ]

 

#指定加载的plugins及顺序，默认是全部plugins。plugins所在目录为/vendor/plugins
  # Only load the plugins named here, in the order given. By default, all plugins
  # in vendor/plugins are loaded in alphabetical order.
  # :all can be used as a placeholder for all plugins not explicitly named
  # config.plugins = [ :exception_notification, :ssl_requirement, :all ]

#添加另外的加载路径#备注:%W函数的作用是对参数逐字以空格分隔并组成数组,因为使用方便,所以在Rails代码中常被使用
  # Add additional load paths for your own custom dirs
  # config.load_paths += %W( #{RAILS_ROOT}/concerns )
#强制所有的环境使用同样的日志级别(缺省生产模式使用: info,其余的是: debug)
  # Force all environments to use the same logger level
  # (by default production uses :info, the others :debug)
  # config.log_level = :debug
#验证cookie中session数据正确性的密匙
  # Your secret key for verifying cookie session data integrity.
  # If you change this key, all old sessions will become invalid!
  # Make sure the secret is at least 30 characters and all random,
  # no regular words or you'll be exposed to dictionary attacks.
  config.action_controller.session = {
    :session_key => '_altered_beast_session',
    :secret      => 'f471415647be47dc513d5e345ca4e582a8f99f388e0ccd46a2cdac51e2cd27c8e8b4d7dbba379cf661d4857afaf6b1867489bbc5e16b5fb14d2c3e53df64c272'
  }
#使用数据库存储session，替代默认的客户端cookie存储
  # Use the database for sessions instead of the cookie-based default,
  # which shouldn't be used to store highly confidential information
  # (create the session table with 'rake db:sessions:create')
  # config.action_controller.session_store = :active_record_store
   #当创建测试数据库时,使用SQL代替Active Record,如果你的schema不能由Schema dumper完全备份时,这么做是必要的#例如,当你受限或拥有数据库特定列类型时
  # Use SQL instead of Active Record's schema dumper when creating the test database.
  # This is necessary if your schema can't be completely dumped by the schema dumper,
  # like if you have constraints or database-specific column types
  # config.active_record.schema_format = :sql
#激活需要一直运行的监听器
  # Activate observers that should always be running
  # config.active_record.observers = :cacher, :garbage_collector
 #使Active Record使用基于UTC对时区,而不是平地时间
  # Make Active Record use UTC-base instead of local time
  config.active_record.default_timezone = :utc
#指定rails框架使用的默认I18N语言，
  # The internationalization framework can be changed
  # to have another default locale (standard is :en) or more load paths.
  # All files from config/locales/*.rb,yml are added automatically.
  # config.i18n.load_path << Dir[File.join(RAILS_ROOT, 'my', 'locales', '*.{rb,yml}')]
  # config.i18n.default_locale = :en

end