1

我使用哈希值将设置存储在我的代码中。我想知道我是否可以为我的@profile 散列的类的所有实例提供类似类变量的东西。因此，下面的两个配置文件的通用配置文件变量都等于它们。我希望解决方案使用 hash。

@profile = {
  "vB4Discussions" => {    #profile name
     "urls"  => ["vB4 General Discussions"],
     "process?" => false,
     "type" => 'Discussion'
   },
  "vB4Design".downcase => {          #profile name      
     "urls"  => ["vB4 Design and Graphics Discussions"],
     "process?" => false,
      "type" => 'Design'
   }
}
4

2 回答 2

4

您是否知道当找不到密钥时，哈希可以调用一个特殊的过程？

这可以很好地用在这里。

require "backports"  # Needed in Ruby 1.8.6
SETTINGS = {
  "default" => {
    "urls"  => [],
    "process?" => false,
    "type" => 'Discussion'
  },
  "vB4Discussions" => {
    "urls"  => ["vB4 General Discussions"],
  },
  "vB4Design".downcase => {
    "urls"  => ["vB4 Design and Graphics Discussions"],
    "type" => 'Design'
  }
}

# Use defaults 
SETTINGS["vb4design"].default_proc = lambda{|h, k| SETTINGS["default"][k]}
SETTINGS["vB4Discussions"].default_proc = lambda{|h, k| SETTINGS["default"][k]}

# Now the defaults are used if needed:
SETTINGS["vB4Discussions"]["type"]  # ==> 'Discussion'
SETTINGS["vB4Discussions"]["process?"]  # ==> false

# Defaults can be edited later:
SETTINGS["default"]["process?"] = true
SETTINGS["vB4Discussions"]["process?"]  # ==> true
SETTINGS["vb4design"]["process?"]  # ==> true

# Specific value can be changed too
SETTINGS["vb4design"]["process?"] = false # ==> true
SETTINGS["vB4Discussions"]["process?"] # ==> true

注意：除非您有正当理由使用字符串，否则您应该使用符号作为键（即:vB4Discussions，而不是"vB4Discussions".

是 Ruby 1.8.7的Hash.default_proc=新功能，因此您需要require "backports"使用它。如果您不希望这样，您可以在创建哈希时指定默认 proc，如下所示：

DEFAULTS = {
  "urls"  => [],
  "process?" => false,
  "type" => 'Discussion'
}

SETTINGS = {
  "default" => DEFAULTS,
  "vB4Discussions" => Hash.new{|h, k| DEFAULTS[k]}.merge!{
    "urls"  => ["vB4 General Discussions"],
  },
  "vB4Design".downcase => Hash.new{|h, k| DEFAULTS[k]}.merge!{
    "urls"  => ["vB4 Design and Graphics Discussions"],
    "type" => 'Design'
  }
}
于 2010-01-27T14:36:33.050 回答
2

一种方法是对公共位使用常量，如下所示：

#!/usr/bin/ruby1.8

require 'pp'

COMMON_PROFILE = {
  "urls"  => ["vB4 General Discussions"],
  "process?" => false,
  "type" => 'Discussion'
}

@profile = {
  "vB4Discussions" => COMMON_PROFILE,
  "vB4Design".downcase => COMMON_PROFILE,
}

pp @profile

# => {"vB4Discussions"=>
# =>   {"vB4Discussions"=>
# =>     {"urls"=>["vB4 General Discussions"],
# =>      "process?"=>false,
# =>      "type"=>"Discussion"}},
# =>  "vb4design"=>
# =>   {"vB4Discussions"=>
# =>     {"urls"=>["vB4 General Discussions"],
# =>      "process?"=>false,
# =>      "type"=>"Discussion"}}}
于 2010-01-27T03:40:51.193 回答