在Rails中放置常量的位置

时间:2010-04-29 08:15:14

标签: ruby-on-rails

我有一些常量,这些数组是我不想创建数据库记录但我不知道在哪里存储常量而不会出错。

例如

CONTAINER_SIZES = [["20 foot"],["40 foot"]]

我可以在哪里存储,以便所有模型和控制器都可以访问它?

2 个答案:

答案 0 :(得分:2)

我把它们直接放在模型类中。

class User < ActiveRecord::Base
USER_STATUS_ACTIVE = "ACT"
USER_TYPES = ["MANAGER","DEVELOPER"]
end

答案 1 :(得分:2)

我会写信给你。

class User < ActiveRecord::Base   
  STATES = {
    :active => {:id => 100, :name => "active", :label => "Active User"},
    :passive => {:id => 110, :name => "passive", :label => "Passive User"},
    :deleted => {:id => 120, :name => "deleted", :label => "Deleted User"}
  }

  # and methods for calling states of user

  def self.find_state(value)
    if value.class == Fixnum
      Post::STATES.collect { |key, state|
        return state if state.inspect.index(value.to_s)
      }
    elsif value.class == Symbol
      Post::STATES[value]
    end
  end
end

所以我可以称之为

User.find_state(:active)[:id]

User.find_state(@user.state_id)[:label]

此外,如果我想将所有状态加载到选择框,如果我不想要其中的某些状态(如删除状态)

def self.states(arg = nil)
  states = Post::STATES
  states.delete(:deleted)
  states.collect { |key, state|
    if arg.nil?
      state
    else
      state[arg]
    end
  }
end

我现在可以像

一样使用它
select_tag 'state_id', User.states.collect { |s| [s[:label], s[:id]] }