在rails中放置常量的位置

我会给你写信的。

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]

或

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

另外,如果我想将所有状态加载到一个选择框中,如果我不想在其中包含某些状态(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

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

我把它们直接放在模型课上。

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