ruby-on-rails – 如何在模型中验证来自控制器的数据

所以我有一些数据从控制器中的另一个rails应用程序中拉出来让我们称之为ExampleController,我想在我的模型中验证它,然后才允许向导进入下一步,我无法弄清楚如何我应该这样做(我知道直接从控制器获取这些数据到模型中违反了MVC我正在寻找从控制器获取数据的最佳解决方法).数据必须来自控制器,因为获取它的方法包含在ApplicationController中,但如果这更容易,我可以在Awizard控制器中执行此操作. (我也不能用宝石)

请提供一些问题的建议,而不是解释为什么这不是正确的做事方式我已经意识到已经但不能以另一种方式做到.

示例控制器

这应该代替渲染数据,然后检查它在其他地方是不是空白？

class ExampleController < ApplicationController

  def valid_data?            
    data = #data could be nil or not
    if data.blank?
      return false
    else
      return true
  end

end

我的模型 – (models / awizard.rb)

我如何使用valid_data？来自示例控制器的方法？在我的验证中.

class AWizard
include ActiveModel::Validations
include ActiveModel::Conversion
include ActiveModel::Dirty
include ActiveModel::Naming

#This class is used to manage the wizard steps using ActiveModel (not ActiveRecord)

attr_accessor :id
attr_writer :current_step  #used to write to current step
define_attribute_methods [:current_step] #used for marking change

validate :first_step_data,:if => lambda { |o| o.current_step == "step1" };

def first_step_data
  #What should i put here to check the valid_data? from the examplecontroller
end

def initialize(attributes = {})
   attributes.each do |name,value|
     send("#{name}=",value)
   end
end

def current_step
  @current_step || steps.first
end

def steps
  %w[step1 step2 step3] #make list of steps (partials)
end

def next_step
  current_step_will_change! #mark changed when moving stepped
  self.current_step = steps[steps.index(current_step)+1] unless last_step?
end

def previous_step
  current_step_will_change! #mark changed when moving stepped
  self.current_step = steps[steps.index(current_step)-1] unless first_step?
end

def first_step?
  current_step == steps.first
end

def last_step?
  current_step == steps.last
end

def all_valid?
  steps.all? do |step|
    self.current_step = step
    valid?
  end
end

def step(val)
  current_step_will_change!
  self.current_step = steps[val]
end

def persisted?
  self.id == 1
end

end

或者我需要将此添加到此视图中吗？

(/views/awizard/_step1.html.erb)

<div class="field">
  <%= f.label 'Step1' %><br />
  #This is the step I want to validate
</div>

class ExampleController < ApplicationController

  def valid_data?            
    data = #data could be nil or not
    result = data.blank?
    Awizard.valid_data= result
    result
  end

end

class Wizard
  cattr_accessor :valid_data


  def valid_data?
    self.class.valid_data
  end
end

:full_moon => true

# in example_controller.rb
before_filter :set_wizard_data,:only => [:create,:update]
....
def set_wizard_data
  @wizard = Wizard.find params[:id]
  @wizard.valid_data= valid_data
end