How to validate in a model, data from a controller

Question

So I have some data that gets pulled from another rails app in a controller lets call it ExampleController and I want to validate it as being there in my model before allowi

Answer 1

So I tried to edit and add to the @charlysisto question as this was closest to the answer but it did not work so here is the solution I used, as suggested the answer was to send the data from the controller to the model (Although the answers left out using the view to call the controller method) here is my solution

Model - models/awizard.rb

class Awizard
  include ActiveModel::Validations

  cattr_accessor :valid_data

  validate :data_validation :if => lambda { |o| o.current_step == "step1" }

  def data_validation
    if self.valid_data == false || self.valid_data.blank?
      errors.add(:valid_data, "not found")
    end
  end

  #Other wizard stuff

end

View - awizard/_step1.html.erb

  <% f.label "valid data? %>
  <% @_controller.valid_data %> #Call controller method to send data to model

Controller

class AwizardController < ApplicationController

  def valid_data
    data = #data from elsewhere
    if !data.blank?
      Awizard.valid_data = true
    else
      Awizard.valid_data = false
  end

end