how to pass session variable to model in RoR?

Question

I used a global variable in my app for passing information before. But I got a problem and thanks everyone here suggested me to store those data in session with database.

Answer 1

If I understand you correctly, a session variable changes the way you validate the model. I believe the correct solution for this is the following:

class Blog < ActiveRecord::Base
  attr_accessor :validate_title

  validate_presence_of :title, :if => :validate_title
end

class BlogsController < ApplicationController
  def new
    @blog = Blog.new
    @blog.validate_title = session[:validate_title]
  end
end

The code has not been testet, but that's the idea. The if argument can be the name of a method and you can do whatever you want in there. You can have various validation modes if you want. For example:

class Blog < ActiveRecord::Base
  attr_accessor :validation_mode

  validate_presence_of :title, :if => :validate_title

  def validate_title
    validation_mode == "full" or validation_mode == "only_title"
  end
end

class BlogsController < ApplicationController
  def new
    @blog = Blog.new
    @blog.validate_mode = session[:validate_mode]
  end
end

For more information, read the guide on validation.