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Sharing variable's data across controller method via before/after filters or the session hash. Which way is better if filters allow this?

The short answer is yes. Pretty popular for loading models. For example:

class UsersController < ApplicationController
  before_filter :load_user

  def show


  def load_user
    @user = User.find(params[:id])

@user is now set and accessible in your view. You can ripple that across other methods or use 'only' or 'except' to filter which of them they apply to.

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