gistfile1.rb

class BooksController < ApplicationController
  def create
    @book = Book.new(params[:book], as : user_role)
    respond_to do |format|
      if @book.save
        format.html { redirect_to @book notice 'Book was successfully created.' }
      else
        format.html { render action : "new" }
      end
    end
  end

  def update
    @book = Book.find(params[:id])
    respond_to do |format|
      if @book.update_attributes(params[:book], as :
        user_role)
        format.html { redirect_to @book, notice : 'Book was successfully updated.' }
      else
        format.html { render action : "edit" }
      end
    end
  end

  private
  def user_role
    current_user.try(:admin) ? :admin : (current_user.try(:user) ? :user : :reporting_user)
  end
end