gistfile1.txt

# app/controllers/books/base_controller.rb
class BooksController < ApplicationController
  respond_to    :html
  before_filter :find_resource, :only => [:show, :edit, :update, :destroy]

  def index
    @books = context.page params[:page]
  end

  def show
  end

  def new
    @book = context.new
  end

  def edit
  end

  def create
    @book = context.new(params[:book])

    # Save the last donor to speed up the process
    session[:donor_id] = @book.donor_id

    ## Should be handled by Book class
    # unless @book.isbn.blank?
    #   @book.attributes = OCLC.find_by_isbn(@book.isbn)
    #   @book.attributes = AMZN.find_by_isbn(@book.isbn)
    # end

    if @book.save
      flash[:notice] = 'You successfully added a book.'
      redirect_to :action => 'show', :id => @book.id
    else
      render :new
    end
  end

  def update
    if @book.update_attributes(params[:book])
      flash[:notice] = case @book.recommendation
        when 'keep'
          "The book's recommendation has been updated to: keep."
        when 'toss'
          "The book's recommendation has been updated to: toss."
        when 'undecided'
          "The book's recommendation has been updated to: undecided."
        else
          "You successfully updated the book."
      end

      redirect_to :action => 'show', :id => @book.id
    else
      render :edit
    end
  end

  def destroy
    if @book.destroy
      flash[:notice] = 'You successfully deleted the book.'
      redirect_to :action => 'index'
    else
      flash[:error] = 'There was a problem removing the book. Please try again.'
      redirect_to :action => 'index'
    end
  end

  protected
    def find_resource
      @book = context.find(params[:id])
    end

    def current_context
      if params[:bin_id]
        Bin.find(params[:bin_id]).books
      elsif params[:donor_id]
        Donor.find(params[:donor_id]).books
      else
        Book
      end
    end

    def context
      @_context ||= current_scope ? current_context.send(current_scope) : current_context
    end

    def current_scope
      Book.scopes.keys.include?(params[:scope].try(:to_sym)) ? params[:scope] : nil
    end
end