danbarberphoto/app/controllers/admin/categories_controller.rb

class Admin::CategoriesController < Admin::AdminController

  def index
    @categories = Category.all
  end

  def new
    @category = Category.new
  end

  def edit
    @category = Category.find(params[:id])
  end

  def update
    @category = Category.find(params[:id])

    respond_to do |format|
      if @category.update_attributes(params[:category])
        format.html { redirect_to(admin_categories_path, :notice => 'Category was successfully updated.') }
        format.xml  { head :ok }
      else
        format.html { render :action => "edit" }
        format.xml  { render :xml => @category.errors, :status => :unprocessable_entity }
      end
    end
  end

  def create
    @category = Category.new(params[:category])

    respond_to do |format|
      if @category.save
        format.html { redirect_to(admin_categories_path, :notice => 'Category was successfully added.') }
        format.xml  { head :ok }
      else
        format.html { render :action => "edit" }
        format.xml  { render :xml => @category.errors, :status => :unprocessable_entity }
      end
    end
  end

  def destroy
    @category = Category.find(params[:id])
    @category.destroy

    respond_to do |format|
      format.html { redirect_to(admin_categories_path, :notice => 'Category was deleted.') }
      format.xml  { head :ok }
    end
  end

end