danbarberphoto/app/controllers/admin/categories_controller.rb

module Admin
  class 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])

      if @category.update_attributes(permitted_params)
        redirect_to admin_categories_path, notice: 'Category was successfully updated.'
      else
        render :edit
      end
    end

    def create
      @category = Category.new(permitted_params)

      if @category.save
        redirect_to admin_categories_path, notice: 'Category was successfully added.'
      else
        render :edit
      end
    end

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

      redirect_to admin_categories_path, notice: 'Category was deleted.'
    end

    private

    def permitted_params
      params.require(:category).permit(:name, :slug, :description, :base_colour, :sort)
    end
  end
end