parsley/app/controllers/ingredients_controller.rb

class IngredientsController < ApplicationController

  def search
    @ingredients = Food.search(params[:query]).order(:name).to_a
    @ingredients.concat(Recipe.is_ingredient.search_by_name(params[:query]).order(:name).to_a)
    @ingredients.sort { |a, b| a.name <=> b.name }
  end

end