parsley/app/models/recipe.rb

class Recipe < ActiveRecord::Base

  has_many :recipe_ingredients, -> { order :sort_order }, inverse_of: :recipe, dependent: :destroy
  has_many :recipe_steps, -> { order :sort_order }, inverse_of: :recipe, dependent: :destroy
  belongs_to :user

  scope :active, -> { where('deleted <> ? OR deleted IS NULL', true) }

  accepts_nested_attributes_for :recipe_ingredients, allow_destroy: true
  accepts_nested_attributes_for :recipe_steps, allow_destroy: true

  validates :name, presence: true
  validates :total_time, numericality: true, allow_blank: true
  validates :active_time, numericality: true, allow_blank: true

  NAME_CUTOFF = 35

  def display_name
    if self.name.length >= NAME_CUTOFF
      self.name[0...NAME_CUTOFF] + '...'
    else
      self.name
    end
  end

  def scale(factor, auto_unit = false)
    recipe_ingredients.each do |ri|
      ri.scale(factor, auto_unit)
    end
  end

  def convert_to_metric
    recipe_ingredients.each do |ri|
      ri.to_metric
    end
  end

  def convert_to_standard
    recipe_ingredients.each do |ri|
      ri.to_standard
    end
  end

  def convert_to_mass
    recipe_ingredients.each do |ri|
      ri.to_mass
    end
  end

  def convert_to_volume
    recipe_ingredients.each do |ri|
      ri.to_volume
    end
  end

  def nutrition_data(recalculate = false)
    if recalculate || @nutrition_data.nil?
      @nutrition_data = calculate_nutrition_data
    end
    @nutrition_data
  end

  def parsed_yield
    if @parsed_yield.nil? && self.yields.present?
      @parsed_yield = YieldParser.parse(self.yields)
    end
    @parsed_yield
  end

  private

  def calculate_nutrition_data
    NutritionData.new(recipe_ingredients)
  end
end