parsley/app/models/task_list.rb

class TaskList < ApplicationRecord

  belongs_to :user
  has_many :task_items, dependent: :delete_all

  validates :name,
            presence: true,
            uniqueness: { case_sensitive: false }

  scope :for_user, -> (user) { where(user_id: user) }

  def add_recipe_ingredients(recipe, recurse_depth = 0)
    if recurse_depth > 10
      raise "This shouldn't be. Did you make a recipe loop?"
    end

    recipe.recipe_ingredients.each do |ri|
      if ri.ingredient.is_a?(Recipe)
        add_recipe_ingredients(ri.ingredient, recurse_depth + 1)
      else
        item = self.task_items.detect { |i| i.name.downcase == ri.name.downcase } || task_items.build(name: ri.name)
        quantity_str = [ri.quantity, ri.units].delete_if { |i| i.blank? }.join(' ')
        if item.quantity.blank?
          item.quantity = quantity_str
        else
          item.quantity += (', ' + quantity_str)
        end

        item.save
      end
    end
  end

end