Started Ingredient#create

app/models/ingredient.rb

@@ -4,8 +4,12 @@ class Ingredient < ActiveRecord::Base
   }
 
   belongs_to :project
-  has_many :nutrients
+  belongs_to :ref_unit, class_name: 'Unit'
+  has_many :nutrients, inverse_of: :ingredient
   accepts_nested_attributes_for :nutrients, allow_destroy: true
+  #reject_if: proc { |attrs|
+  #  attrs['quantity_id'].blank? && attrs['amount'].blank?
+  #}
 
   validates :project, associated: true
   validates :name, presence: true, uniqueness: {scope: :project_id}

app/models/nutrient.rb

@@ -1,8 +1,10 @@
 class Nutrient < ActiveRecord::Base
-  belongs_to :ingredient
+  belongs_to :ingredient, inverse_of: :nutrients
+  belongs_to :quantity
+  belongs_to :unit
 
   validates :ingredient, presence: true, associated: true
-  validates :quantity, presence: true, associated: true
+  validates :quantity, presence: true, associated: true, uniqueness: {scope: :ingredient_id}
   validates :amount, numericality: {greater_than: 0}
   validates :unit, presence: true, associated: true
 end