Added nested nutrients in ingredient form

app/models/ingredient.rb

@@ -4,6 +4,8 @@ class Ingredient < ActiveRecord::Base
   }
 
   belongs_to :project
+  has_many :nutrients
+  accepts_nested_attributes_for :nutrients
 
   validates :project, associated: true
   validates :name, presence: true, uniqueness: {scope: :project_id}

app/models/nutrient.rb

@@ -1,2 +1,8 @@
 class Nutrient < ActiveRecord::Base
+  belongs_to :ingredient
+
+  validates :ingredient, presence: true, associated: true
+  validates :quantity, presence: true, associated: true
+  validates :amount, numericality: {greater_than: 0}
+  validates :unit, presence: true, associated: true
 end