Added nested nutrients in ingredient form

app/controllers/ingredients_controller.rb

@@ -4,6 +4,7 @@ class IngredientsController < ApplicationController
 
   def index
     @ingredient = Ingredient.new
+    @nutrient = Nutrient.new
     @ingredients = @project.ingredients
   end
 

app/helpers/ingredients_helper.rb

@@ -1,4 +1,10 @@
 module IngredientsHelper
+  def quantity_options
+    nested_set_options(@project.quantities.diet) do |q|
+      raw("#{' ' * q.level}#{q.name}")
+    end
+  end
+
   def unit_options
     @project.units.map do |u|
       [u.shortname, u.id]

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

app/views/ingredients/_form.html.erb

@@ -7,4 +7,11 @@
   <%= f.select :ref_unit_id, unit_options, {label: '', required: true} %>
   </p>
   <p><%= f.select :group, group_options, required: true %></p>
+  <%= f.fields_for :nutrients, @nutrient do |ff| %>
+    <p>
+    <%= ff.select :quantity_id, quantity_options, {label: '', required: true} %>
+    <%= ff.number_field :amount, {size: 8, label: '', required: true} %>
+    <%= ff.select :unit_id, unit_options, {label: '', required: true} %>
+    </p>
+  <% end %>
 </div>