Finished Ingredient#create validations

app/models/ingredient.rb

@@ -5,11 +5,19 @@ class Ingredient < ActiveRecord::Base
 
   belongs_to :project
   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?
-  #}
+  accepts_nested_attributes_for :nutrients, allow_destroy: true, reject_if: proc { |attrs|
+    attrs['quantity_id'].blank? && attrs['amount'].blank?
+  }
+  validates_associated :nutrients
+  # Nutrient quantity_id uniqueness check for nested attributes
+  validate on: :create do
+    quantities = self.nutrients.map { |n| n.quantity_id }
+    if quantities.length != quantities.uniq.length
+      errors.add(:nutrients, :duplicated_quantity)
+    end
+  end
 
   validates :project, associated: true
   validates :name, presence: true, uniqueness: {scope: :project_id}

app/models/nutrient.rb

@@ -3,7 +3,8 @@ class Nutrient < ActiveRecord::Base
   belongs_to :quantity
   belongs_to :unit
 
-  validates :ingredient, presence: true, associated: true
+  # disabled to avoid loop with Ingredient 'validates_associated :nutrients'
+  #validates :ingredient, 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

app/views/ingredients/_form.html.erb

@@ -11,13 +11,13 @@
     <%= f.fields_for 'nutrients_attributes', n, index: '' do |ff| %>
       <p class="nutrient">
         <%= ff.select :quantity_id, quantity_options,
-          label: (index > 0 ? '' : :field_nutrients) %>
+          {include_blank: true, label: (index > 0 ? '' : :field_nutrients)} %>
         <%= ff.number_field :amount, {size: 8, min: 0, step: :any, label: ''} %>
-        <%= ff.select :unit_id, unit_options, label: '' %>
+        <%= ff.select :unit_id, unit_options, {label: ''} %>
         <%= ff.check_box :_destroy, {style: "display:none", label: ''} %>
         <%= link_to t(".button_delete_nutrient"), '#',
           :class => 'icon icon-del',
-          :style => "display:none",
+          :style => (@ingredient.nutrients.length > 1 ? "" : "display:none"),
           :onclick => "deleteNutrient(); return false;" %>
       </p>
     <% end %>
@@ -41,7 +41,8 @@
   function deleteNutrient() {
     var row = $(event.target).closest('p.nutrient');
     row.find('[id$=_destroy]').val(1);
-    row.hide();
+    // FIXME: should only hide()  row if record already saved (to send _destroy to backend)
+    row.remove();
     $('p.nutrient:visible:first label:first').text('<%= t "field_nutrients" %>');
     if ($('p.nutrient:visible').length <= 1) {
       $('p.nutrient a.icon-del').hide();

config/locales/en.yml

@@ -12,6 +12,10 @@ en:
   activerecord:
     errors:
       models:
+        ingredient:
+          attributes:
+            nutrients:
+              duplicated_quantity: 'you can define each quantity only once per ingredient'
         quantity:
           attributes:
             parent: