Changed Unit.type -> .group

Added Unit validations. Added default Units.

app/helpers/units_helper.rb

@@ -1,6 +1,6 @@
 module UnitsHelper
-  def type_options
-    translations = t('.types')
-    Unit.types.map { |k,v| [translations[k.to_sym], k] }
+  def group_options
+    translations = t('.groups')
+    Unit.groups.map { |k,v| [translations[k.to_sym], k] }
   end
 end

app/models/unit.rb

@@ -1,6 +1,8 @@
 class Unit < ActiveRecord::Base
+  belongs_to :project
+
   # https://en.wikipedia.org/wiki/International_System_of_Units
-  enum type: {
+  enum group: {
     number: 0,
     share: 1,
 
@@ -21,4 +23,8 @@ class Unit < ActiveRecord::Base
 
     pressure: 40
   }
+
+  validates :project, associated: true
+  validates :name, :shortname, presence: true
+  validates :group, inclusion: groups.keys
 end

app/views/units/_form.html.erb

@@ -6,7 +6,7 @@
       <p><%= f.text_field :shortname, required: true, size: 10 %></p>
     </div>
     <div class="splitcontentright">
-      <p><%= f.select :type, type_options, required: true %></p>
+      <p><%= f.select :group, group_options, required: true %></p>
     </div>
   </div>
   <p><%= f.text_field :name, required: true, size: 40 %></p>