##sub model, position

class Position < ActiveRecord::Base
  belongs_to :account
  has_many :users
  has_many :position_auto_enrollments

  validates_uniqueness_of :name, :scope => :account_id

  def name
    self[:name].capitalize
  end
end

##snippet from the view that contains multiple models, @user is the super model of the form that contains the submodel position

        <tr>
                <th><label for="position_name">Position</label></th>
                <% fields_for "user[position]", @user.position do |position| %>
                  <td><%= position.text_field 'name' %>&nbsp;&nbsp;</td>
                <% end %>
        </tr>