class EmergencyContact < ActiveRecord::Base
  attr_accessible :full_name, :relationship, :mobile_phone, :student_id
  belongs_to :student

  validates :full_name, :presence => true
  validates :relationship, :presence => true

end

Student Name: _____________

Emergency Contacts
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| Name         | Relationship             |
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|              |                          |
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|              |                          |
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|              |                          |
------------------------------------------

class Student < ActiveRecord::Base
  has_many                      :emergency_contacts
  accepts_nested_attributes_for :emergency_contacts,
                                :reject_if => lambda { |a| a[:full_name].blank? }
end

proc { |attributes|
    attributes.delete :_destroy
    attributes.reject { |key, value| value.blank? }.empty?
}

accepts_nested_attributes_for :emergency_contacts, :reject_if => :all_blank