param is missing or the value is empty nested require permit

Error: param is missing or the value is empty: home_address_attributes

Before (wrong)

 private
 def user_params
   Rails.logger.info("PARAMS: #{params.inspect}")
   params.require(:user).permit(:fullname, :login, :password, :password_confirmation, :phone_home, :phone_work, :phone_cell, :deliveryNote, :home_address_attributes).require(:home_address_attributes)
 end

After (good)

  private
  def user_params
    Rails.logger.info("PARAMS: #{params.inspect}")
    params.require(:user).permit(:fullname, :login, :password, :password_confirmation, :phone_home, :phone_work, :phone_cell, :deliveryNote, 
      { home_address_attributes: [ :line1, :line2, :country, :zipCode, :province, :city ] })
  end

The documentation is there http://api.rubyonrails.org/classes/ActionController/Parameters.html#method-i-require