忘记密码：发生此错误＆＃34;电子邮件不能为空白＆＃34;

Question

我在forget password.上遇到此错误如何修复它。我想定制它。我需要通过email以及username重置密码。 我的模型如下

class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  belongs_to :role
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :confirmable, :lockable, :validatable, :authentication_keys => [:login]
  # validates_uniqueness_of :username
  # validates_presence_of   :username

  after_create :create_profile



  attr_accessor :login

  def create_profile
    if self.role.name == "student"
        Student.create :user_id => self.id
      elsif self.role.name == "company"
        Company.create :user_id => self.id
      else
        University.create :user_id => self.id  
    end    
  end

  def self.find_for_database_authentication(warden_conditions)
    conditions = warden_conditions.dup
    if login = conditions.delete(:login)
      where(conditions).where(["lower(username) = :value OR lower(email) = :value", { :value => login.downcase }]).first
    else
      where(conditions).first
    end
  end

end