问使用用户名创建帐户

EN

<h3>Sign up</h3>

<%= form_for(resource, :as => resource_name, :url => registration_path(resource_name)) do |f| %>
  <%= devise_error_messages! %>
  <div><%= f.label :firstname, "First Name", :autofocus => true %><br />
  <script type="text/javascript">window.onload = function() {document.getElementById('user_firstname').focus();}</script>
  <%= f.text_field :firstname %></div>

  <div><%= f.label :lastname, "Last Name", :autofocus => true %><br />
  <%= f.text_field :lastname %></div>

  <div><%= f.label :password %><br />
  <%= f.password_field :password %></div>

  <div><%= f.label :password_confirmation %><br />
  <%= f.password_field :password_confirmation %></div>

  <div><%= f.submit "Sign up" %></div>
<% end %>

<%= render :partial => "devise/shared/links" %>

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

  # Setup accessible (or protected) attributes for your model
  #attr_accessor :username
  validates_presence_of :firstname, :lastname, :unique => true 
  after_validation :createUsername
  attr_accessible :username, :password, :password_confirmation, :remember_me, :firstname, :lastname
  #attr_protected :password

  def createUsername
    # create username from first-last name
    firstnamePart=self.firstname[0,1].downcase
    lastnamePart=self.lastname[0,5].downcase
    username=lastnamePart + firstnamePart
    count=0
    while username.length != 7
      username=username + count.to_s
      count +=1
    end
    self.username=username
    #verify username uniqueness?
  end


  def self.find_first_by_auth_conditions(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

Sign up
1 error prohibited this user from being saved:
Email can't be blank