gistfile1.rb

### DEVISE 1.1.3 ###

class User < ActiveRecord::Base
    
  before_save :downcase_email

  def self.find_for_authentication(conditions) 
    conditions[:email].try(:downcase!)
    super
  end

  def self.find_or_initialize_with_error_by(attribute, value, error=:invalid)
    value.downcase! if attribute == :email
    super
  end

  protected

  def downcase_email
    self.email.downcase!
  end

end

### DEVISE LATEST ###

class User < ActiveRecord::Base
    
  before_save :downcase_email

  def self.find_for_authentication(conditions) 
    conditions[:email].try(:downcase!)
    super
  end

  def self.find_or_initialize_with_errors(required_attributes, attributes, error=:invalid)
    attributes[:email].try(:downcase!)
    super
  end

  protected

  def downcase_email
    self.email.downcase!
  end

end