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Deviseでメールアドレス以外のカラムをログイン認証に利用する

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例えばアカウント名(accountカラム)で認証を行いたい場合はuserモデルに以下を追加する。

models/user.rb
devise :authentication_keys => [ :account ]

さらにアカウント名、もしくはメールアドレスのどちらかで認証したい場合は入力値を受け取るための適当なattributeを追加し、self.find_first_by_auth_conditionsをオーバーライドすることで実現できる。

models/user.rb
devise :authentication_keys => [ :login ]

attr_accessor :login

def self.find_first_by_auth_conditions(warden_conditions)
  conditions = warden_conditions.dup
  if login = conditions.delete(:login)
    where(conditions).where(["account = :value OR email = :value", { :value => login }]).first
  else
    where(conditions).first
  end
end
semind
VPoEとかやってます。
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