链接facebook到现有的帐户/ omniauth

Question

这么简单，我想链接到一个现有的用户帐户他的facebook个人资料(优先考虑最初注册的电子邮件)在我的rails应用程序，使用omniauth和设计。

我读过这本书，但对我没有多大帮助。

我当前的结构是这样的

Answer 1

下面是我如何实现它的一个例子。如果用户已经登录，那么我调用一个方法将他们的帐户与Facebook链接起来。否则，我将执行与"设计-全能"wiki页面中概述的相同过程。

# users/omniauth_callbacks_controller.rb
def facebook
  if user_signed_in?
    if current_user.link_account_from_omniauth(request.env["omniauth.auth"])
      flash[:notice] = "Account successfully linked"
      redirect_to user_path(current_user) and return
    end
  end
  @user = User.from_omniauth(request.env["omniauth.auth"])
  if @user.persisted?
    sign_in_and_redirect @user, event: :authentication #this will throw if @user is not activated
    set_flash_message(:notice, :success, kind: "Facebook") if is_navigational_format?
  else
    session["devise.facebook_data"] = request.env["omniauth.auth"]
    redirect_to new_user_registration_url
  end
end
# app/models/user.rb
class << self
  def from_omniauth(auth)
    new_user = where(provider: auth.provider, uid: auth.uid).first_or_initialize
    new_user.email = auth.info.email
    new_user.password = Devise.friendly_token[0,20]
    new_user.skip_confirmation!
    new_user.save
    new_user
  end
end
def link_account_from_omniauth(auth)
  self.provider = auth.provider
  self.uid = auth.uid
  self.save
end