Rails:在Omniauth使用Devise登录后从Facebook检索图像

Question

我使用这些说明设置Facebook登录与Devise和omniauth https://github.com/plataformatec/devise/wiki/OmniAuth:-Overview

Devise wiki提供了从存储在此变量中的哈希获取facebook信息的一些说明.request.env['omniauth.auth']请参阅底部的哈希.

例如,Devise wiki为User.rb模型提供了这两种方法

def self.find_for_facebook_oauth(access_token, signed_in_resource=nil)
  data = access_token.extra.raw_info
  if user = User.where(:email => data.email).first
    user
  else # Create a user with a stub password. 
    User.create!(:email => data.email, :password => Devise.friendly_token[0,20]) 
  end
end

def self.new_with_session(params, session)
    super.tap do |user|
      if data = session["devise.facebook_data"] && session["devise.facebook_data"]["extra"]["raw_info"]
        user.email = data["email"]

      end
    end
  end

因此,使用下面的哈希,我将以下两个方法添加到以获取名称和图像

def self.find_for_facebook_oauth(access_token, signed_in_resource=nil)
  data = access_token.extra.raw_info
  if user = User.where(:email => data.email).first
    user
  else # Create a user with a stub password. 
    User.create!(:email => data.email, :password => Devise.friendly_token[0,20], :name => data.name, :image => access_token.info.image) #I added access_token.info.image based on first answer
  end
end

def self.new_with_session(params, session)
    super.tap do |user|
      if data = session["devise.facebook_data"] && session["devise.facebook_data"]["extra"]["raw_info"]
        user.email = data["email"]
        user.name = data["name"]
        user.image = access_token.info.image  #i changed this based on first answer below

      end
    end
  end

然后在我看来,我添加了以下内容以显示用户名和图像

<p>Name:<%= user.name %></p>
 <p>Image: <%= image_tag user.image %>

但是,只显示名称.没有图像.

在我的数据库中,我有一个列name和一个image列.Facebook的名称正在存储,但图片列显示'nil'

任何想法如何让图像工作？

哈希存储在 request.env['omniauth.auth'] https://github.com/mkdynamic/omniauth-facebook/blob/master/lib/omniauth/strategies/facebook.rb#L31-47

   info do
        prune!({
          'nickname' => raw_info['username'],
          'email' => raw_info['email'],
          'name' => raw_info['name'],
          'first_name' => raw_info['first_name'],
          'last_name' => raw_info['last_name'],
          'image' => "#{options[:secure_image_url] ? 'https' : 'http'}://graph.facebook.com/#{uid}/picture?type=square",
          'description' => raw_info['bio'],
          'urls' => {
            'Facebook' => raw_info['link'],
            'Website' => raw_info['website']
          },
          'location' => (raw_info['location'] || {})['name'],
          'verified' => raw_info['verified']
        })
      end

Answer 1

图像可以在env["omniauth.auth"]["info"]["image"].所以在你的情况下,access_token.info.image.

如果你想好好看看返回的嵌套哈希的哈希,看看自己的位置是什么,把它作为回调控制器的第一行:

render :text => "<pre>" + env["omniauth.auth"].to_yaml and return

编辑:好的,所以这就是你需要做的:

def self.find_for_facebook_oauth(omniauth)
  if user = User.find_by_email(omniauth.info.email)
    if omniauth.info.image.present?
      user.update_attribute(:image, omniauth.info.image)
    end
    user
  else # Create a user with a stub password. 
    User.create!(:email => omniauth.info.email,
                 :name => omniauth.info.name,
                 :image => omniauth.info.image,
                 :password => Devise.friendly_token[0,20])
  end
end

至于另一种方法,如果我没有弄错,它应该是这样的:

def self.new_with_session(params, session)
  super.tap do |user|
    if omniauth = session["devise.facebook_data"]
      user.email = omniauth.info.email
      user.name = omniauth.info.name
      user.image = omniauth.info.image
    end
  end
end

但是这个方法何时使用？当创建用户出现问题时,Devise会使用它.想象一下,身份验证提供商没有给你发电子邮件(例如Twitter,这样做),你能做什么？好吧,您可以将用户重定向到您可以完成注册过程的注册页面.但是,如果您重定向用户,则会丢失oauth收到的数据.解决方案是将此数据放入会话中.

所以在你的控制器中,你应该有类似的东西:

if user.save
  sign_in_and_redirect user, :event => :authentication
else
  session["devise.facebook_data"] = env["omniauth.auth"]
  redirect_to new_user_registration_url
end

然而,另一个问题是,大多数情况下,身份验证提供程序返回的数据太大而无法容纳在会话中,因此我们必须准确选择要在会话中放入的内容.由于您只获取名称和图像,因此您可以修改额外信息,如下所示:

session["devise.facebook_data"] = env["omniauth.auth"].except('extra')