小编Ann*_*lla的帖子

我在rails上运行rubocop,它给了我下面的消息.

W: Shadowing outer local variable - user.
  where(provider: auth.provider, uid: auth.uid).first_or_create do |user|
                                                                    ^^^^

这是代码.

def self.from_omniauth(auth)
user = User.where(email: auth.info.email).first

if user
  return user
else
  where(provider: auth.provider, uid: auth.uid).first_or_create do |user|
    user.fullname = auth.info.name
    user.provider = auth.provider
    user.uid = auth.uid
    user.email = auth.info.email
    user.image = auth.info.image
    user.password = Devise.friendly_token[0, 20]
  end
end

结束

Ruby文件:

student_ages = {
"Jack" => 10,
"Jill" => 12,
"Bob" => 14
}

如何从哈希中选择杰克和吉尔？

student_ages.select {|key| k.length <= 4}