如果你只是在对象中寻找实例变量，这可能是有用的:

obj.instance_variables.each do |var|
  puts [var, obj.instance_variable_get(var).inspect].join(":")
end

或者作为一行代码用于复制和粘贴:

obj.instance_variables.each{ |var| puts [var, obj.instance_variable_get(var).inspect].join(":")}

把foo.to_json

可能会派上用场，因为json模块是默认加载的

pp File.stat(“/ tmp”)

#<File::Stat
 dev=0x1000004,
 ino=71426291,
 mode=041777 (directory rwxrwxrwt),
 nlink=15,
 uid=0 (root),
 gid=0 (wheel),
 rdev=0x0 (0, 0),
 size=480,
 blksize=4096,
 blocks=0,
 atime=2021-04-20 17:50:33.062419819 +0800 (1618912233),
 mtime=2021-04-21 11:35:32.808546288 +0800 (1618976132),
 ctime=2021-04-21 11:35:32.808546288 +0800 (1618976132)>

p object

Ruby doc表示p。

p (* args) 对于每个对象，直接写入obj。检查之后 通过换行符转换到程序的标准输出。

如果你只是在对象中寻找实例变量，这可能是有用的:

obj.instance_variables.each do |var|
  puts [var, obj.instance_variable_get(var).inspect].join(":")
end

或者作为一行代码用于复制和粘贴:

obj.instance_variables.each{ |var| puts [var, obj.instance_variable_get(var).inspect].join(":")}

object.attribute_names

# => ["id", "name", "email", "created_at", "updated_at", "password_digest", "remember_token", "admin", "marketing_permissions", "terms_and_conditions", "disable", "black_list", "zero_cost", "password_reset_token", "password_reset_sent_at"]


object.attributes.values

# => [1, "tom", "tom@tom.com", Tue, 02 Jun 2015 00:16:03 UTC +00:00, Tue, 02 Jun 2015 00:22:35 UTC +00:00, "$2a$10$gUTr3lpHzXvCDhVvizo8Gu/MxiTrazOWmOQqJXMW8gFLvwDftF9Lm", "2dd1829c9fb3af2a36a970acda0efe5c1d471199", true, nil, nil, nil, nil, nil, nil, nil]