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] 

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(":")}

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。

我使用自己的解决方案打印和调试变量是https://github.com/igorkasyanchuk/wrapped_print

您可以简单地调用user。Wp在日志中查看该变量的值

而不是:

puts "-"*10
puts user.inspect
puts "-"*10

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] 

如果你想打印一个已经缩进的JSON:

require 'json'
...
puts JSON.pretty_generate(JSON.parse(object.to_json))