如何转储对象的控制台领域？

Question

当我运行一个简单的Ruby脚本，什么是转储对象的田间地头到控制台的最简单的方法？

我在寻找类似PHP的print_r()东西，将使用数组为好。

Answer 1

可能：

puts variable.inspect

Answer 2

您可能会发现它返回的用于一个对象的方法阵列的方法methods的用途。这是不一样的print_r，但仍然有用在次。

>> "Hello".methods.sort
=> ["%", "*", "+", "<", "<<", "<=", "<=>", "==", "===", "=~", ">", ">=", "[]", "[]=", "__id__", "__send__", "all?", "any?", "between?", "capitalize", "capitalize!", "casecmp", "center", "chomp", "chomp!", "chop", "chop!", "class", "clone", "collect", "concat", "count", "crypt", "delete", "delete!", "detect", "display", "downcase", "downcase!", "dump", "dup", "each", "each_byte", "each_line", "each_with_index", "empty?", "entries", "eql?", "equal?", "extend", "find", "find_all", "freeze", "frozen?", "grep", "gsub", "gsub!", "hash", "hex", "id", "include?", "index", "inject", "insert", "inspect", "instance_eval", "instance_of?", "instance_variable_defined?", "instance_variable_get", "instance_variable_set", "instance_variables", "intern", "is_a?", "is_binary_data?", "is_complex_yaml?", "kind_of?", "length", "ljust", "lstrip", "lstrip!", "map", "match", "max", "member?", "method", "methods", "min", "next", "next!", "nil?", "object_id", "oct", "partition", "private_methods", "protected_methods", "public_methods", "reject", "replace", "respond_to?", "reverse", "reverse!", "rindex", "rjust", "rstrip", "rstrip!", "scan", "select", "send", "singleton_methods", "size", "slice", "slice!", "sort", "sort_by", "split", "squeeze", "squeeze!", "strip", "strip!", "sub", "sub!", "succ", "succ!", "sum", "swapcase", "swapcase!", "taguri", "taguri=", "taint", "tainted?", "to_a", "to_f", "to_i", "to_s", "to_str", "to_sym", "to_yaml", "to_yaml_properties", "to_yaml_style", "tr", "tr!", "tr_s", "tr_s!", "type", "unpack", "untaint", "upcase", "upcase!", "upto", "zip"]

Answer 3

在to_yaml方法似乎是有用有时：

$foo = {:name => "Clem", :age => 43}

puts $foo.to_yaml

返回

--- 
:age: 43
:name: Clem

（这是否取决于一些YAML模块上被加载？或者将通常可用？）

Answer 4

p object

红宝石文档为p。

  

p(*args) public

     

对于每个对象，直接写入obj.inspect随后   一个换行该程序的标准输出。

Answer 5

如果您正在寻找的只是对象的实例变量，这可能是有用的：

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

或作为一衬垫用于复制和粘贴：

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

Answer 6

把foo.to_json

可能会派上用场由于JSON模块默认加载

Answer 7

如果您想已经打印的缩进的JSON

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

Answer 8

我碰到这个线程来了，因为我一直在寻找类似的东西。我喜欢的答复，他们给了我一些想法，所以我测试了.to_hash方法和工作非常出色的使用情况了。洙：

object.to_hash

Answer 9

object.attributes_name

=> [ “ID”， “名称”， “电子邮件”， “created_at”， “的updated_at”， “password_digest”， “remember_token”， “管理员”， “marketing_permissions”， “TERMS_AND_CONDITIONS”， “禁止”， “black_list”， “zero_cost”， “password_reset_token”， “password_reset_sent_at”]

object.attributes.values

=> [1， “汤姆”， “tom@tom.com”，星期二，2015年6月2日零时16分03秒UTC 00：00，星期二，2015年6月2日0时22分35秒UTC 00： 00， “$ 2A $ 10 $ gUTr3lpHzXvCDhVvizo8Gu / MxiTrazOWmOQqJXMW8gFLvwDftF9Lm”， “2dd1829c9fb3af2a36a970acda0efe5c1d471199”，真实，零，零，零，零，零，零，零]