298

簡単な Ruby スクリプトを実行しているときに、オブジェクトのフィールドをコンソールにダンプする最も簡単な方法は何ですか?

print_r()配列でも機能する PHP に似たものを探しています。

4

11 に答える 11

462

おそらく：

puts variable.inspect
于 2008-12-09T23:08:27.030 に答える
57

methodsオブジェクトのメソッドの配列を返すメソッドの用途が見つかるかもしれません。と同じではありませんprint_rが、それでも役立つ場合があります。

>> "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"]
于 2008-12-09T23:33:06.140 に答える
52

メソッドはto_yaml時々役立つようです：

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

puts $foo.to_yaml

戻り値

--- 
:age: 43
:name: Clem

(これは、ロードされているモジュールに依存しますYAMLか? それとも、通常は利用可能でしょうか?)

于 2009-10-06T23:54:29.557 に答える
33 
p object

のRubyドキュメントp。

p(*args) public

オブジェクトごとに、obj.inspectに続けて改行をプログラムの標準出力に直接書き込みます。

于 2008-12-10T03:34:19.567 に答える
16

オブジェクト内のインスタンス変数だけを探している場合は、これが役立つ場合があります。

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

または、コピーして貼り付けるためのワンライナーとして：

obj.instance_variables.each{ |var| puts [var, obj.instance_variable_get(var).inspect].join(":")}
于 2013-01-14T15:23:24.493 に答える
10

puts foo.to_json

json モジュールがデフォルトでロードされるので便利かもしれません

于 2010-08-20T09:55:49.170 に答える
3 
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]
于 2015-06-03T21:56:41.547 に答える