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。
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。
おそらく:
puts variable.inspect
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"]
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?)
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(":")}
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
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]