{"id":3560,"date":"2019-09-03T07:23:00","date_gmt":"2019-09-03T07:23:00","guid":{"rendered":"http:\/\/the-codest.localhost\/blog\/ruby-3-0-ruby-and-lesser-known-privacy-control-methods\/"},"modified":"2026-04-27T09:52:00","modified_gmt":"2026-04-27T09:52:00","slug":"ruby-3-0-ruby-och-mindre-kanda-metoder-for-sekretesskontroll","status":"publish","type":"post","link":"https:\/\/thecodest.co\/sv\/blog\/ruby-3-0-ruby-and-lesser-known-privacy-control-methods\/","title":{"rendered":"Ruby 3.0. Ruby och mindre k\u00e4nda metoder f\u00f6r sekretesskontroll"},"content":{"rendered":"

Grundl\u00e4ggande l\u00f6sningar<\/h2>\n\n\n\n

L\u00e5t oss anta att vi anv\u00e4nder klassen Foo som har en offentlig metod och en privat metod:<\/p>\n\n\n\n

klass Foo\n  def bar\n    :fantastisk\n  slut\n\n  privat\n\n  def baz\n    :n\u00e5got_privat\n  slut\nslut<\/code><\/pre>\n\n\n\n
Allt \u00e4r bra, vi ser en s\u00e5dan l\u00f6sning i praktiskt taget alla projekt<\/a>. L\u00f6pande Foo.new.baz<\/code> kommer att orsaka felet NoMethodError (privat metod 'baz' anropad f\u00f6r # )<\/em> och det var det vi menade att g\u00f6ra. Vad h\u00e4nder om vi f\u00f6rs\u00f6ker \u00e4ndra sparformatet och l\u00e4gga till private som ett prefix i klassdefinitionen?<\/p>\n\n\n\n
klass Foo\n  def bar\n    :fantastisk\n  slut\n\n  privat def baz\n    :n\u00e5got_privat\n  slut\nslut<\/code><\/pre>\n\n\n\n
Som du kan se efter att ha k\u00f6rt kod<\/a>, det fungerar faktiskt! Varf\u00f6r kan vi ange metodens synlighet innan vi g\u00f6r den? D\u00e4rf\u00f6r att n\u00e4r man definierar en metod returnerar def namnet p\u00e5 metoden som en symbol. Detta uttryck \u00e4r inte bara en del av syntaxen, utan de facto en metod som h\u00e4rr\u00f6r fr\u00e5n klassen Module och som behandlar denna symbol som ett argument. F\u00f6r mer information, se dokumentationen i denna l\u00e4nk<\/a>. Eftersom det b\u00f6rjade s\u00e5 enkelt med private, l\u00e5t oss f\u00f6rs\u00f6ka \u00e4ndra synligheten f\u00f6r den privata metoden.<\/p>\n\n\n\n
klass Foo\n  def bar\n    :fantastisk\n  slut\n\n  privat def baz\n    :n\u00e5got_privat\n  slut\n\n  offentlig :baz\nslut<\/code><\/pre>\n\n\n\n
Vad h\u00e4nder n\u00e4r du har k\u00f6rt koden?<\/h2>\n\n\n\n
irb(main):012:0> Foo.new.baz\n=> :n\u00e5got_privat<\/code><\/pre>\n\n\n\n
Framg\u00e5ng! V\u00e5r metod f\u00f6r baser blev offentlig eftersom vi gjorde den synlig tv\u00e5 g\u00e5nger. Naturligtvis g\u00e4ller samma operation f\u00f6r modulerna.
\u200b
Bra, men var f\u00e5r den oss<\/a>?
\u200b
Denna funktionalitet ger oss mycket eftersom vi fritt kan \u00e4ndra synligheten f\u00f6r en metod n\u00e4r vi definierar den, eller till och med \u00e4ndra synligheten f\u00f6r metoder n\u00e4r vi \u00e4rver dem.<\/p>\n\n\n\n
L\u00e5t oss nu ta en titt p\u00e5 vad Ruby<\/a> 2.7 kan g\u00f6ra n\u00e4r det g\u00e4ller att \u00e4ndra synligheten f\u00f6r aliaser och accessorer.<\/p>\n\n\n\n
klass Foo\n  privat attr_accessor :awesome_variabel\nslut<\/code><\/pre>\n\n\n\n
Tyv\u00e4rr f\u00e5r vi ett fel eftersom den privata metoden f\u00f6rv\u00e4ntar sig symboler och attr_accessor. Koden returnerar nil och d\u00e4rmed \u00e4r den h\u00e4r metoden inte kompatibel med den privata anv\u00e4ndningen i Ruby 2.7. S\u00e5 vad \u00e4r v\u00e5ra alternativ?<\/p>\n\n\n\n
    \n
  1. Vi kan anv\u00e4nda attr_accessor under nyckelordet private f\u00f6r att f\u00e5 det att fungera, dvs. vi kommer att f\u00e5 ett fel n\u00e4r vi vill h\u00e4nvisa till awesome_variabelawesome_variabel<\/code> metod.<\/li>\n<\/ol>\n\n\n\n
    klass Foo\n  privat\n\n  attr_accessor :awesome_variabel\nslut<\/code><\/pre>\n\n\n\n
      \n
    1. Det andra alternativet \u00e4r att exekvera den privata metoden p\u00e5 metoder som genereras av attr_attribut<\/code>; i det h\u00e4r fallet m\u00e5ste vi ocks\u00e5 komma ih\u00e5g att ange settern d\u00e4r.<\/li>\n<\/ol>\n\n\n\n
      klass Foo\n  attr_accessor :awesome_variabel\n\n  privat :awesome_variabel, :awesome_variabel=\nslut<\/code><\/pre>\n\n\n\n
      Problem med Attr_ *<\/code> metoder \u00e4r inte de enda hindren. Vi kan st\u00f6ta p\u00e5 samma problem n\u00e4r vi vill skapa ett privat alias.<\/p>\n\n\n\n
      klass Foo\n  private alias :bar, :awesome_bar\nslut<\/code><\/pre>\n\n\n\n
      <\/p>\n\n\n\n
      Ruby 3.0 och v\u00e5r verksamhet<\/h2>\n\n\n\n
      Lyckligtvis introducerar Ruby 3.0 en stor f\u00f6r\u00e4ndring eftersom synlighetsmetoderna kan ta matrisen som ett argument och metodernas alias, attr_ *, kan \u00e5terst\u00e4lla matrisen med namnen p\u00e5 de metoder som har definierats. Du kan l\u00e4sa mer h\u00e4r<\/a>.<\/p>\n\n\n\n
      L\u00e5t oss nu se n\u00e5gra exempel i den senaste euba och kontrollera om \u00e4ndringarna faktiskt har gjorts och hur vi kan anv\u00e4nda dem.
      \u200b
      I det f\u00f6rsta exemplet anv\u00e4nder vi private f\u00f6re accessorn attr:<\/p>\n\n\n\n
      klass Foo\n  privat attr_accessor :awesome_variabel\nslut<\/code><\/pre>\n\n\n\n
      Ett s\u00e5dant anrop kommer inte att orsaka fel vid tolkningen av syntaxen och, vilket \u00e4r viktigt, fantastisk_variabel<\/code> ochfantastisk_variabel =<\/code>metoder blir privata.
      \u200b
      Aliasmetoden g\u00f6r samma sak, men nu returnerar den ocks\u00e5 en symbol som namn p\u00e5 den nya metoden och g\u00f6r den synlig.<\/p>\n\n\n\n
      klass Foo\n  private alias :bar, :awesome_bar\nslut<\/code><\/pre>\n\n\n\n
      Ett intressant faktum \u00e4r att vi ocks\u00e5 kan f\u00f6rdjupa oss i ytterligare metoder, t.ex. den fantastiskautskriftsmodul kan anropas mellan private och attr<\/em>l\u00e4sare; det \u00e4r viktigt att en s\u00e5dan metod returnerar en array med namnen p\u00e5 de metoder som finns p\u00e5 h\u00f6ger sida av uttrycket.<\/p>\n\n\n\n
      klass Modul\n  def awesome_print(namn)\n    s\u00e4tter namn\n    namn\n  slut\nslut\nklass Foo\n  private awesome_print attr_reader :awesome_bar\nslut <\/span><\/code><\/pre>\n\n\n\n
      Sammanfattning<\/h2>\n\n\n\n
      Hoppas att du kommer att hitta den h\u00e4r artikeln anv\u00e4ndbar! I h\u00e4ndelse av fler nyheter om Ruby 3.0. l\u00e4s mer h\u00e4r<\/a>.<\/p>\n\n\n\n
      Trevlig kodning!<\/p>\n\n\n\n
      \"Erbjudande<\/a><\/figure>\n\n\n\n
      L\u00e4s mer om detta:<\/strong><\/p>\n\n\n\n
      H\u00e5ll k\u00e4ften och ta dina pengar #1: Dolda kostnader och verklig smidighet i produktutvecklingsprocessen<\/a><\/p>\n\n\n\n
      CTO-utmaningar - uppskalning och tillv\u00e4xt av mjukvaruprodukter<\/a><\/p>","protected":false},"excerpt":{"rendered":"
      En av de mest \u00e4lskade funktionerna i Ruby \u00e4r dess mycket flexibla syntax. Personligen \u00e4lskar jag Ruby f\u00f6r hur m\u00e5nga m\u00f6jligheter vi har att definiera klasser och deras egenskaper, och det \u00e4r vad jag kommer att diskutera i den h\u00e4r artikeln.<\/p>","protected":false},"author":2,"featured_media":3561,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[8],"tags":[],"class_list":["post-3560","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-software-development"],"acf":[],"yoast_head":"\nRuby 3.0. Ruby and lesser known privacy control methods - The Codest<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/thecodest.co\/sv\/blogg\/ruby-3-0-ruby-och-mindre-kanda-metoder-for-sekretesskontroll\/\" \/>\n<meta property=\"og:locale\" content=\"sv_SE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ruby 3.0. Ruby and lesser known privacy control methods\" \/>\n<meta property=\"og:description\" content=\"One of the most beloved features of Ruby is its very flexible syntax. 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