{"id":26320,"date":"2017-02-17T10:29:58","date_gmt":"2017-02-17T10:29:58","guid":{"rendered":"https:\/\/dev.railscarma.com\/guide-converting-hash-struct-ruby\/"},"modified":"2021-06-05T12:52:38","modified_gmt":"2021-06-05T12:52:38","slug":"anleitung-konvertierung-hash-struktur-ruby","status":"publish","type":"post","link":"https:\/\/www.railscarma.com\/de\/blog\/fachartikel\/anleitung-konvertierung-hash-struktur-ruby\/","title":{"rendered":"Ein Leitfaden zur Umwandlung eines Hash in eine Struct in Ruby"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"26320\" class=\"elementor elementor-26320\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-3e12c92d elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"3e12c92d\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-610a0361\" data-id=\"610a0361\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-4b51e850 elementor-widget elementor-widget-text-editor\" data-id=\"4b51e850\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p align=\"justify\">Bevor wir uns n\u00e4her mit dem Konvertierungsprozess befassen, sollten wir zun\u00e4chst den Unterschied zwischen Hash und Struct herausfinden. Dies wird uns helfen, die Frage zu beantworten, warum einige lieber struct als hash in Ruby verwenden.<\/p>\n\n<h3>Unterscheidung zwischen Hash und Struct<\/h3>\n<p align=\"justify\">Ein Hash ist eine Sammlung von Schl\u00fcssel-Wert-Paaren und entspricht einem Array, mit der Ausnahme, dass die Indizierung \u00fcber die beliebigen Schl\u00fcssel beliebiger Objekttypen erfolgt (nicht \u00fcber den Integer-Index). Die Reihenfolge, in der ein Hash nach Wert oder Schl\u00fcssel durchlaufen wird, kann willk\u00fcrlich erscheinen - und muss im Allgemeinen nicht in der Schnittreihenfolge sein. Auf der anderen Seite ist struct die bequemere Art, die Anzahl der Attribute zu b\u00fcndeln. Dies geschieht durch die Zugriffsmethoden, ohne dass man explizite Klassen schreiben muss.<\/p>\n<p align=\"justify\">Struct erm\u00f6glicht es, eine Instanz mit einer Reihe von Zugriffsm\u00f6glichkeiten zu erzeugen, was f\u00fcr den Benutzer m\u00e4chtig und praktisch erscheint. Obwohl Hash \u00e4hnliches leisten kann, birgt es einige Fallstricke, die Sie vielleicht nicht m\u00f6gen. Struct ist einfacher zu verstehen, was die Benutzer zu einer besser wartbaren Kodierung f\u00fchrt. Dar\u00fcber hinaus ist es erw\u00e4hnenswert, dass struct dem Hash \u00fcberlegen ist, wenn es um die Geschwindigkeit des Datenabrufs geht, was Sie wissen l\u00e4sst, dass struct im Vergleich zum Hash die bessere Wahl f\u00fcr die Konfiguration sein kann, auf die in wiederholter Weise zur Laufzeit zugegriffen werden muss.<\/p>\n\n<h3>Umwandlung von Hash in Struct in Ruby<\/h3>\n<p align=\"justify\">Angesichts der Tatsache, dass wir die beiden kennen, werden viele vielleicht lieber struct als hash verwenden. Aber wir wollen uns hier darauf konzentrieren, dass hinter der geringen Leistung von Hashs immer noch Vorteile liegen k\u00f6nnen. Wenn Sie es nicht auf seine eigene kleine Weise verwenden k\u00f6nnen, dann konvertieren Sie es in struct, so dass eine bessere Nutzbarkeit erreicht werden kann.<\/p>\n<p align=\"justify\">Wenn Sie die Struktur bereits definiert haben und die Konvertierung von has in struct einleiten wollen, k\u00f6nnen wir Ihnen mit den folgenden Methoden in einem gegebenen Beispiel weiterhelfen. Wenn Sie Hash in eine Struktur in Ruby konvertieren wollen, sagen wir zum Beispiel, wir haben ein gegebenes of:<\/p>\n\n<pre><code>h = { :a =&gt; 1, :b =&gt; 2 }\nund eine Struktur wie folgt haben wollen:\ns.a == 1\ns.b == 2<\/code><\/pre>\nF\u00fcr die Umwandlung k\u00f6nnen Sie eine der folgenden Methoden anwenden:\n<strong>Umrechnung Methode 1:<\/strong>\n\nBei dieser Methode wird das Ergebnis als OpenStruct und nicht speziell als struct angezeigt:\n<pre><code>pry(main)&gt; require 'ostruct'\npry(main)&gt; s = OpenStruct.new(h)\n=&gt; #\npry(main)&gt; setzt s.a, s.b\n1\n2<\/code><\/pre>\n<strong>Umrechnung Methode 2:<\/strong>\n\nWenn Sie bereits eine struct definiert haben und etwas mit einer Raute beginnen wollen, k\u00f6nnen Sie dies tun:\n<pre><code>Person = Struct.new(:vor_name, :nach_name, :alter)\n\nperson_hash = { vor_name: \"Foo\", nach_name: \"Bar\", alter: 29 }\n\nperson = Person.new(*person_hash.values_at(*Person.members))\n\n=&gt; #<\/code><\/pre>\n<strong>Umrechnungsmethode 3: <\/strong>\n\nDa die Reihenfolge der Hash-Schl\u00fcssel in Ruby 1.9+ garantiert wurde, k\u00f6nnen Sie dies befolgen:\n<pre><code>s = Struct.new(*(k = h.keys)).new(*h.values_at(*k))<\/code><\/pre>\nDas Beispiel f\u00fcr die Umwandlung von Hash in Struct kann Ihnen helfen, aber wenn Sie eine umfassendere Idee haben m\u00f6chten, sollten Sie sich an Fachleute wenden, um formale Unterst\u00fctzung zu erhalten.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-54bd0f38 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"54bd0f38\" data-element_type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div 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Dies wird uns helfen, die Frage zu beantworten, warum einige lieber struct als hash in Ruby verwenden. Unterscheidung zwischen Hash und Struct Hash ist die Sammlung von Schl\u00fcssel-Wert-Paaren ...<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/www.railscarma.com\/de\/blog\/how-to-build-a-scalable-saas-platform-using-ruby-on-rails\/\"> <span class=\"screen-reader-text\">Wie man eine skalierbare SaaS-Plattform mit Ruby on Rails aufbaut<\/span> Weiterlesen \u00bb<\/a><\/p>","protected":false},"author":1,"featured_media":31801,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[384],"tags":[],"class_list":["post-26320","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technical-articles"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>A Guide on Converting a Hash to a Struct in Ruby - RailsCarma - Ruby on Rails Development Company specializing in Offshore Development<\/title>\n<meta name=\"description\" content=\"Before we get deeper in to the conversion process, let us all first identify the difference between the two \u2013 the hash and the struct. 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