{"id":6489,"date":"2014-09-05T04:52:31","date_gmt":"2014-09-05T04:52:31","guid":{"rendered":"https:\/\/dev.railscarma.com\/how-to-use-rack-middleware-in-rails-for-auto-completion\/"},"modified":"2021-06-07T07:24:29","modified_gmt":"2021-06-07T07:24:29","slug":"hur-man-anvander-rackmellanvara-i-skenor-for-automatisk-komplettering","status":"publish","type":"post","link":"https:\/\/www.railscarma.com\/sv\/blogg\/ledning\/hur-man-anvander-rackmellanvara-i-skenor-for-automatisk-komplettering\/","title":{"rendered":"Hur man anv\u00e4nder Rack Middleware i Rails f\u00f6r automatisk komplettering?"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"6489\" class=\"elementor elementor-6489\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-266fe932 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"266fe932\" 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-69f67138\" data-id=\"69f67138\" 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-79e902b4 elementor-widget elementor-widget-text-editor\" data-id=\"79e902b4\" 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 style=\"text-align: justify;\">I dagens moderna webbapplikationer \u00e4r automatisk komplettering\/ autof\u00f6rslag mycket vanliga fr\u00e5n sm\u00e5 till mycket stora applikationer, att servera flera f\u00f6rfr\u00e5gningar samtidigt med snabb respons fr\u00e5n servern \u00e4r mycket viktigt f\u00f6r att g\u00f6ra anv\u00e4ndarupplevelsen b\u00e4ttre och njutbar.<\/p>\n<p style=\"text-align: justify;\"><strong> H\u00e4r kommer rackmellanvara i bilden.<\/strong><\/p>\n\n<h5 style=\"text-align: justify;\"><strong>Vad \u00e4r Rack Middleware<\/strong>?<\/h5>\n<p style=\"text-align: justify;\">Enkelt uttryckt l\u00e5ter en Rack-mellanvara oss g\u00f6ra saker f\u00f6re eller efter i en rackapplikation. Rackmellanvara initieras med en rackapplikation och b\u00f6r svara p\u00e5 en anropsmetod.<\/p>\n<p style=\"text-align: justify;\">Rackmellanvara kan vidare l\u00e4mna \u00f6ver kontrollen till annan rackmellanvara eller bara svara tillbaka med en svarskod, inneh\u00e5llstyp och text.<\/p>\n<p style=\"text-align: justify;\">1 [200, {&#039;Content-type&#039; =&gt; &#039;text\/html&#039;},[&#039;Hej webben&#039;]]<\/p>\n\n<h5 style=\"text-align: justify;\"><strong>Hur kan du anv\u00e4nda detta i en Rails-applikation<\/strong>?<\/h5>\n<p style=\"text-align: justify;\"><a href=\"https:\/\/www.railscarma.com\/sv\/\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>R\u00e4ls<\/strong><\/a> har redan en f\u00f6rdefinierad upps\u00e4ttning rackmellanvaror f\u00f6r cachning, sessionshantering etc, du kan titta p\u00e5 aktuell mellanvara genom att k\u00f6ra rakemellanvara.<\/p>\n<p style=\"text-align: justify;\">Bortsett fr\u00e5n detta ger Rails ocks\u00e5 ett utm\u00e4rkt s\u00e4tt att l\u00e4gga till din egen Rack-mellanvara till din applikation. Att anv\u00e4nda en Rack-mellanvara f\u00f6r att hantera automatiska kompletteringar \u00e4r bra, eftersom det ger dig en liten prestanda\u00f6kning j\u00e4mf\u00f6rt med att hantera beg\u00e4ran i en Rails-kontroller.<\/p>\n<p style=\"text-align: justify;\">S\u00e5 l\u00e5t oss titta p\u00e5 lite kod f\u00f6r hur man uppn\u00e5r detta. Krav \u2013 Anv\u00e4ndaren ska vara autentiserad \u2013 Svara med json med resultatet av fr\u00e5gan \u2013 Hantera svaret p\u00e5 klientsidan med javascript.<\/p>\n<p style=\"text-align: justify;\">Ruby Rack Middleware-Skapa en katalog f\u00f6r middlewares i din rails-applikation mkdir app\/middleware.<\/p>\n<p style=\"text-align: justify;\">Skapa en ny fil app\/middleware\/auto_completer.rb class AutoCompleter def initialize(app) @app = app end def call(env) @request = Rack::Request.new(env) if env[\u201cPATH_INFO\u201d] == \u201c \/autocomplete\u201d session = @request.env[&#039;rack.session&#039;] params = @request.params om session &amp;&amp; session[\u201cuser_id\u201d].present? users = User.select(\u201cid, name\u201d).like(params[\u201cq\u201d]) [200, {\u201cContent-Type\u201d =&gt; \u201capplication\/json\u201d}, [users.to_json]] else [404, {\u201cContent-Type\u201d =&gt; \u201ctext\/html\u201d}, [\u201cNot Found\u201d]] end else @app.call(env) end end end.<\/p>\n<p style=\"text-align: justify;\">Ovanst\u00e5ende kod initieras med en instans av rackapplikation, varefter kontrollen \u00f6verl\u00e4mnas till anropsmetoden. I anropsmetoden kontrollerar vi om s\u00f6kv\u00e4gen f\u00f6r beg\u00e4ran matchar autocomplete. Vi kontrollerar sedan sessionen och hittar matchande anv\u00e4ndare och returnerar en json med ett 200-svar.<\/p>\n<p style=\"text-align: justify;\">Om beg\u00e4ran inte st\u00e4mmer \u00f6verens med autcomplete request-s\u00f6kv\u00e4gen l\u00e4mnar vi \u00f6ver kontrollen till den andra rackmellanvaran. Redigera din config\/application.rb f\u00f6r att konfigurera Rails f\u00f6r att h\u00e4mta den nya mellanvaran<\/p>\n<p style=\"text-align: justify;\">config.middleware.insert_after ActionDispatch::Session::CookieStore, &quot;AutoCompleter&quot;<\/p>\n<p style=\"text-align: justify;\">Detta s\u00e4ger \u00e5t rails att infoga den nya mellanvaran vi har gjort efter sessionens mellanvara. K\u00f6r kommandot igen f\u00f6r att se att du kan se att den nya mellanvaran lades till efter<\/p>\n<p style=\"text-align: justify;\">ActionDispatch::Session::CookieStore rake-mellanvara<\/p>\n<p style=\"text-align: justify;\">Starta din Rails-server och g\u00e5 till localhost:3000\/autocomplete?q=h<\/p>\n<p style=\"text-align: justify;\">F\u00f6rv\u00e4ntat svar [{\u201cid\u201d:2,\u201dname\u201d:\u201dHarry\u201d},{\u201cid\u201d:4,\u201dname\u201d:\u201dHarold\u201d}]<\/p>\n<p style=\"text-align: justify;\">Javascript Vi kommer att anv\u00e4nda jquery-ui plugin f\u00f6r autokomplettering. Inkludera jquery-ui i assets\/javascript\/application.js<\/p>\n<p style=\"text-align: justify;\">L\u00e4gg till JavaScript i assets\/javascript\/application.js f\u00f6r att g\u00f6ra beg\u00e4ran om autoslutf\u00f6rande<\/p>\n<p style=\"text-align: justify;\">$(function() { $.ui.autocomplete.prototype._renderItem = function (ul, item) { label = item.name.replace(new RegExp(\u201c(?![^&amp;;]+;)(?!&lt; [^&lt;&gt;]*)(\u201d + $.ui.autocomplete.escapeRegex(this.term) + \u201c)(?![^&lt;&gt;]*&gt;)(?![^&amp;;]+;)\u201d, \u201c gi&quot;), &quot;<strong>$1<\/strong>&quot;); returnera $(\u201c<\/p>\n\n<ul style=\"text-align: justify;\">\n \t<li>\u201c) .data(\u201citem.autocomplete\u201d, item) .append(\u201c\u201d + label + \u201c\u201d) .appendTo(ul); };<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">$( \u201c#autocomplete\u201d ).autocomplete({ source: function(req,res){ $.getJSON(\u201c\/autocomplete\u201d, { q : req.term }, res) }, minLength: 1, select: function( event, ui ) { $(\u201c#selected\u201d).append(\u201d Id: \u201d + ui.item.id + \u201d Namn: \u201d + ui.item.name + \u201c\u201d); } }); });<\/p>\n<p style=\"text-align: justify;\">Den f\u00f6rsta kodbiten korrigerar metoden _renderItem i jQuery-ui auto complete plugin f\u00f6r att anv\u00e4nda json-formatet vi skickar fr\u00e5n servern.<\/p>\n<p style=\"text-align: justify;\">Den andra delen \u00e4r ganska okomplicerad d\u00e4r vi kopplar det automatiska kompletteringsanropet till ett html-element-id i DOM.<\/p>\n<p style=\"text-align: justify;\">Observera att vi har anv\u00e4nt &quot;q&quot; som namn p\u00e5 fr\u00e5geparametern ist\u00e4llet f\u00f6r standardparametern &quot;term&quot;.<\/p>\n<p style=\"text-align: justify;\">Rails Controller och View<\/p>\n<p style=\"text-align: justify;\">Generera en ny styrst\u00e4llningsst\u00e4llning skenor genererar styrenhetsindex<\/p>\n<p style=\"text-align: justify;\">Redigera en ny mall dash\/index.html.erb<\/p>\n\n<h1 style=\"text-align: justify;\"><span style=\"font-size: medium;\">Todo-appen<\/span><\/h1>\n<p style=\"text-align: justify;\">&lt;<\/p>\n<p style=\"text-align: justify;\">p&gt;Autoslutf\u00f6rande<\/p>\n<p style=\"text-align: justify;\"><code><span style=\"color: #0000bb;\">&lt;?php\n<\/span><\/code><code><span style=\"color: #007700;\">= <\/span><\/code><code><span style=\"color: #0000bb;\">text_field_tag <\/span><\/code><code><span style=\"color: #007700;\">:<\/span><\/code><code><span style=\"color: #0000bb;\">anv\u00e4ndar ID<\/span><\/code><code><span style=\"color: #007700;\">, <\/span><\/code><code><span style=\"color: #0000bb;\">noll<\/span><\/code><code><span style=\"color: #007700;\">, :<\/span><\/code><code><span style=\"color: #0000bb;\">id <\/span><\/code><code><span style=\"color: #007700;\">=&gt; <\/span><\/code><code><span style=\"color: #dd0000;\">&quot;autoslutf\u00f6rande&quot; <\/span><\/code><code><span style=\"color: #007700;\">-\n<\/span><\/code><code><span style=\"color: #0000bb;\">?&gt;<\/span><\/code><\/p>\n<p style=\"text-align: justify;\">Starta servern och g\u00e5 <a href=\"http:\/\/localhost:3000\/dash\">http:\/\/localhost:3000\/dash<\/a><\/p>\n<a href=\"\/sv\/kontakta-oss\/\">Kontakta oss.<\/a>\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-670da464 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"670da464\" 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 class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-14dcfbdc\" data-id=\"14dcfbdc\" 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-1ee25b68 elementor-widget elementor-widget-heading\" data-id=\"1ee25b68\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Prenumerera f\u00f6r de senaste uppdateringarna<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-168e791d elementor-widget elementor-widget-shortcode\" data-id=\"168e791d\" data-element_type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-shortcode\">\t\t\t\t\t<script type=\"text\/javascript\">\n\t\t\t\t\t\tvar gCaptchaSibWidget;\n                        var onloadSibCallbackInvisible = function () {\n\n                            var element = document.getElementsByClassName('sib-default-btn');\n                            var countInvisible = 0;\n                            var indexArray = [];\n                            jQuery('.sib-default-btn').each(function (index, el) {\n                                if ((jQuery(el).attr('id') == \"invisible\")) {\n                                    indexArray[countInvisible] = index;\n                                    countInvisible++\n                                }\n                            });\n\n                            jQuery('.invi-recaptcha').each(function (index, el) {\n                                grecaptcha.render(element[indexArray[index]], {\n                                    'sitekey': jQuery(el).attr('data-sitekey'),\n                                    'callback': sibVerifyCallback,\n                                });\n                            });\n                        };\n\t\t\t\t\t<\/script>\n\t\t\t\t\t                <script src=\"https:\/\/www.google.com\/recaptcha\/api.js?onload=onloadSibCallbackInvisible&render=explicit\" async defer><\/script>\n\t\t\t\t\n\t\t\t<form id=\"sib_signup_form_1\" method=\"post\" class=\"sib_signup_form\" action=\"\">\n\t\t\t\t<div class=\"sib_loader\" style=\"display:none;\"><img\n\t\t\t\t\t\t\tsrc=\"https:\/\/www.railscarma.com\/wp-includes\/images\/spinner.gif\" alt=\"lastare\"><\/div>\n\t\t\t\t<input type=\"hidden\" name=\"sib_form_action\" value=\"subscribe_form_submit\">\n\t\t\t\t<input type=\"hidden\" name=\"sib_form_id\" value=\"1\">\n                <input type=\"hidden\" name=\"sib_form_alert_notice\" value=\"Please fill out this field\">\n                <input type=\"hidden\" name=\"sib_form_invalid_email_notice\" value=\"Your email address is invalid\">\n                <input type=\"hidden\" name=\"sib_security\" value=\"d7f7626ab9\">\n\t\t\t\t<div class=\"sib_signup_box_inside_1\">\n\t\t\t\t\t<div style=\"\/*display:none*\/\" class=\"sib_msg_disp\">\n\t\t\t\t\t<\/div>\n                                            <div id=\"sib_captcha_invisible\" class=\"invi-recaptcha\" data-sitekey=\"6LdikOAaAAAAAJ6SWrrKVQrtw7TQpQAEnv0HS0G3\"><\/div>\n                    \t\t\t\t\t<p class=\"sib-email-area\">\r\n    <label class=\"sib-email-area\"><\/label>\r\n    <input type=\"email\" class=\"sib-email-area\" name=\"email\" required=\"required\" placeholder=\"E-postadress\">\r\n<\/p>\r\n<p class=\"sib-NAME-area\">\r\n    <label class=\"sib-NAME-area\"><\/label>\r\n    <input type=\"text\" class=\"sib-NAME-area\" name=\"NAME\" placeholder=\"namn\">\r\n<\/p>\r\n<p>\r\n    <input type=\"submit\" id=\"invisible\" class=\"sib-default-btn\" value=\"Prenumerera\">\r\n<\/p>\t\t\t\t<\/div>\n\t\t\t<input type=\"hidden\" name=\"trp-form-language\" value=\"sv\"\/><\/form>\n\t\t\t<style>\n\t\t\t\tform#sib_signup_form_1 p.sib-alert-message {\n    padding: 6px 12px;\n    margin-bottom: 20px;\n    border: 1px solid transparent;\n    border-radius: 4px;\n    -webkit-box-sizing: border-box;\n    -moz-box-sizing: border-box;\n    box-sizing: border-box;\n}\nform#sib_signup_form_1 p.sib-alert-message-error {\n    background-color: #f2dede;\n    border-color: #ebccd1;\n    color: #a94442;\n}\nform#sib_signup_form_1 p.sib-alert-message-success {\n    background-color: #dff0d8;\n    border-color: #d6e9c6;\n    color: #3c763d;\n}\nform#sib_signup_form_1 p.sib-alert-message-warning {\n    background-color: #fcf8e3;\n    border-color: #faebcc;\n    color: #8a6d3b;\n}\n\t\t\t<\/style>\n\t\t\t<\/div>\n\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<\/div>\n\t\t  <div class=\"related-post slider\">\r\n        <div class=\"headline\">relaterade inl\u00e4gg<\/div>\r\n    <div class=\"post-list owl-carousel\">\r\n\r\n            <div class=\"item\">\r\n            <div class=\"thumb post_thumb\">\r\n    <a  title=\"Kaminari Gem\" 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post_title\"  title=\"Ruby IDE: De b\u00e4sta IDE:erna f\u00f6r Ruby on Rails Development\" href=\"https:\/\/www.railscarma.com\/sv\/blogg\/ror\/ruby-ide-de-basta-ideerna-for-ruby-on-rails-utveckling\/?related_post_from=36125\">\r\n        Ruby IDE: De b\u00e4sta IDE:erna f\u00f6r Ruby on Rails Development  <\/a>\r\n\r\n        <\/div>\r\n      \r\n  <\/div>\r\n\r\n  <script>\r\n      <\/script>\r\n  <style>\r\n    .related-post {}\r\n\r\n    .related-post .post-list {\r\n      text-align: left;\r\n          }\r\n\r\n    .related-post .post-list .item {\r\n      margin: 10px;\r\n      padding: 10px;\r\n          }\r\n\r\n    .related-post .headline {\r\n      font-size: 14px !important;\r\n      color: #999999 !important;\r\n          }\r\n\r\n    .related-post .post-list .item .post_thumb {\r\n      max-height: 220px;\r\n      margin: 10px 0px;\r\n      padding: 0px;\r\n      display: block;\r\n          }\r\n\r\n    .related-post .post-list .item .post_title {\r\n      font-size: 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H\u00e4r \u00e4r d\u00e4r rack middleware kommer in i bilden. Vad \u00e4r Rack Middleware? ...<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/www.railscarma.com\/sv\/blogg\/ruby-regex-match-guide-with-examples\/\"> <span class=\"screen-reader-text\">Ruby Regex Match Guide (2026) med exempel<\/span> L\u00e4s mer \u00bb<\/a><\/p>","protected":false},"author":1,"featured_media":32115,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[385],"tags":[540,591,592,389,381,382,383],"class_list":["post-6489","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-management","tag-agile-rails-development","tag-middleware","tag-middleware-in-rails","tag-rails","tag-rails-developers","tag-ruby-on-rails","tag-ruby-on-rails-development"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Use Rack Middleware in Rails For Auto Completion - 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