{"id":7419,"date":"2015-12-21T11:16:30","date_gmt":"2015-12-21T11:16:30","guid":{"rendered":"https:\/\/dev.railscarma.com\/unlocking-the-devise-gem\/"},"modified":"2026-01-01T06:58:34","modified_gmt":"2026-01-01T06:58:34","slug":"lasa-upp-devise-parla","status":"publish","type":"post","link":"https:\/\/www.railscarma.com\/sv\/blogg\/tekniska-artiklar\/lasa-upp-devise-parla\/","title":{"rendered":"Unlocking the \u2018Devise\u2019 Gem in Rails 8"},"content":{"rendered":"
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If we have to don our wizarding hat and take out our crystal balls, we would still be harping that Ruby on Rails is going to be hot in 2026 too! 2026 is also going to bring in only 24 hours a day (how we wish, we could stretch the time) and time would still spell money for businesspeople. When time is money, anything which can save time is gold! And that\u2019s where Ruby on Rails come in picture. What could take other programming languages months to complete, takes only weeks, sometimes just days for Ruby on Rails. Shaping ideas into applications was never so easy. With Ruby on Rails, agility is the norm and convention over configuration the benchmark. And what make Ruby on Rails more powerful are the bunch of pre-packaged, categorized, reusable codes, named as gems. With gems, Rails is a super power to behold. One of the most popular gems is called as Devise Gems, which is a complete authentication package. Read on to know more about Devise gem.<\/p>\n

Introducing Devise for Ruby on Rails 8<\/b><\/h2>\n

Devise is a widely used authentication library for Ruby on Rails 8 applications, built on top of Warden<\/strong>, a Rack-based authentication framework.<\/p>\n

Warden manages user sessions by securely validating the identity of authenticated users. It also ensures that unauthenticated users are restricted from accessing protected routes and resources within a Rails application.<\/p>\n

Since Warden operates strictly at the Rack level, it does not provide Rails-specific features such as controllers, views, helpers, or configuration generators required for a complete authentication system. Devise bridges this gap by adding these Rails integrations, making it easier to implement a robust and production-ready authentication solution in Rails 8.<\/p>\n

A major advantage of Devise is its modular architecture. It includes around ten authentication modules that allow you to customize how authentication behaves in your application. You can enable only the modules you need\u2014such as Registerable, Omniauthable, Trackable, and others\u2014keeping your authentication setup clean and flexible.<\/p>\n

\u00a0<\/p>\n

With this understanding, we can now begin building our Tasks application and set up Devise in a Rails 8 environment.<\/p>\n

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Vad \u00e4r "Devise" Gem?<\/strong><\/h2>\n

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    \n
  1. Devise \u00e4r en kraftfull och flexibel autentiseringsl\u00f6sning f\u00f6r Rails.<\/li>\n
  2. Det \u00e4r helt baserat p\u00e5 MVC-struktur.<\/li>\n
  3. Det g\u00f6r det m\u00f6jligt att ha flera modeller inloggade samtidigt.<\/li>\n<\/ol>\n

    <\/p>\n

    <\/p>\n

    Olika moduler av Devise<\/strong><\/h2>\n

    <\/p>\n

    <\/p>\n

    Devise best\u00e5r av 10 viktiga moduler.<\/p>\n

    <\/p>\n

    <\/p>\n

      \n
    1. Databasautentiseringsbar: Den krypterar och lagrar l\u00f6senord i databasen s\u00e5 att valideringen kan g\u00f6ras f\u00f6r en anv\u00e4ndares \u00e4kthet vid tidpunkten f\u00f6r inloggningen. Autentiseringen kan g\u00f6ras b\u00e5de genom POST-f\u00f6rfr\u00e5gningar eller HTTP Basic Authentication.<\/li>\n
    2. Omniauthable: L\u00e4gg till\u00a0OmniAuth<\/a>\u00a0support dvs m\u00f6jligt att s\u00e4tta upp en inloggning med OmniAuth.<\/li>\n
    3. Kan bekr\u00e4ftas: Skickar e-postmeddelanden med bekr\u00e4ftelseinstruktioner och verifierar om ett konto redan har bekr\u00e4ftats vid inloggning.<\/li>\n
    4. \u00c5terst\u00e4llningsbar: \u00c5terst\u00e4ller anv\u00e4ndarl\u00f6senordet och skickar \u00e5terst\u00e4llningsinstruktioner.<\/li>\n
    5. Registrerbar: Hanterar registreringsprocessen genom att registrera anv\u00e4ndare, vilket ocks\u00e5 till\u00e5ter dem att redigera och f\u00f6rst\u00f6ra sitt konto.<\/li>\n
    6. Minnesbar: Som namnet antyder hj\u00e4lper den till att hantera, generera och rensa en token f\u00f6r att komma ih\u00e5g anv\u00e4ndaren genom sparade cookies.<\/li>\n
    7. Sp\u00e5rbar: Sp\u00e5rar antalet inloggningar, tidsst\u00e4mplar och IP-adress.<\/li>\n
    8. Timeoutbar<\/a>: F\u00f6rfaller sessioner som inte har varit aktiva under en viss tidsperiod.<\/li>\n
    9. Validerbar: Ger valideringar av e-post och l\u00f6senord. Det \u00e4r valfritt och kan anpassas, s\u00e5 att du kan definiera dina egna valideringar.<\/li>\n
    10. L\u00e5sbar: Det hj\u00e4lper till att l\u00e5sa ett konto efter ett visst antal misslyckade inloggningsf\u00f6rs\u00f6k. Kontot kan l\u00e5sas upp via e-post eller efter en viss tidsperiod.<\/li>\n<\/ol>\n

      <\/p>\n

      <\/p>\n

      Installera Devise, Skapa modell, Visa och konfigurera<\/strong><\/h2>\n

      <\/p>\n

      <\/p>\n

        \n
      1. Skapa din rails-app<\/li>\n
      2. L\u00e4gg till "devise" till din Gemfile.<\/li>\n
      3. K\u00f6r paketinstallation p\u00e5 din kommandorad.<\/li>\n
      4. K\u00f6r rails generera devise:install p\u00e5 din kommandorad.<\/li>\n
      5. Execute rails generate devise <Model Name> in your command line to create model<\/li>\n<\/ol>\n
        \n
        Run the following command:<\/b><\/div>\n
        \u00a0<\/div>\n
        rails generate devise User<\/pre>\n
        After running this command, a user.rb model will be generated in the app\/models directory.<\/div>\n
        \u00a0<\/div>\n
        class User < ApplicationRecord\n  # Include default Devise modules.\n  # Other available modules are:\n  # :confirmable, :lockable, :timeoutable, and :omniauthable
        \u00a0 devise :database_authenticatable,
        \u00a0 \u00a0 \u00a0 \u00a0 \u00a0:registerable,
        \u00a0 \u00a0 \u00a0 \u00a0 \u00a0:recoverable,
        \u00a0 \u00a0 \u00a0 \u00a0 \u00a0:rememberable,
        \u00a0 \u00a0 \u00a0 \u00a0 \u00a0:trackable,
        \u00a0 \u00a0 \u00a0 \u00a0 \u00a0:validatable
        slutet<\/pre>\n<\/div>\n
          \n
        1. Om du vill kan du \u00e4ndra din migreringsfil f\u00f6r anv\u00e4ndare. K\u00f6r sedan rake db:migrate<\/li>\n
        2. K\u00f6r rails generera devise:views p\u00e5 din kommandorad f\u00f6r att skapa vyer<\/li>\n
        3. du m\u00e5ste st\u00e4lla in standard-URL-alternativen f\u00f6r Devise-mailern i varje milj\u00f6. Ex-konfiguration f\u00f6r config\/environments\/development.rb: config.action_mailer.default_url_options = { v\u00e4rd: 'localhost', port: 3000 }<\/li>\n<\/ol>\n
          <\/p>\n
          <\/p>\n
          Du kan anpassa modeller, kontroller och vyer enligt krav. V\u00e4nligen f\u00f6lj github-dokumenten f\u00f6r mer information.<\/p>\n
          <\/p>\n
          <\/p>\n
          Vissa kontrollfilter och hj\u00e4lpare<\/strong><\/h2>\n
          <\/p>\n
          <\/p>\n