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Version: 2.x

Updating For 2.0

Flarum 2.0 is a major release that includes a number of breaking changes and new features. This guide will help you update your extension to be compatible with Flarum 2.0 and take advantage of the new additions.

tip

If you need help applying these changes or using new features, please start a discussion on the community forum or Discord chat.

info

You can use the Flarum CLI to automate as much of the upgrade steps as possible:

flarum-cli upgrade 2.0

Frontend​

Mithril 2.2​

Breaking​
  • Flarum 2.0 upgrades Mithril to version 2.2. This version introduces one breaking change that may affect your extension. Mithril no longer sets a text attribute on vnodes, instead it uses a child with the tag #. So to extract text from a vnode, use the extractText() utility instead.

Export Registry​

2.0 introduces a new concept called the Export Registry. This is a central place where exports from core and extensions are automatically registered. This allows extensions to easily extend modules from other extensions without those extensions needing to explicitly support it. This also allows lazy loading of modules, which can improve performance.

Compat API​

Breaking​

Importing Modules​

Breaking​

  • Importing from extensions must now be done using a ext: prefix. This means that any imports you are currently making from bundled extensions will need to be updated. For example, flarum/tags/common/models/Tag becomes ext:flarum/tags/common/models/Tag. This also means you can import from any other extension, not just bundled ones, using the same syntax of ext:vendor/extension/common/....

    // Before
    import Tag from 'flarum/tags/common/models/Tag';

    // After
    import Tag from 'ext:flarum/tags/common/models/Tag';

  • Importing from @flarum/core no longer works. It was previously only allowed for the compat API.

  • The useExtensions webpack option has been removed, use the import format explained above to import using the export registry instead.

  • Some flarum modules are now lazy loaded, such as LogInModal. You have to make sure they have been loaded before using them, or you can trigger the loading yourself. See the Code Splitting documentation for more information.

info

Read more about the export registry and how to use it in the Export Registry documentation.

tip

Familiarize yourself with the new Code Splitting feature to lazy load modules and improve overall performance.

Breaking​
  • app.extensionData has been renamed to app.registry, but you should now use the Admin extender instead.
Notable​
  • The admin dashboard now has a search feature, as long as you register your settings/permissions using the Admin extender, then they will be automatically picked up.
  • If your settings/permissions are too custom to be added through the Admin.setting and Admin.permission extenders, then you can use Admin.generalIndexItems to add custom search index entries.

Locale​

Breaking​

  • HTML tags used within translations must be simple tags, without attributes. For example, if you have a locale with the value:

    my_locale_key: "You can read about a <a href='{basic_impl_link}'>basic queue</a> implementation or a <a href='{adv_impl_link}'>more advanced</a> one."

    You must change this to:

    my_locale_key: "You can read about a <basic_impl_link>basic queue</basic_impl_link> implementation or a <adv_impl_link>more advanced</adv_impl_link> one."

    With the following code in your JavaScript:

    app.translator.trans('acme.my_locale_key', {
      basic_impl_link: <a href="https://discuss.flarum.org/d/28151-database-queue-the-simplest-queue-even-for-shared-hosting" />,
      adv_impl_link: <a href="https://discuss.flarum.org/d/21873-redis-sessions-cache-queues" />,
    })

  • Tags used within translations such as <strong> were previously auto provided as parameters

Miscellaneous​

There have been many changes to the core frontend codebase, including renamed or moved methods/components, new methods/components, and more. It might help to look directly at the JavaScript diffs to see what has changed. But here are some notable changes.

Breaking​
  • Some extension initializers have been renamed to be more uniform, if you are checking for initializer existence with app.initializers.has('...') you should update the name accordingly.
  • IndexPage.prototype.sidebar has been removed, use the IndexSidebar component instead.
  • IndexPage.prototype.navItems has been moved to IndexSidebar.prototype.navItems.
  • IndexPage.prototype.sidebarItems has been moved to IndexSidebar.prototype.items.
  • IndexPage.prototype.currentTag has been moved to app.currentTag.
  • The UploadImageButton component has been refactored to allow using it in different contexts. An admin setting definition has also been added to allow you to use an upload setting directly. Additionally, the component has been moved to the common namespace.
  • The FieldSet component has been refactored.
  • The avatar and icon helpers have been refactored to new Avatar and Icon components. Which now allows you to extend them to modify their behavior.
  • The Modal component has been split into Modal and FormModal. The Modal component is now a simple modal that can be used for any content, while the FormModal component is a modal that is specifically designed for forms.
  • app.extensionData has been removed. You must now use the Admin extender to register settings, permissions and custom extension pages.
Notable​
  • All forum pages now use the same page structure through the new PageStructure component. You should use this component in your extension if you are creating a new forum page.
  • A HeaderDropdown component has been added which is used for the NotificationsDropdown and FlagsDropdown your component should extend that instead of the NotificationsDropdown. Along with it has been also added the following components: HeaderList and HeaderListItem.
  • A DetailedDropdownItem has been added. Checkout the SubsriptionsDropdown component to see how it is used.
  • A Notices component has been added that allows you to easily add global alerts above the hero.
  • A Footer component has been added that allows you to easily add content to the footer.
  • A Form component has been added to ensure consistent styling across forms. You should use this component in your extension if you are creating a form.
  • An API for frontend gambits has been introduced, checkout the full documentation.
  • A FormGroup component has been added that allows you to add any supported type of input similar to the admin panel's settings registration. checkout the documentation for more details.

Backend​

PHP 8.2​

Breaking​
  • The entire codebase has been updated to use/require PHP 8.2 as a minimum, and with it come more strict types. This is not a breaking change for most extensions. But you should still update your extension's code accordingly and check for any potential issues or deprecated code.
Notable​
  • A new Flarum\Locale\TranslatorInterface has been introduced, it is recommended to use instead of either Illuminate\Contracts\Translation\Translator or Symfony\Contracts\Translation\TranslatorInterface.

Dependencies​

Carbon 3​

Breaking​
  • Flarum 2.0 upgrades Carbon to version 3. diffIn methods now return floats instead of integers and can return negative values to indicate time direction. This is the most significant breaking change in Carbon 3. If you are using any of these methods, you should update your code to handle floats and negative values.

Other changes can be found in the Carbon 3 change log.

Symfony (updated from 5.x to 7.x)​

Notable​
  • Flarum 2.0 upgrades Symfony components to version 6. Most extensions will not need to make any changes.

Laravel (updated from 8.x to 11.x)​

Flarum 2.0 uses Laravel 11 components, depending on your extension you may need to adapt your code. Here are some notable highlights.

Breaking​
  • The $dates property on models has been removed. You should now use the $casts property instead as such:
    protected $casts = [
        'example_at' => 'datetime',
    ];
  • When changing columns in migrations, you must always include the entirety of the column definition. For example, if you are changing a nullable column from string to text, you must include the ->nullable() method in the new column definition. You will have to update your migrations accordingly. (https://laravel.com/docs/11.x/upgrade#modifying-columns)

For more details, see the Laravel 9, Laravel 10 and Laravel 11 upgrade guides.

Flysystem (updated from 1.x to 3.x)​

Flarum 2.0 upgrades Flysystem to version 3. Most extensions will not need to make any changes, unless you are using/declaring a Flysystem adapter.

Breaking​

  • The NullAdapter has been removed. You may instead use the InMemoryFilesystemAdapter.

  • The Local adapter has been removed. You should use the LocalFilesystemAdapter instead.

  • The FilesystemAdapter constructor now takes as a second argument the adapter instance, if you are using the Flarum filesystem driver interface you don't need to make any changes. If you are using Flysystem directly, you will need to pass the adapter instance as a second argument.

    // Before
    new FilesystemAdapter(new Filesystem(new LocalAdapter($path)));

    // After
    $adapter = new LocalFilesystemAdapter($path);
    new FilesystemAdapter(new Filesystem($adapter), $adapter);

  • Some filesystem methods have been renamed and others have been removed.

For more details, read the Flysystem 1.x to V2 & V3 upgrade guide. Additionally, you can see the Flysystem V2 & V3 new features.

Swift Mailer has been replaced with Symfony Mailer​

Breaking​
  • If your extension defines a new mail driver, you will need to update your code to use the new Symfony Mailer API.

Checkout the Symfony Mailer documentation for more details.

JSON:API​

Flarum 2.0 completely refactors the JSON:API implementation. The way resource CRUD operations, serialization and extending other resources is done has completely changed.

Breaking​
  • The AbstractSerializeController, AbstractShowController, AbstractCreateController, AbstractUpdateController, and AbstractDeleteController have been removed.
  • The AbstractSerializer has been removed.
  • The ApiController and ApiSerializer extenders have been removed.
  • The Saving are dispatched after the validation process instead of before.
  • The various validators have been removed. This includes the DiscussionValidator, PostValidator, TagValidator, SuspendValidator, GroupValidator, UserValidator.
  • Many command handlers have been removed. Use the JsonApi class if you wish to execute logic from an existing endpoint internally instead.
  • The flarum.forum.discussions.sortmap singleton has been removed. Instead, you can define an ascendingAlias and descendingAlias on your added SortColumn sorts.
  • The show discussion endpoint no longer includes the posts relationship, so any posts.* relation includes or eager loads added to that endpoint must be removed.

Replacing the deleted classes is the new AbstractResource and AbstractDatabaseResource classes. We recommend looking at a comparison between the bundled extensions (like tags) from 1.x to 2.x to have a better understanding of the changes:

Refer to the documentation

Read about the full extent of the new introduced implementation and its usage in the JSON:API section.

Notable​
  • We now do not recommend adding default includes to endpoints. Instead it is preferable to add what relations you need included in the payloads of individual requests. This improves the performance of the forum.

Search/Filter system​

The search system has been refactored to allow for more flexibility and extensibility, and to further simplify things, the separate concept of filtering has been removed.

Breaking​
  • The old system decided between using the model filterer and the model searcher based on whether a search query filter[q] was provided. The new system does not have filterers anymore, but the distinction is still present, the only difference is that the default database search driver is always used when no search query is provided.
  • If you have a class extending AbstractFilterer (a filterer) you should now extend AbstractSearcher instead (a searcher). If you already have a searcher for the same model, you can remove the filterer. Filters can be assigned to the searcher class.
  • Gambits have been removed from the backend. There are only filters now per model searcher. The concept of gambits has been moved to the frontend instead. See the search documentation gambits section for more details.
  • Some namespaces have been changed or removed. The classes within Flarum\Query have been moved to Flarum\Search. The classes within Flarum\Filter have been moved to Flarum\Search\Filter. The FilterState class has been removed, you should use the SearchState class instead.
  • The database search state now returns an Eloquent query builder instead of a database query builder.
Notable​
  • A new search driver API has been introduced. Checkout the search documentation for more details on how to use it.
  • You can now get the total search result count from SearchResults.
  • You can now replace an existing filter implementation.

SQLite/PostgreSQL​

Notable​
  • Flarum 2.0 introduces support for SQLite and PostgreSQL databases. If your extension uses any database-specific queries, you should ensure they are compatible with these databases.
  • You can use the new whenMysql, whenSqlite, and whenPgsql methods on the query builder to run database-specific queries.
  • You should ensure your extension is explicit about whether it supports SQLite and PostgreSQL. You can use the database-support key in your composer.json to specify this.
tip

Checkout the database documentation for more details.

LESS Preprocessing​

Breaking​
  • The LESS code has been refactored to use more vanilla CSS instead of LESS conditionals and variables.

    • The dark mode switch has been refactored to a color scheme setting that takes effect purely through CSS variables. You should away from using LESS variables as much as possible and instead use the equivalent CSS variables. To add more color schemes.

    • The @config-dark-mode and @config-colored-header variables have been removed. Instead, you can use the [data-theme^=dark] and [data-colored-header=true] CSS selectors respectively.

      // before
      & when (@config-dark-mode) {
        background: black;
      }

      // after
      [data-theme^=dark] & {
        background: black;
      }
Notable​
  • New high contrast color schemes have been added.
  • You can register more color schemes through the new frontend Theme extender and equivalent CSS code [data-theme=your-scheme].

Email Notifications​

Breaking​
  • The getEmailView method of the Flarum\Notification\MailableInterface interface has been renamed to getEmailViews
  • getEmailViews now requires you to return both text and html views for your email notification.
tip

Checkout this example from the mentions extension:

Miscellaneous​

Breaking​
  • The (Extend\Notification)->type() extender no longer accepts a serializer as second argument.
  • Notification Blueprints must now implement the Flarum\Notification\AlertableInterface interface in order them to be sent as alerts. This allows for email-only notifications for example.
  • The staudenmeir/eloquent-eager-limit package has been removed. If you are using the Staudenmeir\EloquentEagerLimit\HasEagerLimit trait in any of your models, you can simply remove it as it is native to Laravel now.

Notable​

  • The Frontend extender now allows passing extra attributes and classes that will be added to the root html tag, through the extraDocumentAttributes and extraDocumentClasses methods.
  • When preparing data in tests, you should use the model class name instead of the table name, this will ensure the factory of the model is used and basic data is autofilled for you.

Infrastructure​

Reusable GitHub Workflows​

Breaking​
  • The reusable GitHub workflows must be updated to use target the ones from the 2.x branch. For example, you must change flarum/framework/.github/workflows/REUSABLE_backend.yml@main to flarum/framework/.github/workflows/[email protected].