The table also shows the number of Interface classes and Traits in the Subsystem along with a link to further Drupal documentation as applicable. Route access control. Ajax is the process of dynamically updating parts of a page's HTML based on data from the server.
When a specified event takes place, a PHP callback is triggered, which performs server-side logic and may return updated markup or JavaScript commands to run. After the return, the browser runs the JavaScript or updates the markup on the fly, with no full page refresh necessary. Building on the Annotation Component , this provides annotations for class discovery and metadata description.
The Drupal plugin system has a set of reusable components that developers can use, override, and extend in their modules. Most of the plugins use annotations, which let classes register themselves as plugins and describe their metadata. Annotations can also be used for other purposes, though at the moment, Drupal only uses them for the plugin system. Batch functions allow forms processing to be spread out over several page requests, thus ensuring that the processing does not get interrupted because of a PHP timeout, while allowing the user to receive feedback on the progress of the ongoing operations.
The Cache API is used to store data that takes a long time to compute. Caching can either be permanent or valid only for a certain timespan, and the cache can contain any type of data. Wrappers for console command component for various commands, including database dump, database import, generate proxy, install Drupal site, quick start to run a Drupal web server, and the running of a PHP web server. The configuration API provides a central place for modules to store configuration data.
This data can be simple configuration like your site name, or more complex information managed with configuration entities, such as views and content types. Configuration is a place to store information that you would want to synchronize from development to production. This information is often created during site-building and is not typically generated by regular users during normal site operation. Base classes for thin controllers, form controllers, and a title resolver interface for generating the title from a given route.
Drupal's database abstraction layer provides a unified database query API that can query different underlying databases. Besides providing a unified API for database queries, the database abstraction layer also provides a structured way to construct complex queries, and it protects the database by using good security practices.
Building on the Datetime Component , this provides base classes for date list and datetime elements, date format entity, timestamp widget plugin, date formatter, and formatted date diff.
Building on the Dependency Injection Component , this provides classes for compiler handling of dependency injection. It also has classes for dependency injection for containers, serialization, YAML files, and service providers. Building on the Diff Component , this provides a Diff Formatter class. Entity types in core come in two variants - Configuration Entity and Content Entity. Building on Symfony's and Drupal's EventDispathcher Component, this manages and validates subscribed events.
Base classes for managing Drupal extensions like modules and themes. Also some helper classes like parsers for info files. Extensive base classes, interfaces, and plugins for different types of fields and for their formatting. Numerous exception classes and some factory, helper, and bridge classes for managing HTTP requests.
An image toolkit provides common image file manipulations like scaling, cropping, and rotating. Provides base classes, interfaces, and management classes. Installation classes for services, route builders, module extensions, theme extensions, and a kernel installer for handling Drupal installations.
The association of a path with a controller, coupled with parameter upcasting and access checking, is handled in the routing system. This system serves as a basis for path access on a Drupal site.
The Drupal menu system is a collection of different APIs for menu items defined by modules as well as local tasks, actions and contextual links. Responsible for converting a path parameter to the object it represents.
The Drupal Plugin API allows a module or subsystem to provide functionality plugin instances in an object-oriented way.
Plugins that perform similar functionality are of the same plugin type. Module developers write plugins to extend various systems like blocks, field widgets, and image effects and add new options for administrators to choose from.
Class to extend the proxy builder component by using the DependencySerializationTrait. Proxy classes for numerous different functionalities including batch storage, module install, database lock, bare HTML page render, and route builder.
Implements a queue type of data structure for Drupal that includes a queue factory and classes for garbage collection, database factory queue, queue in memory, and batches. Based on Symfony's routing classes, this processes outbound routes for priority and other considerations.
A route is a path which is defined for Drupal to return some sort of content on. For example, the default front page is a route. When Drupal receives a request, it tries to match the requested path to a route it knows about. If the route is found, then the route's definition is used to return content. Otherwise, Drupal returns a Drupal 8's routing system is heavily based on Symfony's. Drupal's routing system can do everything Symfony's can and more , and both use the same syntax to define routes.
The State API is simple system for the storage of information about the system's state. The information is stored in the database and will be lost when the database is dropped or the site is re-installed from configuration. For storing data which needs to be edited by humans or needs to be shared between environments use the Configuration API. When you include text in code, and the text will be displayed in the Drupal user interface, it needs to be internationalized prepared properly so that it can be localized translated , so that users can make Drupal sites that are completely displayed in different languages.
In Drupal, all interface text must use English as its default language. Also, the project uses automatic mechanisms to extract translatable text strings from the code base, so that translation teams can use Drupal translations to translate the text of Drupal Core and contributed projects. Handles template files by managing twig storage, extensions, environment and policies as well as attributes in the template files.
PHP is a very loosely typed language. The Typed Data API provides developers a consistent way of interacting with data and also provides means of fetching metadata about the actual data.
Various utility classes, including for link generation, error processing, table sorting, theme registry, token and URL assembly. Entity validation is a separate Entity validation API that is decoupled from form validation.
Decoupling entity validation from forms allows validation entities to be independent of form submissions, such as when changed via the RESTful web service.
The validation API implementation is based on the Symfony validator. Weight is for the order for a set of terms that have the same or no parent. Finding out the position in the hierarchy via parents and children seams to be the right way. But the functions loadParents and loadChildren are not giving me the ID s , in fact there loading the Objects link. So the misapply of weights seamed to be the more performant way.
Sadly there aren't functions like hasChildren. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.
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Therefore you will need this structure:. If this does not work, another option would be to edit the composer. If any of the following files or folders exist in your installation, delete them. Note however that you may want to save the composer. Go here , click 'clone or download' and download the.
This next step is optional, however it will make for a more secure system. First, the following directories need to be created if they don't already exist:. The first folder is where exports of the Drupal 8 configuration system will be exported to. The second folder is the private files folder. Creating both of these directories as siblings to the webroot adds security, as the files are not in a web-accessible location. The next thing to do is tell the system of the location of these files.
This is done by declaring the folder paths in settings. You can do this by adding the following two lines to the bottom of settings. After this, clear the registry drush cr;.
You can confirm that the configuration directory was properly set by running drush cex sync , and then checking that there are. The final step is to set up Composer to manage Drupal profiles, modules and themes to be managed by Composer. The Drupal Composer Template tracks Core by default, but needs to be informed of the rest of your code.
At this point, your system should be converted to the Drupal Composer Template, with contributed code being managed by Composer. This article looks at converting exiting Drupal 8 sites to being managed by the Drupal Composer Template.
Doing this can potentially be automated using the Composerize Composer plugin or the Composerize Drupal module. In situations where this does not work, the manual directions in this article can be used as an alternative. In the next and final part of this series, we'll look at how Drupal developers can integrate 3rd party libraries into their custom Drupal profiles, modules and themes. We would love to hear about your project and what you have in mind.
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