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Translating help topics
The title and body text of help topics provided by contributed modules and themes are translatable using the <a href=":locale_help">Interface Translation module</a>. Topics provided by custom modules and themes are also translatable if they have been viewed at least once in a non-English language, which triggers putting their translatable text into the translation database.
To search help, you will need to install the core Search module, configure a search page, and add a search block to the Help page or another administrative page. (A search page is provided automatically, and if you use the core Claro administrative theme, a help search block is shown on the main Help page.) Then users with search permissions, and permission to view help, will be able to search help. See the <a href=":search_help">Search module help page</a> for more information.
The MySQL module provides the connection between Drupal and a MySQL, MariaDB or equivalent database. For more information, see the <a href=":mysql">online documentation for the MySQL module</a>.
The Field module allows custom data fields to be defined for <em>entity</em> types (see below). The Field module takes care of storing, loading, editing, and rendering field data. Most users will not interact with the Field module directly, but will instead use the <a href=":field-ui-help">Field UI module</a> user interface. Module developers can use the Field API to make new entity types "fieldable" and thus allow fields to be attached to them. For more information, see the <a href=":field">online documentation for the Field module</a>.
Terminology
Entities and entity types
The website's content and configuration is managed using <em>entities</em>, which are grouped into <em>entity types</em>. <em>Content entity types</em> are the entity types for site content (such as the main site content, comments, content blocks, taxonomy terms, and user accounts). <em>Configuration entity types</em> are used to store configuration information for your site, such as individual views in the Views module, and settings for your main site content types.
Entity sub-types
Some content entity types are further grouped into sub-types (for example, you could have article and page content types within the main site content entity type, and tag and category vocabularies within the taxonomy term entity type); other entity types, such as user accounts, do not have sub-types. Programmers use the term <em>bundle</em> for entity sub-types.
Fields and field types
Content entity types and sub-types store most of their text, file, and other information in <em>fields</em>. Fields are grouped by <em>field type</em>; field types define what type of data can be stored in that field, such as text, images, or taxonomy term references.
Formatters and view modes
Content entity types and sub-types can have one or more <em>view modes</em>, used for displaying the entity items. For instance, a content item could be viewed in full content mode on its own page, teaser mode in a list, or RSS mode in a feed. In each view mode, each field can be hidden or displayed, and if it is displayed, you can choose and configure the <em>formatter</em> that is used to display the field. For instance, a long text field can be displayed trimmed or full-length, and taxonomy term reference fields can be displayed in plain text or linked to the taxonomy term page.
Widgets and form modes
Content entity types and sub-types can have one or more <em>form modes</em>, used for editing. For instance, a content item could be edited in a compact format with only some fields editable, or a full format that allows all fields to be edited. In each form mode, each field can be hidden or displayed, and if it is displayed, you can choose and configure the <em>widget</em> that is used to edit the field. For instance, a taxonomy term reference field can be edited using a select list, radio buttons, or an autocomplete widget.
Enabling field types, widgets, and formatters
The Field module provides the infrastructure for fields; the field types, formatters, and widgets are provided by Drupal core or additional modules. Some of the modules are required; the optional modules can be installed from the <a href=":modules">Extend administration page</a>. Additional fields, formatters, and widgets may be provided by contributed modules, which you can find in the <a href=":contrib">contributed module section of Drupal.org</a>.
Field, widget, and formatter information
Provided by modules
Here is a list of the currently installed field, formatter, and widget modules:
Provided by Drupal core
As mentioned previously, some field types, widgets, and formatters are provided by Drupal core. Here are some notes on how to use some of these:
<strong>Entity Reference</strong> fields allow you to create fields that contain links to other entities (such as content items, taxonomy terms, etc.) within the site. This allows you, for example, to include a link to a user within a content item. For more information, see <a href=":er_do">the online documentation for the Entity Reference module</a>.
Managing and displaying entity reference fields
The <em>settings</em> and the <em>display</em> of the entity reference field can be configured separately. See the <a href=":field_ui">Field UI help</a> for more information on how to manage fields and their display.
Selecting reference type
In the field settings you can select which entity type you want to create a reference to.
Filtering and sorting reference fields
Depending on the chosen entity type, additional filtering and sorting options are available for the list of entities that can be referred to, in the field settings. For example, the list of users can be filtered by role and sorted by name or ID.