[TASK] Remove outdated TCA type user dbType json (#900)

This was removed in favor of a dedicated TCA type `json`.

Releases: main, 12.4

Documentation/ColumnsConfig/Type/User/Index.rst

@@ -126,70 +126,6 @@ This example is also described in TYPO3 Explained,
 Properties
 ==========
 
-..  _columns-user-properties-dbType:
-
-dbType
-------
-
-..  versionadded:: 12.2
-    The dbType `json` was introduced to allow storage and usage of JSON data.
-
-..  confval:: dbType (type => user)
-
-    :Path: $GLOBALS['TCA'][$table]['columns'][$field]['config']['dbType']
-    :type: string
-    :Scope: Proc
-
-    `json`
-        When the property dbType is set to `json`, the form engine
-        provides the decoded JSON to the RecordProviders and the `user`
-        PHP implementation (extending :php:`TYPO3\CMS\Backend\Form\Element\AbstractFormElement`)
-        can then use the field value.
-
-        ..  note:: In the frontend and in custom backend implementations the
-            implementing code still **must** decode the string into a PHP array:
-
-            If :ref:`Connection->insert() <t3coreapi:database-connection-insert>`
-            or :ref:`Connection->update()  <t3coreapi:database-connection-update>` are
-            used, and not specified types handed over, the database scheme is
-            used and the native format for JSON fields data will then encoded.
-
-            This does not work for :ref:`QueryBuilder <t3coreapi:database-query-builder>`.
-            Same goes for Extbase, which is not decoding this field type yet
-            but retrieving it as a string.
-
-dbType = json example
-~~~~~~~~~~~~~~~~~~~~~
-
-The system extension :t3ext:`reactions` uses a TCA field of type `user` with
-the dbType `json`:
-
-..  code-block:: php
-    :caption: :t3src:`reactions/Configuration/TCA/Overrides/sys_reaction_create_record.php` (excerpt)
-
-    <?php
-
-    \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addTCAcolumns(
-        'sys_reaction',
-        [
-            // ...
-            'fields' => [
-                'label' => 'LLL:EXT:reactions/Resources/Private/Language/locallang_db.xlf:sys_reaction.fields',
-                'config' => [
-                    'type' => 'user',
-                    'renderType' => 'fieldMap',
-                    'dbType' => 'json',
-                    'default' => '{}',
-                ],
-            ],
-        ]
-    );
-
-The implementing class receives the parsed JSON as PHP array:
-
-..  literalinclude:: _includes/_FieldMapElement.php
-    :caption: :t3src:`reactions/Classes/Form/Element/FieldMapElement.php` (excerpt)
-
 ..  _columns-user-properties-renderType:
 
 renderType