Resolve FAL relations and return file records.

Render a single image linked from a TCA record

We assume that the table tx_users has a column photo, which is a FAL relation field configured with [ExtensionManagementUtility::getFileFieldTCAConfig()] (https://docs.typo3.org/typo3cms/TCAReference/Reference/Columns/Inline/Index.html#file-abstraction-layer). The template also has a user variable containing one of the table's records.

At first, fetch the record and store it in a variable. Then use <f:image> to render it:

{v:resource.record.fal(table: 'tx_users', field: 'photo', record: user)
 -> v:iterator.first()
 -> v:variable.set(name: 'image')}
<f:if condition="{image}">
  <f:image treatIdAsReference="1" src="{image.id}" title="{image.title}" alt="{image.alternative}"/>
</f:if>

Use the uid attribute if you don't have a record.