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[Spec] EZP-27417: Proposed spec on content object translations removal (

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alongosz authored and andrerom committed Jun 20, 2017
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# Removal of Content Object Translations

## Removing the specific language translation from all the Content Object Versions

For the cases of system maintenance involving e.g. removing a language, PHP API introduces
the `removeTranslation` method on `ContentService` which removes the specific translation from all
the existing Versions of a Content Object and is specified as:

* Remove Content Object translation from all Versions (including archived ones) of a Content Object.
* NOTE: this operation is risky and permanent, so user interface (ideally CLI) should provide
* a warning before performing it.
* @throws \eZ\Publish\API\Repository\Exceptions\BadStateException if the specified translation
* is the only one Content Object has.
* @throws \eZ\Publish\API\Repository\Exceptions\UnauthorizedException if the user is not allowed
* to delete the content (in one of the locations of the given Content Object).
* @throws \eZ\Publish\API\Repository\Exceptions\InvalidArgumentException if languageCode argument
* is invalid for the given content.
* @param \eZ\Publish\API\Repository\Values\Content\ContentInfo $contentInfo
* @param string $languageCode
public function removeTranslation(ContentInfo $contentInfo, $languageCode);

As noted in the method doc, this operation is permanent, so user should be warned about that.
Since it is designed for maintenance tasks and might be a long-running operation, it should be used
by a console command, not the web interface.

The `removeTranslation` method and emits the `RemoveTranslationSignal` defined as:

namespace eZ\Publish\Core\SignalSlot\Signal\ContentService;
use eZ\Publish\Core\SignalSlot\Signal;
* RemoveTranslationSignal emitted when a Content Object translation gets removed from all Versions.
class RemoveTranslationSignal extends Signal
* Content ID.
* @var int
public $contentId;
* Language Code of the removed translation.
* @var string
public $languageCode;

**NOTE:** Search engine reindexing and HttpCache refreshing **have to be done manually** after
performing this operation, until SearchEngine and HttpCache have been gotten support for
the corresponding `RemoveTranslationSignal`.

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