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[Workflow] Added explaination on context in events and initial marking #14678

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[Workflow] Added explaination on context in events and initial marking #14678

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Added explaination on context in events and initial marking
epitre Jul 9, 2020
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typo
epitre Jul 11, 2020
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Merge branch '5.2' into eventWithContext
epitre Dec 8, 2020
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Update workflow.rst
epitre Dec 8, 2020
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12 changes: 12 additions & 0 deletions components/workflow.rst
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Expand Up @@ -94,6 +94,18 @@ you can retrieve a workflow from it and use it as follows::
$workflow->can($blogPost, 'publish'); // True
$workflow->getEnabledTransitions($blogPost); // $blogPost can perform transition "publish" or "reject"

Initialization
--------------

If the property of your object is null and you want to set it with the `initial_marking` from the configuration, you can call the `getMarking()` method to initialize the object property::

// ...
$blogPost = new BlogPost();
$workflow = $registry->get($blogPost);

// initiate workflow
$workflow->getMarking($blogPost);

Learn more
----------

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23 changes: 23 additions & 0 deletions workflow.rst
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Expand Up @@ -378,11 +378,34 @@ order:
* ``workflow.[workflow name].announce``
* ``workflow.[workflow name].announce.[transition name]``

You can avoid triggering those events by using the context::

$workflow->apply($subject, $transitionName, [Workflow::DISABLE_ANNOUNCE_EVENT => true]);

.. versionadded:: 5.1

The ``Workflow::DISABLE_ANNOUNCE_EVENT`` constant was introduced in Symfony 5.1.

.. versionadded:: 5.2

In Symfony 5.2, the context is accessible in all events::

// $context must be an array
$context = ['context_key' => 'context_value'];
$workflow->apply($subject, $transitionName, $context);

// in an event listener
$context = $event->getContext(); // returns ['context']

.. note::

The leaving and entering events are triggered even for transitions that stay
in same place.

.. note::

If you initialize the marking by calling ``$workflow->getMarking($object);``, then the ``workflow.[workflow name].entered.[initial place name]`` event will be called with a default context ``Workflow::DEFAULT_INITIAL_CONTEXT``.

Here is an example of how to enable logging for every time a "blog_publishing"
workflow leaves a place::

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