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Apr 8, 2017
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Add helpful remarks on custom DataCollector #1

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11 changes: 11 additions & 0 deletions profiler/data_collector.rst
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Expand Up @@ -30,6 +30,11 @@ The
:method:`Symfony\\Component\\HttpKernel\\DataCollector\\DataCollectorInterface::collect`
method is responsible for storing the collected data in local properties.

.. caution::

The :method:`Symfony\\Component\\HttpKernel\\DataCollector\\DataCollectorInterface::collect` method is only called once.
It is not used to "gather" data but is there to "pick up" the data that has been stored by your service.

Most of the time, it is convenient to extend
:class:`Symfony\\Component\\HttpKernel\\DataCollector\\DataCollector` and
populate the ``$this->data`` property (it takes care of serializing the
Expand Down Expand Up @@ -71,6 +76,12 @@ collects the method and accepted content types from the request::

The getters are added to give the template access to the collected information.

.. caution::

If the data that is not directly related to the request or response, you need to make the data accessible for your DataCollector.
This can be achieved by injecting the service into your DataCollector.


.. caution::

As the profiler serializes data collector instances, you should not
Expand Down