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Excluding from nested models
----------------------------
The ``exclude`` option can be used to exclude fields from models that are related to our data model by using dotted
paths. For example, ``exclude={"a.b"}`` would exclude the ``b`` attribute of an instance nested on the ``a`` attribute.
To demonstrate, let's adjust our script to add an ``Address`` model, that is related to the ``Person`` model:
.. literalinclude:: /examples/data_transfer_objects/factory/tutorial/nested_exclude.py
:language: python
:linenos:
:emphasize-lines: 9-13,21,25,32,33
The ``Address`` model has three attributes, ``street``, ``city``, and ``country``, and we've added an ``address``
attribute to the ``Person`` model.
The ``ReadDTO`` class has been updated to exclude the ``street`` attribute of the nested ``Address`` model using the
dotted path syntax ``"address.street"``.
Inside the handler, we create an ``Address`` instance and assign it to the ``address`` attribute of the ``Person``.
When we call our handler, we can see that the ``street`` attribute is not included in the response:
.. image:: images/nested_exclude.png
:align: center
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