[docs] Restructured Documentation

Restructured the documentation in a way that allows it to
be included in the Unified Documentation of OpenWISP.

For more information see openwisp/openwisp-docs#107.

---------

Co-authored-by: Federico Capoano <f.capoano@openwisp.io>

docs/developer/extending.rst

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+Extending openwisp-notifications
+================================
+
+.. include:: ../partials/developer-docs.rst
+
+One of the core values of the OpenWISP project is :ref:`Software
+Reusability <values_software_reusability>`, for this reason OpenWISP
+Notifications provides a set of base classes which can be imported,
+extended and reused to create derivative apps.
+
+In order to implement your custom version of *openwisp-notifications*, you
+need to perform the steps described in the rest of this section.
+
+When in doubt, the code in `test project
+<https://github.com/openwisp/openwisp-notifications/tree/master/tests/openwisp2/>`_
+and `sample_notifications
+<https://github.com/openwisp/openwisp-notifications/tree/master/tests/openwisp2/sample_notifications/>`_
+will guide you in the correct direction: just replicate and adapt that
+code to get a basic derivative of *openwisp-notifications* working.
+
+.. important::
+
+    If you plan on using a customized version of this module, we suggest
+    to start with it since the beginning, because migrating your data from
+    the default module to your extended version may be time consuming.
+
+.. contents:: **Table of Contents**:
+    :depth: 2
+    :local:
+
+1. Initialize your custom module
+--------------------------------
+
+The first thing you need to do in order to extend *openwisp-notifications*
+is create a new django app which will contain your custom version of that
+*openwisp-notifications* app.
+
+A django app is nothing more than a `python package
+<https://docs.python.org/3/tutorial/modules.html#packages>`_ (a directory
+of python scripts), in the following examples we'll call this django app
+as ``mynotifications`` but you can name it how you want:
+
+.. code-block:: shell
+
+    django-admin startapp mynotifications
+
+Keep in mind that the command mentioned above must be called from a
+directory which is available in your `PYTHON_PATH
+<https://docs.python.org/3/using/cmdline.html#envvar-PYTHONPATH>`_ so that
+you can then import the result into your project.
+
+Now you need to add ``mynotifications`` to ``INSTALLED_APPS`` in your
+``settings.py``, ensuring also that ``openwisp_notifications`` has been
+removed:
+
+.. code-block:: python
+
+    INSTALLED_APPS = [
+        # ... other apps ...
+        # 'openwisp_notifications',        <-- comment out or delete this line
+        "mynotifications",
+    ]
+
+For more information about how to work with django projects and django
+apps, please refer to the `django documentation
+<https://docs.djangoproject.com/en/4.2/intro/tutorial01/>`_.
+
+2. Install ``openwisp-notifications``
+-------------------------------------
+
+Install (and add to the requirement of your project)
+*openwisp-notifications*:
+
+.. code-block:: shell
+
+    pip install -U https://github.com/openwisp/openwisp-notifications/tarball/master
+
+3. Add ``EXTENDED_APPS``
+------------------------
+
+Add the following to your ``settings.py``:
+
+.. code-block:: python
+
+    EXTENDED_APPS = ["openwisp_notifications"]
+
+4. Add ``openwisp_utils.staticfiles.DependencyFinder``
+------------------------------------------------------
+
+Add ``openwisp_utils.staticfiles.DependencyFinder`` to
+``STATICFILES_FINDERS`` in your ``settings.py``:
+
+.. code-block:: python
+
+    STATICFILES_FINDERS = [
+        "django.contrib.staticfiles.finders.FileSystemFinder",
+        "django.contrib.staticfiles.finders.AppDirectoriesFinder",
+        "openwisp_utils.staticfiles.DependencyFinder",
+    ]
+
+5. Add ``openwisp_utils.loaders.DependencyLoader``
+--------------------------------------------------
+
+Add ``openwisp_utils.loaders.DependencyLoader`` to ``TEMPLATES`` in your
+``settings.py``:
+
+.. code-block:: python
+
+    TEMPLATES = [
+        {
+            "BACKEND": "django.template.backends.django.DjangoTemplates",
+            "OPTIONS": {
+                "loaders": [
+                    "django.template.loaders.filesystem.Loader",
+                    "django.template.loaders.app_directories.Loader",
+                    "openwisp_utils.loaders.DependencyLoader",
+                ],
+                "context_processors": [
+                    "django.template.context_processors.debug",
+                    "django.template.context_processors.request",
+                    "django.contrib.auth.context_processors.auth",
+                    "django.contrib.messages.context_processors.messages",
+                ],
+            },
+        }
+    ]
+
+6. Inherit the AppConfig class
+------------------------------
+
+Please refer to the following files in the sample app of the test project:
+
+- `sample_notifications/__init__.py
+  <https://github.com/openwisp/openwisp-notifications/blob/master/tests/openwisp2/sample_notifications/__init__.py>`_.
+- `sample_notifications/apps.py
+  <https://github.com/openwisp/openwisp-notifications/blob/master/tests/openwisp2/sample_notifications/apps.py>`_.
+
+For more information regarding the concept of ``AppConfig`` please refer
+to the `"Applications" section in the django documentation
+<https://docs.djangoproject.com/en/4.2/ref/applications/>`_.
+
+7. Create your custom models
+----------------------------
+
+For the purpose of showing an example, we added a simple "details" field
+to the `models of the sample app in the test project
+<https://github.com/openwisp/openwisp-notifications/blob/master/tests/openwisp2/sample_notifications/models.py>`_.
+
+You can add fields in a similar way in your ``models.py`` file.
+
+**Note**: For doubts regarding how to use, extend or develop models please
+refer to the `"Models" section in the django documentation
+<https://docs.djangoproject.com/en/4.2/topics/db/models/>`_.
+
+8. Add swapper configurations
+-----------------------------
+
+Add the following to your ``settings.py``:
+
+.. code-block:: python
+
+    # Setting models for swapper module
+    OPENWISP_NOTIFICATIONS_NOTIFICATION_MODEL = "mynotifications.Notification"
+    OPENWISP_NOTIFICATIONS_NOTIFICATIONSETTING_MODEL = (
+        "mynotifications.NotificationSetting"
+    )
+    OPENWISP_NOTIFICATIONS_IGNOREOBJECTNOTIFICATION_MODEL = (
+        "mynotifications.IgnoreObjectNotification"
+    )
+
+9. Create database migrations
+-----------------------------
+
+Create and apply database migrations:
+
+.. code-block::
+
+    ./manage.py makemigrations
+    ./manage.py migrate
+
+For more information, refer to the `"Migrations" section in the django
+documentation
+<https://docs.djangoproject.com/en/4.2/topics/migrations/>`_.
+
+10. Create your custom admin
+----------------------------
+
+Refer to the `admin.py file of the sample app
+<https://github.com/openwisp/openwisp-notifications/tests/openwisp2/sample_firmware_upgrader/admin.py>`_.
+
+To introduce changes to the admin, you can do it in two main ways which
+are described below.
+
+**Note**: For more information regarding how the django admin works, or
+how it can be customized, please refer to `"The django admin site" section
+in the django documentation
+<https://docs.djangoproject.com/en/4.2/ref/contrib/admin/>`_.
+
+1. Monkey patching
+~~~~~~~~~~~~~~~~~~
+
+If the changes you need to add are relatively small, you can resort to
+monkey patching.
+
+For example:
+
+.. code-block:: python
+
+    from openwisp_notifications.admin import NotificationSettingInline
+
+    NotificationSettingInline.list_display.insert(1, "my_custom_field")
+    NotificationSettingInline.ordering = ["-my_custom_field"]
+
+2. Inheriting admin classes
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+If you need to introduce significant changes and/or you don't want to
+resort to monkey patching, you can proceed as follows:
+
+.. code-block:: python
+
+    from django.contrib import admin
+    from openwisp_notifications.admin import (
+        NotificationSettingInline as BaseNotificationSettingInline,
+    )
+    from openwisp_notifications.swapper import load_model
+
+    NotificationSetting = load_model("NotificationSetting")
+
+    admin.site.unregister(NotificationSettingAdmin)
+    admin.site.unregister(NotificationSettingInline)
+
+
+    @admin.register(NotificationSetting)
+    class NotificationSettingInline(BaseNotificationSettingInline):
+        # add your changes here
+        pass
+
+11. Create root URL configuration
+---------------------------------
+
+Please refer to the `urls.py
+<https://github.com/openwisp/openwisp-notifications/blob/master/tests/openwisp2/urls.py>`_
+file in the test project.
+
+For more information about URL configuration in django, please refer to
+the `"URL dispatcher" section in the django documentation
+<https://docs.djangoproject.com/en/4.2/topics/http/urls/>`_.
+
+12. Create root routing configuration
+-------------------------------------
+
+Please refer to the `routing.py
+<https://github.com/openwisp/openwisp-notifications/blob/master/tests/openwisp2/routing.py>`_
+file in the test project.
+
+For more information about URL configuration in django, please refer to
+the `"Routing" section in the Channels documentation
+<https://channels.readthedocs.io/en/latest/topics/routing.html>`_.
+
+13. Create celery.py
+--------------------
+
+Please refer to the `celery.py
+<https://github.com/openwisp/openwisp-notifications/blob/master/tests/openwisp2/celery.py>`_
+file in the test project.
+
+For more information about the usage of celery in django, please refer to
+the `"First steps with Django" section in the celery documentation
+<https://docs.celeryproject.org/en/master/django/first-steps-with-django.html>`_.
+
+14. Import Celery Tasks
+-----------------------
+
+Add the following in your settings.py to import celery tasks from
+``openwisp_notifications`` app.
+
+.. code-block:: python
+
+    CELERY_IMPORTS = ("openwisp_notifications.tasks",)
+
+15. Register Template Tags
+--------------------------
+
+If you need to use template tags of *openwisp_notifications*, you will
+need to register as shown in `"templatetags/notification_tags.py" of
+sample_notifications
+<https://github.com/openwisp/openwisp-notifications/blob/master/tests/openwisp2/sample_notifications/templatetags/notification_tags.py>`_.
+
+For more information about template tags in django, please refer to the
+`"Custom template tags and filters" section in the django documentation
+<https://docs.djangoproject.com/en/4.2/topics/http/urls/>`_.
+
+16. Register Notification Types
+-------------------------------
+
+You can register notification types as shown in the :ref:`section for
+registering notification types <notifications_register_type>`.
+
+A reference for registering a notification type is also provided in
+`sample_notifications/apps.py
+<https://github.com/openwisp/openwisp-notifications/blob/master/tests/openwisp2/sample_notifications/apps.py>`_.
+The registered notification type of ``sample_notifications`` app is used
+for creating notifications when an object of ``TestApp`` model is created.
+You can use `sample_notifications/models.py
+<https://github.com/openwisp/openwisp-notifications/blob/master/tests/openwisp2/sample_notifications/models.py>`_
+as reference for your implementation.
+
+17. Import the automated tests
+------------------------------
+
+When developing a custom application based on this module, it's a good
+idea to import and run the base tests too, so that you can be sure the
+changes you're introducing are not breaking some of the existing feature
+of openwisp-notifications.
+
+In case you need to add breaking changes, you can overwrite the tests
+defined in the base classes to test your own behavior.
+
+See the `tests of the sample_notifications
+<https://github.com/openwisp/openwisp-notifications/blob/master/tests/openwisp2/sample_notifications/tests.py>`_
+to find out how to do this.
+
+**Note**: Some tests will fail if ``templatetags`` and ``admin/base.html``
+are not configured properly. See preceeding sections to configure them
+properly.
+
+Other base classes that can be inherited and extended
+-----------------------------------------------------
+
+The following steps are not required and are intended for more advanced
+customization.
+
+API views
+~~~~~~~~~
+
+The API view classes can be extended into other django applications as
+well. Note that it is not required for extending openwisp-notifications to
+your app and this change is required only if you plan to make changes to
+the API views.
+
+Create a view file as done in `sample_notifications/views.py
+<https://github.com/openwisp/openwisp-notifications/blob/master/tests/openwisp2/sample_notifications/views.py>`_
+
+For more information regarding Django REST Framework API views, please
+refer to the `"Generic views" section in the Django REST Framework
+documentation
+<https://www.django-rest-framework.org/api-guide/generic-views/>`_.
+
+Web Socket Consumers
+~~~~~~~~~~~~~~~~~~~~
+
+The Web Socket Consumer classes can be extended into other django
+applications as well. Note that it is not required for extending
+openwisp-notifications to your app and this change is required only if you
+plan to make changes to the consumers.
+
+Create a consumer file as done in `sample_notifications/consumers.py
+<https://github.com/openwisp/openwisp-notifications/blob/master/tests/openwisp2/sample_notifications/consumers.py>`_
+
+For more information regarding Channels' Consumers, please refer to the
+`"Consumers" section in the Channels documentation
+<https://channels.readthedocs.io/en/latest/topics/consumers.html>`_.

docs/developer/index.rst

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+Developer Docs
+==============
+
+.. include:: ../partials/developer-docs.rst
+
+.. toctree::
+    :maxdepth: 2
+
+    ./installation.rst
+    ./utils.rst
+    ./extending.rst
+
+Other useful resources:
+
+    - :doc:`../user/rest-api`
+    - :doc:`../user/settings`