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Docs: Enabling Syntax Highlighting (#1890)
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@@ -12,7 +12,9 @@ Implementing a task
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-------------------
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A common pattern for implementing asynchronous tasks can be seen a lot in ``pretix.base.services``
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and looks like this::
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and looks like this:
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.. code-block:: python
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from pretix.celery_app import app
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@@ -34,13 +36,15 @@ If your user needs to wait for the response of the asynchronous task, there are
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that will probably move to ``pretix.base`` at some point. They consist of the view mixin ``AsyncAction`` that allows
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you to easily write a view that kicks off and waits for an asynchronous task. ``AsyncAction`` will determine whether
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to run the task asynchronously or not and will do some magic to look nice for users with and without JavaScript support.
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A usage example taken directly from the code is::
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A usage example taken directly from the code is:
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.. code-block:: python
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class OrderCancelDo(EventViewMixin, OrderDetailMixin, AsyncAction, View):
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"""
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A view that executes a task asynchronously. A POST request will kick off the
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task into the background or run it in the foreground if celery is not installed.
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In the former case, subsequent GET calls can be used to determinine the current
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In the former case, subsequent GET calls can be used to determine the current
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status of the task.
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"""
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@@ -79,7 +83,9 @@ A usage example taken directly from the code is::
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return super().get_error_message(exception)
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On the client side, this can be used by simply adding a ``data-asynctask`` attribute to an HTML form. This will enable
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AJAX sending of the form and display a loading indicator::
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AJAX sending of the form and display a loading indicator:
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.. code-block:: html
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<form method="post" data-asynctask
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action="{% eventurl request.event "presale:event.order.cancel.do" … %}">
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@@ -27,7 +27,9 @@ numbers and dates, ``LazyDate`` and ``LazyNumber``. There also is a ``LazyLocale
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exceptions with gettext-localized exception messages.
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Last, but definitely not least, we have the ``language`` context manager (``pretix.base.i18n.language``) that allows
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you to execute a piece of code with a different locale::
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you to execute a piece of code with a different locale:
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.. code-block:: python
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with language('de'):
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render_mail_template()
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@@ -16,7 +16,9 @@ We recommend all relevant models to inherit from ``LoggedModel`` as it simplifie
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.. autoclass:: pretix.base.models.LoggedModel
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:members: log_action, all_logentries
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To actually log an action, you can just call the ``log_action`` method on your object::
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To actually log an action, you can just call the ``log_action`` method on your object:
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.. code-block:: python
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order.log_action('pretix.event.order.canceled', user=user, data={})
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@@ -29,7 +31,9 @@ Logging form actions
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""""""""""""""""""""
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A very common use case is to log the changes to a model that have been done in a ``ModelForm``. In this case,
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we generally use a custom ``form_valid`` method on our ``FormView`` that looks like this::
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we generally use a custom ``form_valid`` method on our ``FormView`` that looks like this:
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.. code-block:: python
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@transaction.atomic
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def form_valid(self, form):
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@@ -40,7 +44,9 @@ we generally use a custom ``form_valid`` method on our ``FormView`` that looks l
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messages.success(self.request, _('Your changes have been saved.'))
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return super().form_valid(form)
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It gets a little bit more complicated if your form allows file uploads::
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It gets a little bit more complicated if your form allows file uploads:
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.. code-block:: python
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@transaction.atomic
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def form_valid(self, form):
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@@ -67,7 +73,9 @@ following ready-to-include template::
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We now need a way to translate the action codes like ``pretix.event.changed`` into human-readable
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strings. The :py:attr:`pretix.base.signals.logentry_display` signals allows you to do so. A simple
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implementation could look like::
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implementation could look like:
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.. code-block:: python
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from django.utils.translation import gettext as _
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from pretix.base.signals import logentry_display
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@@ -88,7 +96,9 @@ Sending notifications
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If you think that the logged information might be important or urgent enough to send out a notification to interested
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organizers. In this case, you should listen for the :py:attr:`pretix.base.signals.register_notification_types` signal
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to register a notification type::
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to register a notification type:
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.. code-block:: python
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@receiver(register_notification_types)
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def register_my_notification_types(sender, **kwargs):
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@@ -103,7 +113,9 @@ You should subclass the base ``NotificationType`` class and implement all its me
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.. autoclass:: pretix.base.notifications.NotificationType
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:members: action_type, verbose_name, required_permission, build_notification
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A simple implementation could look like this::
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A simple implementation could look like this:
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.. code-block:: python
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class MyNotificationType(NotificationType):
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required_permission = "can_view_orders"
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@@ -143,7 +155,9 @@ Logging technical information
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-----------------------------
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If you just want to log technical information to a log file on disk that does not need to be parsed
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and displayed later, you can just use Python's ``logging`` module::
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and displayed later, you can just use Python's ``logging`` module:
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.. code-block:: python
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import logging
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@@ -151,7 +165,9 @@ and displayed later, you can just use Python's ``logging`` module::
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logger.info('Startup complete.')
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This is also very useful to provide debugging information when an exception occurs::
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This is also very useful to provide debugging information when an exception occurs:
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.. code-block:: python
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try:
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foo()
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@@ -15,7 +15,9 @@ Requiring permissions for a view
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--------------------------------
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pretix provides a number of useful mixins and decorators that allow you to specify that a user needs a certain
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permission level to access a view::
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permission level to access a view:
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.. code-block:: python
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from pretix.control.permissions import (
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OrganizerPermissionRequiredMixin, organizer_permission_required
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@@ -44,7 +46,9 @@ permission level to access a view::
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# Only users with *any* permission on this organizer can access this
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Of course, the same is available on event level::
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Of course, the same is available on event level:
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.. code-block:: python
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from pretix.control.permissions import (
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EventPermissionRequiredMixin, event_permission_required
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@@ -73,7 +77,9 @@ Of course, the same is available on event level::
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# Only users with *any* permission on this event can access this
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You can also require that this view is only accessible by system administrators with an active "admin session"
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(see below for what this means)::
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(see below for what this means):
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.. code-block:: python
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from pretix.control.permissions import (
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AdministratorPermissionRequiredMixin, administrator_permission_required
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@@ -89,7 +95,9 @@ You can also require that this view is only accessible by system administrators
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# ...
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In rare cases it might also be useful to expose a feature only to people who have a staff account but do not
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necessarily have an active admin session::
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necessarily have an active admin session:
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.. code-block:: python
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from pretix.control.permissions import (
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StaffMemberRequiredMixin, staff_member_required
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@@ -39,7 +39,9 @@ subclass that also adds support for internationalized fields:
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.. autoclass:: pretix.base.forms.SettingsForm
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You can simply use it like this::
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You can simply use it like this:
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.. code-block:: python
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class EventSettingsForm(SettingsForm):
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show_date_to = forms.BooleanField(
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@@ -56,7 +58,9 @@ You can simply use it like this::
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Defaults in plugins
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-------------------
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Plugins can add custom hardcoded defaults in the following way::
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Plugins can add custom hardcoded defaults in the following way:
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.. code-block:: python
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from pretix.base.settings import settings_hierarkey
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