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337 lines
12 KiB
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337 lines
12 KiB
Plaintext
=================
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Date-based mixins
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=================
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.. currentmodule:: django.views.generic.dates
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.. note::
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All the date formatting attributes in these mixins use
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:func:`~time.strftime` format characters. Do not try to use the format
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characters from the :ttag:`now` template tag as they are not compatible.
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YearMixin
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---------
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.. class:: YearMixin
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A mixin that can be used to retrieve and provide parsing information for a
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year component of a date.
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**Methods and Attributes**
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.. attribute:: year_format
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The :func:`~time.strftime` format to use when parsing the year.
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By default, this is ``'%Y'``.
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.. attribute:: year
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**Optional** The value for the year, as a string. By default, set to
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``None``, which means the year will be determined using other means.
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.. method:: get_year_format()
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Returns the :func:`~time.strftime` format to use when parsing the
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year. Returns :attr:`~YearMixin.year_format` by default.
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.. method:: get_year()
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Returns the year for which this view will display data, as a string.
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Tries the following sources, in order:
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* The value of the :attr:`YearMixin.year` attribute.
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* The value of the ``year`` argument captured in the URL pattern.
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* The value of the ``year`` ``GET`` query argument.
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Raises a 404 if no valid year specification can be found.
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.. method:: get_next_year(date)
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Returns a date object containing the first day of the year after the
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date provided. This function can also return ``None`` or raise an
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:class:`~django.http.Http404` exception, depending on the values of
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:attr:`~BaseDateListView.allow_empty` and
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:attr:`~DateMixin.allow_future`.
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.. method:: get_previous_year(date)
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Returns a date object containing the first day of the year before the
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date provided. This function can also return ``None`` or raise an
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:class:`~django.http.Http404` exception, depending on the values of
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:attr:`~BaseDateListView.allow_empty` and
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:attr:`~DateMixin.allow_future`.
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MonthMixin
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----------
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.. class:: MonthMixin
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A mixin that can be used to retrieve and provide parsing information for a
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month component of a date.
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**Methods and Attributes**
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.. attribute:: month_format
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The :func:`~time.strftime` format to use when parsing the month. By
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default, this is ``'%b'``.
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.. attribute:: month
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**Optional** The value for the month, as a string. By default, set to
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``None``, which means the month will be determined using other means.
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.. method:: get_month_format()
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Returns the :func:`~time.strftime` format to use when parsing the
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month. Returns :attr:`~MonthMixin.month_format` by default.
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.. method:: get_month()
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Returns the month for which this view will display data, as a string.
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Tries the following sources, in order:
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* The value of the :attr:`MonthMixin.month` attribute.
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* The value of the ``month`` argument captured in the URL pattern.
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* The value of the ``month`` ``GET`` query argument.
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Raises a 404 if no valid month specification can be found.
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.. method:: get_next_month(date)
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Returns a date object containing the first day of the month after the
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date provided. This function can also return ``None`` or raise an
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:class:`~django.http.Http404` exception, depending on the values of
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:attr:`~BaseDateListView.allow_empty` and
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:attr:`~DateMixin.allow_future`.
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.. method:: get_previous_month(date)
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Returns a date object containing the first day of the month before the
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date provided. This function can also return ``None`` or raise an
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:class:`~django.http.Http404` exception, depending on the values of
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:attr:`~BaseDateListView.allow_empty` and
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:attr:`~DateMixin.allow_future`.
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DayMixin
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--------
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.. class:: DayMixin
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A mixin that can be used to retrieve and provide parsing information for a
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day component of a date.
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**Methods and Attributes**
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.. attribute:: day_format
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The :func:`~time.strftime` format to use when parsing the day. By
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default, this is ``'%d'``.
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.. attribute:: day
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**Optional** The value for the day, as a string. By default, set to
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``None``, which means the day will be determined using other means.
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.. method:: get_day_format()
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Returns the :func:`~time.strftime` format to use when parsing the day.
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Returns :attr:`~DayMixin.day_format` by default.
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.. method:: get_day()
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Returns the day for which this view will display data, as a string.
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Tries the following sources, in order:
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* The value of the :attr:`DayMixin.day` attribute.
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* The value of the ``day`` argument captured in the URL pattern.
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* The value of the ``day`` ``GET`` query argument.
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Raises a 404 if no valid day specification can be found.
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.. method:: get_next_day(date)
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Returns a date object containing the next valid day after the date
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provided. This function can also return ``None`` or raise an
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:class:`~django.http.Http404` exception, depending on the values of
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:attr:`~BaseDateListView.allow_empty` and
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:attr:`~DateMixin.allow_future`.
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.. method:: get_previous_day(date)
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Returns a date object containing the previous valid day. This function
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can also return ``None`` or raise an :class:`~django.http.Http404`
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exception, depending on the values of
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:attr:`~BaseDateListView.allow_empty` and
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:attr:`~DateMixin.allow_future`.
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WeekMixin
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---------
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.. class:: WeekMixin
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A mixin that can be used to retrieve and provide parsing information for a
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week component of a date.
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**Methods and Attributes**
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.. attribute:: week_format
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The :func:`~time.strftime` format to use when parsing the week. By
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default, this is ``'%U'``, which means the week starts on Sunday. Set
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it to ``'%W'`` if your week starts on Monday.
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.. attribute:: week
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**Optional** The value for the week, as a string. By default, set to
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``None``, which means the week will be determined using other means.
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.. method:: get_week_format()
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Returns the :func:`~time.strftime` format to use when parsing the
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week. Returns :attr:`~WeekMixin.week_format` by default.
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.. method:: get_week()
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Returns the week for which this view will display data, as a string.
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Tries the following sources, in order:
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* The value of the :attr:`WeekMixin.week` attribute.
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* The value of the ``week`` argument captured in the URL pattern
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* The value of the ``week`` ``GET`` query argument.
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Raises a 404 if no valid week specification can be found.
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.. method:: get_next_week(date)
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Returns a date object containing the first day of the week after the
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date provided. This function can also return ``None`` or raise an
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:class:`~django.http.Http404` exception, depending on the values of
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:attr:`~BaseDateListView.allow_empty` and
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:attr:`~DateMixin.allow_future`.
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.. method:: get_prev_week(date)
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Returns a date object containing the first day of the week before the
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date provided. This function can also return ``None`` or raise an
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:class:`~django.http.Http404` exception, depending on the values of
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:attr:`~BaseDateListView.allow_empty` and
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:attr:`~DateMixin.allow_future`.
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DateMixin
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---------
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.. class:: DateMixin
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A mixin class providing common behavior for all date-based views.
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**Methods and Attributes**
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.. attribute:: date_field
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The name of the ``DateField`` or ``DateTimeField`` in the
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``QuerySet``’s model that the date-based archive should use to
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determine the list of objects to display on the page.
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When :doc:`time zone support </topics/i18n/timezones>` is enabled and
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``date_field`` is a ``DateTimeField``, dates are assumed to be in the
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current time zone. Otherwise, the queryset could include objects from
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the previous or the next day in the end user's time zone.
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.. warning::
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In this situation, if you have implemented per-user time zone
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selection, the same URL may show a different set of objects,
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depending on the end user's time zone. To avoid this, you should
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use a ``DateField`` as the ``date_field`` attribute.
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.. attribute:: allow_future
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A boolean specifying whether to include "future" objects on this page,
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where "future" means objects in which the field specified in
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``date_field`` is greater than the current date/time. By default, this
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is ``False``.
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.. method:: get_date_field()
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Returns the name of the field that contains the date data that this
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view will operate on. Returns :attr:`~DateMixin.date_field` by default.
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.. method:: get_allow_future()
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Determine whether to include "future" objects on this page, where
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"future" means objects in which the field specified in ``date_field``
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is greater than the current date/time. Returns
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:attr:`~DateMixin.allow_future` by default.
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BaseDateListView
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----------------
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.. class:: BaseDateListView
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A base class that provides common behavior for all date-based views. There
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won't normally be a reason to instantiate
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:class:`~django.views.generic.dates.BaseDateListView`; instantiate one of
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the subclasses instead.
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While this view (and its subclasses) are executing, ``self.object_list``
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will contain the list of objects that the view is operating upon, and
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``self.date_list`` will contain the list of dates for which data is
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available.
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**Mixins**
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* :class:`~django.views.generic.dates.DateMixin`
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* :class:`~django.views.generic.list.MultipleObjectMixin`
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**Methods and Attributes**
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.. attribute:: allow_empty
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A boolean specifying whether to display the page if no objects are
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available. If this is ``True`` and no objects are available, the view
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will display an empty page instead of raising a 404.
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This is identical to
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:attr:`django.views.generic.list.MultipleObjectMixin.allow_empty`,
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except for the default value, which is ``False``.
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.. attribute:: date_list_period
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**Optional** A string defining the aggregation period for
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``date_list``. It must be one of ``'year'`` (default), ``'month'``, or
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``'day'``.
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.. method:: get_dated_items()
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Returns a 3-tuple containing (``date_list``, ``object_list``,
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``extra_context``).
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``date_list`` is the list of dates for which data is available.
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``object_list`` is the list of objects. ``extra_context`` is a
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dictionary of context data that will be added to any context data
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provided by the
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:class:`~django.views.generic.list.MultipleObjectMixin`.
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.. method:: get_dated_queryset(**lookup)
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Returns a queryset, filtered using the query arguments defined by
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``lookup``. Enforces any restrictions on the queryset, such as
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``allow_empty`` and ``allow_future``.
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.. method:: get_date_list_period()
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Returns the aggregation period for ``date_list``. Returns
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:attr:`~BaseDateListView.date_list_period` by default.
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.. method:: get_date_list(queryset, date_type=None, ordering='ASC')
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Returns the list of dates of type ``date_type`` for which ``queryset``
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contains entries. For example, ``get_date_list(qs, 'year')`` will
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return the list of years for which ``qs`` has entries. If
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``date_type`` isn't provided, the result of
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:meth:`~BaseDateListView.get_date_list_period` is used. ``date_type``
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and ``ordering`` are simply passed to
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:meth:`QuerySet.dates()<django.db.models.query.QuerySet.dates>`.
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