django-eventtools 0.9.4

Recurring event tools for django

django-eventtools is a lightweight library designed to handle repeating and one-off event occurrences for display on a website.

Installation

Download the source from https://pypi.python.org/pypi/django-eventtools/ and run python setup.py install, or:

> pip install django-eventtools

Django 1.8 or higher is required.

Setup

Given the following models:

from django.db import models

from eventtools.models import BaseEvent, BaseOccurrence


class Event(BaseEvent):
    title = models.CharField(max_length=100)


class Occurrence(BaseOccurrence):
    event = models.ForeignKey(Event)

Usage

Create a sample event & occurrences

>>> from datetime import datetime
>>> from dateutil import rrule
>>> from myapp.models import Event
>>> event = Event.objects.create(title='Test event')
>>> once_off = Occurrence.objects.create(
        event=event,
        start=datetime(2016, 1, 1, 12, 0),
        end=datetime(2016, 1, 1, 2, 0))
>>> christmas = Occurrence.objects.create(
        event=event,
        start=datetime(2015, 12, 25, 7, 0),
        end=datetime(2015, 12, 25, 22, 0),
        repeat=rrule.YEARLY)
>>> daily = Occurrence.objects.create(
        event=event,
        start=datetime(2016, 1, 1, 7, 0),
        end=datetime(2016, 1, 1, 8, 0),
        repeat=rrule.DAILY)

Event and Occurrence instances, and their associated querysets, all support the all_occurrences method, which takes two optional arguments - from_date and to_date, which may be dates or datetimes. from_date defaults to the current day, to_date to None. The method returns a python generator yielding tuples in the format (start, end, data) - for example:

>>> Event.objects.all().all_occurrences()
>>> event.all_occurrences(from_date=datetime(2015, 1, 1, 10, 0))
>>> event.occurrence_set.all().all_occurrences(to_date=date(2016, 1, 1))
>>> occurrence.all_occurrences(from_date=date(2016, 1, 1),
                               to_date=date(2016, 12, 31))

A next_occurrence method is also provided, taking the same arguments, but returning a single occurrence tuple.

>>> event.next_occurrence()
>>> event.next_occurrence(from_date=date(2016, 1, 1))

Queryset filtering

Querysets can also be filtered, but due to uncertainty with repetitions, from_date filtering is only an approximation (to_date filtering is accurate). If you need a queryset filtered exactly, pass exact=True - this will filter using occurrences but still return a queryset - but be careful with this as it may be very slow. For example

>>> Event.objects.for_period(from_date=date(2015, 1, 1),
                             to_date=date(2015, 12, 31))
>>> event.occurrence_set.for_period(from_date=date(2015, 1, 1), exact=True)

Adding additional data to occurrence tuples

If you need more information about the occurrence than just a pair of dates, add an occurrence_data property to your BaseOccurrence subclass - i.e.

class Occurrence(BaseOccurrence):
    event = models.ForeignKey(Event)

    @property
    def occurrence_data(self):
        return {
            'event_title': self.event.title,
            'image': self.event.image,
        }

The result will be appended to the occurrence tuple, i.e. (start, end, data)

Running tests

Assuming virtualenvwrapper is installed:

> cd path-to/django-eventtools
> mkvirtualenv test
> ./setup.py install
> ./runtests.py