How to repeat django event occurrence period?

Question

I have a model that gets the day and time of week when an event should always occur. Also, the number of days before the event that people will be able to attend.

def validate_only_one(obj):
    model = obj.__class__
    if model.objects.count() > 0 and obj.id != model.objects.get().id:
        raise ValidationError("Você só pode adicionar um evento") # You can add only one schedule


class ModelPresenca(models.Model):
    DIAS = (
        # The days are in Portuguese
        ('Domingo', 'Domingo'),
        ('Segunda', 'Segunda'),
        ('Terça', 'Terça'),
        ('Quarta', 'Quarta'),
        ('Quinta', 'Quinta'),
        ('Sexta', 'Sexta'),
        ('Sábado', 'Sábado'),
    )
    dia = models.CharField('Dia da Pelada', max_length=10, help_text='Escolha o dia da pelada', choices=DIAS) # day of the event 
    hora_pelada = models.TimeField('Horário da pelada (ex: 19:30)', help_text='Hora em que sua pelada é realizada') # hour of the event 
    dias_antecedencia = models.PositiveIntegerField('Dias antecedência',
                                                    default=1,
                                                    validators=[MinValueValidator(1), MaxValueValidator(6)],
                                                    help_text='Em quantos dias de antecência os peladeiros devem '
                                                              'marcar presença') # numbers of days before event

However, I don't know how to make this event repeat without requiring the user to add the same information every week. I'm thinking of the following algorithm:

def period(request):

    event_data = ModelPresenca.objects.all() # I have always only one object

    hour_timefield = datetime.strptime(h.hora_pelada, '%H:%M') # TimeField to string
    day = event_data.dia # Day of the event 
    b_days = event_data.dias_antecedencia # Number of days before event 

    week_d = week_day(day) # week_day is a function that converts day to int 
    event_d = event_day(week_d, hour_timefield) # event_day is a function that returns the date of full event occur
    conf_d = event_open_date(b_days, event_d) # Is a function that returns date of open to confirm


    n = datetime.now()
    t_str = '{}-{}-{}'.format(n.year, n.month, n.day)
    t_hour = ' {}:{}'.format(n.hour, n.minute)
    today = t_str + t_hour
    today = datetime.strptime(today, '%Y-%m-%d %H:%M')

    if (conf_d <= today) and (today < event_d):
        # Show formulary to confirm presence 
    else:
        # another thing, ie, hidden formulary

I believe that this last code block have to repeat, but I don't know to do this and I don't know if It's the best way. If anyone can help me, I appreciate.

score 1 · Accepted Answer · answered Dec 27 '19 at 13:13

1

You can use Django Celery. Celery is an asynchronous task queue/job queue based on distributed message passing. It is focused on real-time operation, but supports scheduling as well.

Here are first steps for django celery. You could create a post_save method in your model, where you will run a asynchronous task, which will add events as you wish. Additionally there is a Celery beat which enables you creating asynchronous periodic tasks.

For example:

@app.task()
def period():
    # Do your stuff here

and then in your settings file add your celery beat schedule:

CELERY_BEAT_SCHEDULE = {
 'add-periodic-events': { 
     'task': 'my_app.my_tasks.periodic', # this is a path to your file separated by '.'
     'schedule': crontab(minute=0, hour=0), # Execute daily at midnight.
    },    
}

answered Dec 27 '19 at 13:13

sebb

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Hi, thanks for your attention! I have a question: do you think putting the midnight schedule can work? I mean, the opening date for event confirmation, for example, can be 3 days before the event (on a Wednesday) and closing on the day and time of the event, ie Saturday at 7:30 pm. How to check this last time? – Thales Dec 27 '19 at 13:26
This was an example. You can change it to hourly schedule. And in each hour, you get all of your events, which are new and you send information about your event. You could add a new field to your Event model, where you store a status, whether the user have been informed. For example: Your task iterates every hour and gets all events. Afterwards checks whether it needs to send a confirmation email If it is necessary you send mail, if not, you go to another event. – sebb Dec 27 '19 at 13:31

How to repeat django event occurrence period?

1 Answers1