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models.py
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models.py
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#-*- coding: utf-8 -*-
from django.db import models, transaction
from django.core.exceptions import ValidationError
from django.conf import settings
from base.models import ScoutChief, EventHappening
from ragazzi.models import Rover
import logging
logger = logging.getLogger('pippo')
class ScoutChiefSubscription(models.Model):
scout_chief = models.ForeignKey(ScoutChief)
event_happening = models.ForeignKey(EventHappening)
is_locked = models.BooleanField(default=False, verbose_name=u"non si può cancellare")
subscribed_on = models.DateTimeField(auto_now_add=True)
unsubscribed_on = models.DateTimeField(null=True, blank=True)
MAX_SUBSCRIPTIONS = 3
class Meta:
db_table = "subscriptions"
verbose_name = "iscrizione evento"
verbose_name_plural = "iscrizioni eventi"
def __unicode__(self):
return u"%s - %s" % (self.scout_chief, self.event_happening)
def clean(self):
"""
Checks among fields go here
raises ValidationError if not valid
"""
subscriptions = ScoutChiefSubscription.objects.filter(
scout_chief=self.scout_chief
)
n_subscriptions = subscriptions.count()
if n_subscriptions >= self.MAX_SUBSCRIPTIONS:
raise ValidationError(u'Non è possibile iscriversi a più di 3 eventi')
#check no eventi sovrapposti
if subscriptions.filter(event_happening__timeslot=self.event_happening.timeslot).count():
raise ValidationError(u'Capo già iscritto ad un evento di questo turno')
#check che ci siano posti liberi
if not self.event_happening.available_seats:
raise ValidationError(
u"Posti esauriti per l'evento %s, si prega di ricaricare la pagina" % self.event_happening
)
def save(self, *args, **kw):
self.full_clean()
eh = self.event_happening
rv = super(ScoutChiefSubscription, self).save(*args, **kw)
eh.seats_n_chiefs += 1
eh.save()
return rv
@transaction.atomic
def delete(self):
if self.is_locked:
raise ValidationError(u"%s è vincolato a %s: non è possibile eliminarlo" % (
self.scout_chief, self.event_happening
))
eh = self.event_happening
rv = super(ScoutChiefSubscription, self).delete()
eh.seats_n_chiefs -= 1
eh.save()
return rv
#---------------------------------------------------------------------------------
# RABBITMQ part
if settings.RABBITMQ_ENABLE:
from base.models import Event
MODEL_RABBITMQ_MAP = {
EventHappening : 'camp_eventhappenings',
Event : 'camp_events'
}
def get_rabbitmq_routing_key(sender, instance, created):
basename = MODEL_RABBITMQ_MAP.get(sender)
if basename:
action = ['update','insert'][int(created)]
return u"%s.%s" % (basename, action)
else:
return None
import pika
from django.core import serializers
from django.db.models.signals import post_save, pre_save, post_delete
from django.dispatch import receiver
@receiver(post_save)
def my_log_queue(sender, instance, created, **kwargs):
data = serializers.serialize("json", [instance], indent=2)
# Publish changes to RabbitMQ server
routing_key = get_rabbitmq_routing_key(sender, instance, created)
if routing_key:
#RABBITMQ_SETTINGS
RABBITMQ_connection = pika.BlockingConnection(
pika.ConnectionParameters(**settings.RABBITMQ)
)
RABBITMQ_channel = RABBITMQ_connection.channel()
RABBITMQ_channel.basic_publish(
exchange='application', routing_key=routing_key, body=data
)
RABBITMQ_connection.close()
logger.debug("[DB WRITE %s] %s" % (routing_key, data))
@receiver(post_delete)
def my_log_queue_post_delete(sender, instance, using, **kwargs):
data = serializers.serialize("json", [instance], indent=2)
# Publish changes to RabbitMQ server
routing_key = get_rabbitmq_routing_key(sender, instance, True)
if routing_key:
#HACK TO FIX DELETE routing_key... I am in a HURRY!!
routing_key = routing_key.replace('.insert','.delete')
#RABBITMQ_SETTINGS
RABBITMQ_connection = pika.BlockingConnection(
pika.ConnectionParameters(**settings.RABBITMQ)
)
RABBITMQ_channel = RABBITMQ_connection.channel()
RABBITMQ_channel.basic_publish(
exchange='application', routing_key=routing_key, body=data
)
RABBITMQ_connection.close()
logger.debug("[DB WRITE %s] %s" % (routing_key, data))
#----------------------------------------------------------------------------------