1 # This is the denormalisation engine

     2 # his goal is to leverage on django's signal to update

     3 # denormalized fields

     4 # this should be used with beanstalk or starling

     5 # python client (there is 2) http://github.com/earl/beanstalkc/tree/master

     6 

     7 import logging

     8 from django.db.models import signals

     9 from cm.models import TextVersion, Text

    10 

    11 # Text denormalisation

    12 def update_text_from_last_version(sender, **kwargs):

    13     """

    14     Update text's last version

    15     """

    16     text_version = kwargs['instance']

    17     try:

    18         text = text_version.text

    19         text.update_denorm_fields()

    20     except Text.DoesNotExist:

    21         logging.warning('No text found for text_version: %i' %text_version.id)

    22         

    23         

    24 def connect_all():

    25     # text updated by text_version

    26     signals.post_save.connect(update_text_from_last_version, sender=TextVersion)

    27     signals.post_delete.connect(update_text_from_last_version, sender=TextVersion)

    28 

    29 

    30 connect_all()