- Author:
- johnnoone
- Posted:
- May 5, 2009
- Language:
- Python
- Version:
- 1.0
- Tags:
- decorator signals once
- Score:
- 3 (after 3 ratings)
Decorates signals for executing only one time
Exemple usage :
from django.core.mail import EmailMultiAlternatives
from django.template.loader import render_to_string
from django.contrib.auth.models import User
@one
def user_welcome(sender, instance, created, **kwargs):
# Send a welcome email
if created == True and isinstance(instance, User):
instance.message_set.create(message=_(u"Ho, Welcome %s!" % instance))
subject, from_email, to = 'Welcome !', '[email protected]', instance.email
text_content = render_to_string('mail/welcome.html', { 'user': instance })
msg = EmailMultiAlternatives(subject, text_content, from_email, [to])
msg.send()
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | from functools import wraps
def one(func=None):
"""decorates signals for executing only one time
Exemple Usage --
from django.core.mail import EmailMultiAlternatives
from django.template.loader import render_to_string
from django.contrib.auth.models import User
@one
def user_welcome(sender, instance, created, **kwargs):
# Send a welcome email
if created == True and isinstance(instance, User):
instance.message_set.create(message=_(u"Ho, Welcome %s!" % instance))
subject, from_email, to = 'Welcome !', '[email protected]', instance.email
text_content = render_to_string('mail/welcome.html', { 'user': instance })
msg = EmailMultiAlternatives(subject, text_content, from_email, [to])
msg.send()
"""
E = '_exec_one_time'
@wraps(func)
def wrapper(*args, **kwargs):
try:
instance = kwargs['instance']
e = getattr(instance, E, [])
c = func.__name__
if c not in e:
e.append(c)
setattr(instance, E, e)
return func(*args, **kwargs)
except:
return func(*args, **kwargs)
return wrapper
|
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