Watch any object/field/relation/generic relation of django and recive signals
Project description
Watch modification of any type of field in Django’s model and call registered callback function
This observer can watch
Any value type of field (CharField, IntegerField …)
Any Model type of field (ForeignKey, OneToOneField, GenericForeignKey)
Any RelatedManager type of field (field automatically created via related_name of ForeignKey)
Any ManyRelatedManager type of field (ManyToManyField)
Any GenericRelatedObjectManager type of field (GenericRelation)
Any Model instance
Install
This library is on PyPI so you can install it with:
pip install django-observer
or from github:
pip install git+https://github.com/lambdalisue/django-observer.git
Usage
>>> from django.db import models
>>> from observer import watch
>>>
>>> class Entry(models.Model):
... status = models.CharFiled('status', max_length=10)
... body = models.CharField('title', max_length=100)
...
... def save(self, *args, **kwargs):
... super(Entry, self).save(*args, **kwargs)
...
... # Watch callback, this is automatically called if `status` is **changed**
... def watch_callback(sender, obj, attr):
... # sender is a watcher instance
... # obj is a instance of target
... # attr is a name of target field
... if obj.status == 'draft':
... obj.title = "draft - %s" % obj.body
... else:
... obj.title = "publish - %s" % obj.body
... # Start watching
... self._watcher = watch(self, 'status', watch_callback)
See observer_test/src/miniblog/blog/tests/test_observer.py for more detail.
Settings
- OBSERVER_DEFAULT_WATCHER
A class of watcher. Default is ‘observer.watcher.complex.ComplexWatcher’
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