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Django post_save signal called before save done
2019 Community Moderator ElectionDjango's post_save signal behaves weirdly with models using multi-table inheritanceDjango - post_save timing issue - how to implement a signal for action “database save finalized”Is there any difference in the use of the signals post_delete and post_save?Reading a recursive field on post_save of django modelDjango assert post_save signal calledhandle `post_save` signal in celeryDjango - Multiple post_save signals after create despite dispatch_uidDjango-polymorphic pre-save signaldjango : How to use signals?How to check if Django Signal works?
When creating an object with a custom save method the post_save signal is called before the database object is really saved to the database.
class Task(models.Model):
date_last_state_change = models.DateTimeField(null=True, blank=True)
def save(self, *args, **kwargs):
print("SAVING TASK")
print(self.date_last_state_change)
super().save(*args, **kwargs)
print("SAVING TASK 2")
print(self.date_last_state_change)
And following signals:
@receiver(post_save, sender=Task)
def create_initial_tag_for_task(instance, created, *args, **kwargs):
if created:
TagMapping.objects.create(content_object=instance, tag=TagMapping.add_and_return_tag("open"))
@receiver(post_save, sender=TagMapping)
def set_timestamp_for_mapped_task(instance, created, *args, **kwargs):
task_type = ContentType.objects.get_for_model(Task)
if instance.tag.is_state and instance.content_type.pk == task_type.pk:
task = Task.objects.get(pk=instance.object_id)
task.date_last_state_change = datetime.now()
task.save()
So when I create a Task I create a generic relation to that object and give it a tag. As soon as I created a state tag I want to set the property of the Task object.
And this is the console output when creating a new Task:
SAVING TASK
None
SAVING TASK
2019-03-05 14:12:25.958946
SAVING TASK 2
2019-03-05 14:12:25.958946
SAVING TASK 2
None
With that the date in the database object is None. I really don't understand why.
python django django-models orm
asked 7 mins ago
Dominic M.Dominic M.
79110
add a comment |
When creating an object with a custom save method the post_save signal is called before the database object is really saved to the database.
class Task(models.Model):
date_last_state_change = models.DateTimeField(null=True, blank=True)
def save(self, *args, **kwargs):
print("SAVING TASK")
print(self.date_last_state_change)
super().save(*args, **kwargs)
print("SAVING TASK 2")
print(self.date_last_state_change)
And following signals:
@receiver(post_save, sender=Task)
def create_initial_tag_for_task(instance, created, *args, **kwargs):
if created:
TagMapping.objects.create(content_object=instance, tag=TagMapping.add_and_return_tag("open"))
@receiver(post_save, sender=TagMapping)
def set_timestamp_for_mapped_task(instance, created, *args, **kwargs):
task_type = ContentType.objects.get_for_model(Task)
if instance.tag.is_state and instance.content_type.pk == task_type.pk:
task = Task.objects.get(pk=instance.object_id)
task.date_last_state_change = datetime.now()
task.save()
So when I create a Task I create a generic relation to that object and give it a tag. As soon as I created a state tag I want to set the property of the Task object.
And this is the console output when creating a new Task:
SAVING TASK
None
SAVING TASK
2019-03-05 14:12:25.958946
SAVING TASK 2
2019-03-05 14:12:25.958946
SAVING TASK 2
None
With that the date in the database object is None. I really don't understand why.
python django django-models orm
asked 7 mins ago
Dominic M.Dominic M.
79110
add a comment |
When creating an object with a custom save method the post_save signal is called before the database object is really saved to the database.
class Task(models.Model):
date_last_state_change = models.DateTimeField(null=True, blank=True)
def save(self, *args, **kwargs):
print("SAVING TASK")
print(self.date_last_state_change)
super().save(*args, **kwargs)
print("SAVING TASK 2")
print(self.date_last_state_change)
And following signals:
@receiver(post_save, sender=Task)
def create_initial_tag_for_task(instance, created, *args, **kwargs):
if created:
TagMapping.objects.create(content_object=instance, tag=TagMapping.add_and_return_tag("open"))
@receiver(post_save, sender=TagMapping)
def set_timestamp_for_mapped_task(instance, created, *args, **kwargs):
task_type = ContentType.objects.get_for_model(Task)
if instance.tag.is_state and instance.content_type.pk == task_type.pk:
task = Task.objects.get(pk=instance.object_id)
task.date_last_state_change = datetime.now()
task.save()
So when I create a Task I create a generic relation to that object and give it a tag. As soon as I created a state tag I want to set the property of the Task object.
And this is the console output when creating a new Task:
SAVING TASK
None
SAVING TASK
2019-03-05 14:12:25.958946
SAVING TASK 2
2019-03-05 14:12:25.958946
SAVING TASK 2
None
With that the date in the database object is None. I really don't understand why.
python django django-models orm
asked 7 mins ago
Dominic M.Dominic M.
79110
When creating an object with a custom save method the post_save signal is called before the database object is really saved to the database.
class Task(models.Model):
date_last_state_change = models.DateTimeField(null=True, blank=True)
def save(self, *args, **kwargs):
print("SAVING TASK")
print(self.date_last_state_change)
super().save(*args, **kwargs)
print("SAVING TASK 2")
print(self.date_last_state_change)
And following signals:
@receiver(post_save, sender=Task)
def create_initial_tag_for_task(instance, created, *args, **kwargs):
if created:
TagMapping.objects.create(content_object=instance, tag=TagMapping.add_and_return_tag("open"))
@receiver(post_save, sender=TagMapping)
def set_timestamp_for_mapped_task(instance, created, *args, **kwargs):
task_type = ContentType.objects.get_for_model(Task)
if instance.tag.is_state and instance.content_type.pk == task_type.pk:
task = Task.objects.get(pk=instance.object_id)
task.date_last_state_change = datetime.now()
task.save()
So when I create a Task I create a generic relation to that object and give it a tag. As soon as I created a state tag I want to set the property of the Task object.
And this is the console output when creating a new Task:
SAVING TASK
None
SAVING TASK
2019-03-05 14:12:25.958946
SAVING TASK 2
2019-03-05 14:12:25.958946
SAVING TASK 2
None
With that the date in the database object is None. I really don't understand why.
python django django-models orm
python django django-models orm
asked 7 mins ago
Dominic M.Dominic M.
79110
asked 7 mins ago
Dominic M.Dominic M.
79110
asked 7 mins ago
Dominic M.Dominic M.
79110
asked 7 mins ago
Dominic M.Dominic M.
79110
asked 7 mins ago
Dominic M.Dominic M.
79110
79110
add a comment |
add a comment |
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