Hi,
I have a puzzle here I can't solve, if you have an idea or a starting
point, it would be very useful and appreciated.
In order to have an easy way to link to the next object and the
previous one (with special ordering), I add to my model two Foreignkey
pointing to self. These keys point to the previous and next object.
When it saves a new object, it set the previous and the next object
into these field.
But when I want to delete an object, the inheritance empty all the
model's objects.
To go around this, I override the delete() method to set to None the
next and previous of the foreign object.
But I have a problem when I do a batch delete.
Here is a schema
object1, object2, object3
objects1.next = object2
object1.previous = object3
object2.previous = object1
object2.next = object3
object3.previous = object2
object3.nest = object1
So if I delete object 1, I expect this result:
object2.previous = object3
object2.next = object3
object3.previous = object2
object3.next = object2
Here is the steps :
1. It set the previous.next and next.previous to another object
instead of the one that is going to be delete()
2. Save previous and next object
3. It set the object.previous and object.next to None (no inheritance
deletion)
4. It save the current object before being delete (no inheritance
deletion)
The problem happens on step 2.
I need to call save two times on two different object. But the second
save doesn't work. When delete() is called on the second object, the
previous or next field that has been change is set to none. But when I
check in the admin the field has been correctly saved.?!?
Is someone has an idea why it do that?
Or do you have a better way I can look at?
Thank you
Francis
Code:
def remove_product_position(self, selected_product):
#print("remove_product_position is getting called")
try:
previous = selected_product.previous
except:
previous = None
try:
next = selected_product.next
except:
next = None
if previous == next:
""" in condition there is only one product """
previous_product = selected_product.previous
previous_product.next = selected_product.next
previous_product.previous = selected_product.previous
previous_product.save(reorder=False)
else:
next_product = selected_product.next
next_product.previous = selected_product.previous
next_product.save(reorder=False)
previous_product = selected_product.previous
previous_product.next = selected_product.next
previous_product.save(reorder=False)
selected_product.previous = None
selected_product.next = None
selected_product.save(reorder=False)
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