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Please considering a bug:
I'm in situation which fetching the same db record but different instance, each modified somewhere.
item1 = get_item(filter='A') # return new instance of rec A
item2 = get_item(filter='A') # also return new instance of rec A
# item1 and item2 refer to the same db record, but different instance
item1.some_field = 'some value'
item2.other_field = 'other value'
The item1 data won't saved correctly after committing transaction (different field changes)
This is correct, calling a model's save method will wholesale update the row in the database with the field data present on the model instance at the time of saving. item2 will not automatically receive changes made to item1, since they are separate instances. This is intended behavior.
If you want to only update a single column, use update: