Updates in CQL-engine

Question

I use Cassandra with Django via cqlengine. Let's assume I have a model like this:

class ExampleModel(Model):
    example_id      = columns.UUID(primary_key=True, default=uuid.uuid4)
    example_types   = columns.List(columns.Integer)
    example_other   = columns.Integer()

I create an object using the following code:

ex = ExampleModel.create(example_types=[1,2,3])

Somewhere else I want to update this row (eg. add some value to example_other) knowing it's example_id:

ex2 = ExampleModel.create(example_id=<this id I know>, example_other=5)

In the old version of cqlengine (0.4.6) it used to work, that is example_types stored in the database used to contain [1,2,3]. After an upgrade to 0.8.5 and after creating ex2, the same object stored in database has example_types set to an empty list. I understand that this is probably cleaner, but I want to be able to update row (alter particular column without altering rest of them) without having to fetch it first. How to achieve this? Thanks in advance!

Facing same problem. Are you able to solve it? Please update if you have found anything. Thanks. — rajpy, Jan 01 '14 at 09:00

score 1 · Answer 1 · answered Mar 12 '15 at 20:46

1

You can perform blind updates in cqlengine.

MyModel.objects(id=1).update(name="Steve")

answered Mar 12 '15 at 20:46

Tim Martin

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Updates in CQL-engine

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