Updating a row using SQLAlchemy ORM

Question

Note: I am not using Flask-SQLAlchemy here, I\'m using SQLAlchemy ORM

I\'ve seen several answers on StackOverflow saying that this is a way to updat

Answer 1

Worked

device = models.Device.query.filter(models.Device.device_identifier == device_identifier).first()

setattr(device, 'updated_at', datetime.now())
setattr(device, 'ip_address', ip_address)
db.session.commit()

Didn't work

device.is_active = True
device.id_address = ip_address
device.updated_at = datetime.now()
print(device.ip_address)
db.session.commit()

Answer 2

I believe you are looking for something like this for your update query:

session.query(FoobarModel).filter(FoobarModel.id == foobar_id).update({'name': 'New Foobar Name!'})

Since update() belongs to Query, and filter() does return a Query object, this will work, contrary to trying to call update() on your FoobarModel object (which does not have such a function) returned by Query.get(), see also here.

As for looping over your properties and assigning them by name, you could do this with setattr and a dict, like this:

foobar = session.query(FoobarModel).get(foobar_id)

props = {'name': 'my new name'}

for key, value in props.items():
    setattr(foobar, key, value)

session.commit()
session.flush()

This is obviously a little pointless with just one property, but maybe it will come in handy at some point.