Question

I know i could have used python’s own functional tool-set, but I wish there’s a way to this in Django.

I have this model:

class AssetGeoFenceEvent(models.Model):
#...
#assets, for which this event is assigned
asset = models.ForeignKey(Asset)
#...

and the referenced Asset model is like:

class Asset(models.Model):
#...
client = models.ForeignKey(Client)
#....

I thought I could do:

#get all the registered events for this client
events = AssetGeoFenceEvent.objects.filter(asset.client == client)

but that fails with error :

keyword can’t be an expression

Tried this but it fails:

#get all the registered events for this client
events = AssetGeoFenceEvent.objects.filter(lambda a: a.client == client)

Which gives me an error

‘function’ object is not iterable

So how can I pull this off using Django?

Answer 1

You’re doing it wrong.

events = AssetGeoFenceEvent.objects.filter(asset__client=client)