Hi, 
Lets say I have this table:
db.define_table('OffersCity', 
                Field('city', db.City), 
                Field('offer', db.Offer),
                Field('hotel', db.Hotel))

I want to create a smartgrid, but it's not working... I don't know why: 
Here it's my code:
table = SQLFORM.smartgrid(db. OffersCity, constraints=None) 
And this is the error given: 
Query Not Supported: invalid filter: __key__ filter value must be a 
Key;received 
None (a NoneType)
I'm on Google App Engine.
Kind Regards,
Jose M 



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