使用filter_by不能按预期工作

Question

I am trying to get the count of categories in item_name using this script below

db.session.query(func.count(Garden.id).label('count'),Garden.item_name).group_by(Garden.item_name).all()

Works like a charm, but I need to filter this by specifying another condition, which I am not able to get it right. But I tried this script below.

db.session.query(func.count(Garden.id).label('count'),Garden.item_name).group_by(Garden.item_name).filter_by(Garden.item_type='vegetable').all()

i am trying to include item_type specific condition. But, I am making some mistake that I get an error. I am also aware its not how we add filter and group by at the same time. Can anyone post your solution?

Thanks

Answer 1

好的，我解决了。

db.session.query(func.count(Garden.id).label('count'),Garden.item_name).filter(Garden.item_type=="vegetable").group_by(Garden.item_name).all()