Flask SQLAlchemy用“不等于"查询列. [英] Flask SQLAlchemy querying a column with "not equals"
本文介绍了Flask SQLAlchemy用“不等于"查询列.的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我可以在Seat
表中查询未分配邀请的所有席位:
I can query my Seat
table for all seats where there is no invite assigned:
seats = Seat.query.filter_by(invite=None).all()
但是,当查询分配了邀请的所有席位时,我会得到一个NameError
:
However, when querying for all seats that have an invite assigned, I get a NameError
:
seats = Seat.query.filter_by(invite!=None).all()
NameError: name 'invite' is not defined
这是我的Seat
课:
class Seat(db.Model):
id = db.Column(db.Integer, primary_key=True)
invite_id = db.Column(db.Integer, db.ForeignKey('invite.id'))
invite = db.relationship('Invite',
backref=db.backref('folks', lazy='dynamic'))
如何查询所有者不为空的所有席位?
How can I query for all seats where the owner is not blank?
推荐答案
seats = Seat.query.filter(Seat.invite != None).all()
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