Flask SQLAlchemy用“不等于"查询列. [英] Flask SQLAlchemy querying a column with "not equals"

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

您要使用 filter() 方法，该方法允许!=:

seats = Seat.query.filter(Seat.invite != None).all()

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