[Flask] 请教一个 flask 枚举数的问题

问了半天 ai 也没解决。

class ApprovalStatus(PyEnum):
    PENDING = 'pending'
    APPROVED = 'approved'
    REJECTED = 'rejected'


class Approval(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    content_type = db.Column(db.String(50), nullable=False)
    content_id = db.Column(db.Integer, nullable=False)
    field_name = db.Column(db.String(50), nullable=False)
    new_value = db.Column(db.Text, nullable=False)
    status = db.Column(db.Enum(ApprovalStatus), default=ApprovalStatus.PENDING)
    

    submitter_id = db.Column(db.Integer, db.ForeignKey('user.id'), nullable=False)
    submit_time = db.Column(db.DateTime, default=current_time)
    reviewer_id = db.Column(db.Integer, db.ForeignKey('user.id'))
    review_time = db.Column(db.DateTime, default=current_time)
    review_comment = db.Column(db.Text)

    submitter = db.relationship('User', foreign_keys=[submitter_id])
    reviewer = db.relationship('User', foreign_keys=[reviewer_id])

    __table_args__ = (db.UniqueConstraint('content_type', 'content_id'),)

    @property
    def content(self):
        model = getattr(models, self.content_type)
        return model.query.get(self.content_id)

模型是这样，但是在 flask admin 访问审核这个栏目的时候，总是提示

LookupError: 'pending' is not among the defined enum values. Enum name: approvalstatus. Possible values: PENDING, APPROVED, REJECTED

和解哦。

结果检查，数据库的状态栏的值都是小写的。