让我的SQLAlchemy类正常工作有点麻烦。我已经做了很多研究,并且知道这个Stack [answer] [1]。但是,这在这里不起作用。我的代码如下:
class EventListModel(db.Model, BaseModel, PaginationMixin):
"""
Event List Model
"""
#table name
__tablename__ = 'event_list'
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String(128), nullable=False)
list_item_br = relationship('ListItemModel', cascade='all,delete',
backref=backref('EventListModel'))
我的孩子班级如下:
class ListItemModel(db.Model, BaseModel, PaginationMixin):
"""
List Item Model
"""
#table name
__tablename__ = 'list_item'
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String(128), nullable=False)
url = db.Column(db.String(256))
description = db.Column(db.String(512))
每次我尝试将一个项目添加到Child类时,都会收到以下IntegrityError:
sqlalchemy.exc.IntegrityError: (psycopg2.errors.NotNullViolation) null value in column
"event_list_id" violates not-null constraint
DETAIL: Failing row contains (9, Vollyball, https://orrettmorgan.com, Walmart has the cheapest ones I have seen.
If you don't mind spe..., 3f3ef8cd-8c43-4c48-a3fa-2bd9f1432c88, null).
我是否需要在某个地方进行declarative_base实例化,或者分配逻辑中是否存在错误?
先谢谢了。 [1]:SQLAlchemy - what is declarative_base