Question

我正在尝试一个RESTful示例。我正在使用Flask，棉花糖，sqlalchemy和Postgres DB 问题在于，一张表中的FK似乎被视为字段。

我尝试了谷歌搜索，但没有成功。

这就是我所拥有的

Model.py

class Customer(db.Model):
    __tablename__ = 'customers'
    __table_args__ = {"schema": "business"}
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.Text, nullable=False)
    status = db.Column(db.Integer, nullable=False)


# Define the JSON schemas
class CustomerSchema(ma.ModelSchema):
    class Meta:
        model = Customer

class Token(db.Model):
    __tablename__ = 'tokens'
    __table_args__ = {"schema": "business"}
    id = db.Column(db.Integer, primary_key=True)
    token = db.Column(db.String(60), nullable=False)
    name = db.Column(db.String(30), nullable=False)
    token_type = db.Column(db.Integer, nullable=False, default=0)
    description = db.Column(db.String(60), nullable=True)
    created = db.Column(db.TIMESTAMP,
                        server_default=db.func.timezone('UTC',
                            db.func.current_timestamp()),
                        nullable=True)
    expires = db.Column(db.TIMESTAMP,
                        server_default=db.func.timezone('UTC',
                            db.func.current_timestamp()),
                        nullable=True)
    # Add FK to Customer
    customer_id = db.Column(db.Integer, db.ForeignKey('business.customers.id',
                            ondelete='CASCADE'),
                            nullable=False)
    customer = db.relationship('Customer',
                               backref=db.backref('customers', lazy='dynamic'))


# defines the JSON schemas
class TokenSchema(ma.ModelSchema):
    class Meta:
        model = Token

这是我的终点代码：

# Get ALL Tokens
class TokenList(Resource):
    def get(self):
        tokens = Token.query.all()
        tokens = tokens_schema.dump(tokens)
        return {'status': 'success', 'data': tokens}, 200

当我调用此终点时，出现此错误：

sqlalchemy.exc.ProgrammingError: (psycopg2.ProgrammingError) column tokens.customer_id does not exist

这是真的！该表上不存在它是FK

通过此（生成的）SQL：

SQL: 'SELECT business.tokens.id AS business_tokens_id, business.tokens.token AS business_tokens_token, business.tokens.name AS business_tokens_name, business.tokens.token_type AS business_tokens_token_type, business.tokens.description AS business_tokens_description, business.tokens.created AS business_tokens_created, business.tokens.expires AS business_tokens_expires, business.tokens.customer_id AS business_tokens_customer_id \nFROM business.tokens'

我在令牌表中的所有行之后，因此我不尝试将其连接到客户表。我不明白为什么将它包含在select语句中？

感谢所有帮助！

sqlalchemy /棉花糖的外键问题

0 个答案: