FastAPI & sqlAlchemy: TypeError: Array() missing 1 required positional argument: 'sequence'

Question

為數組制作 sqlAlchemy 模型時，請在下面給出

class Post(base):
 __tablename__ = "posts"
   answer = column(Array[string],nullable=false)

sqlAlchemy 拋出錯誤，

TypeError: Array() missing 1 required positional argument: 'sequence'

我究竟做錯了什么？

Answer 1

看來您沒有正確定義表定義。 請參閱示例表定義。

from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import String, Column
from sqlalchemy.dialects.postgresql import ARRAY

Base = declarative_base()

class Post(Base):
    __tablename__ = 'post'

    id = Column(Integer, primary_key=True)
    answer = Column(ARRAY(String))

參考：

• https://docs.sqlalchemy.org/en/13/orm/extensions/declarative/basic_use.html
• https://docs.sqlalchemy.org/en/14/dialects/postgresql.html