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如何在SQLAlchemy中获取所需的验证器？实际上我只是想确保用户填写表格中的所有必填字段.我使用PostgreSQL,但它没有意义,因为从models.py文件中的Objects创建的表:

 from sqlalchemy import (
    Column,
    Integer,
    Text,
    DateTime,
    )

from sqlalchemy.ext.declarative import declarative_base

from sqlalchemy.orm import (
    scoped_session,
    sessionmaker,
    )

from zope.sqlalchemy import ZopeTransactionExtension

from pyramid.security import (
    Allow,
    Everyone,
    )

Base = declarative_base()


class Article(Base):
    """ The SQLAlchemy declarative model class for a Article object. """
    __tablename__ = 'article'

    id = Column(Integer, primary_key=True)
    name = Column(Text, nullable=False, unique=True)
    url = Column(Text, nullable=False, unique=True)
    title = Column(Text)
    preview = Column(Text)
    content = Column(Text)
    cat_id = Column(Integer, nullable=False)
    views = …