convert.py 文件源码

def _add_column_kwargs(self, kwargs, column):
        """Add keyword arguments to kwargs (in-place) based on the passed in
        `Column <sqlalchemy.schema.Column>`.
        """
        if column.nullable:
            kwargs['allow_none'] = True
        kwargs['required'] = not column.nullable and not _has_default(column)

        if hasattr(column.type, 'enums'):
            kwargs['validate'].append(validate.OneOf(choices=column.type.enums))

        # Add a length validator if a max length is set on the column
        # Skip UUID columns
        # (see https://github.com/marshmallow-code/marshmallow-sqlalchemy/issues/54)
        if hasattr(column.type, 'length'):
            try:
                python_type = column.type.python_type
            except (AttributeError, NotImplementedError):
                python_type = None
            if not python_type or not issubclass(python_type, uuid.UUID):
                kwargs['validate'].append(validate.Length(max=column.type.length))

        if hasattr(column.type, 'scale'):
            kwargs['places'] = getattr(column.type, 'scale', None)