search.py 文件源码

def __init__(self, *expressions, **extra):
        super(SearchVector, self).__init__(*expressions, **extra)
        self.source_expressions = [
            Coalesce(expression, Value('')) for expression in self.source_expressions
        ]
        self.config = self.extra.get('config', self.config)
        weight = self.extra.get('weight')
        if weight is not None and not hasattr(weight, 'resolve_expression'):
            weight = Value(weight)
        self.weight = weight