validators.py 文件源码

def _validate_unique_case_insensitive(self, model_field, field, value):
        model = model_field.class_

        taken_query = model.query.filter(
            func.lower(model_field) == func.lower(value)
        )
        if self.id is not None:  # in case of update
            taken_query = taken_query.filter(model.id != self.id)
        if taken_query.first() is not None:
            self._error(field, 'has already been taken')