问获取Knex事务中的友好错误消息

EN

我正在使用Knex中的事务来删除和更新一些数据，这些数据运行良好，但偶尔也会从内部进程中抛出错误。我能够捕获错误并对它们作出反应，但我似乎无法获得描述错误的“友好”错误消息。下面是一个示例：

交易代码：

try {
    const trxResponse = await this.knex.transaction(async (trx) => {

        // ... do some stuff ...

        // Error is thrown within this operation
        return await trx(this.tableName)
            .insert(data)
            .returning(this.fieldsToReturn);
    });

    return trxResponse;

} catch (err) {
    console.log('handled', err, JSON.stringify(err), err.message);
    throw new QueryError();
}

上面的console.log为每个值打印以下值(这些是真正的错误)：

err：{ error: invalid input value for enum relationship: "yourself"... /* stack trace */ <--我需要这个没有堆栈跟踪的文本

JSON.stringify(err)：{"name":"error","length":102,"severity":"ERROR","code":"22P02","file":"enum.c","line":"60","routine":"enum_in"}

err.message：insert into "beneficiary" ("application", "email", "firstName", "lastName", "middleInitial", "percentage", "relationship", "suffix") values ($1, $2, $3, $4, $5, $6, $7, $8), ($9, $10, $11, $12, $13, $14, $15, $16) returning "firstName", "lastName", "suffix", "middleInitial", "email", "percentage", "relationship" - invalid input value for enum relationship: "yourself"

我真正需要的是当您在上面console.log(err)时显示的“错误”文本。如何从错误中仅拉出这条字符串？我想不出怎么才能得到那根绳子。

谢谢!