javascript - mongoose save error

Question

// 我在用户Schema中创建了专栏数组（articles），专栏是对象，底下articles数组嵌套了文章对象，结构类似下图：
// User.articles = [专栏一， 专栏二 ...]
// 专栏一.articles = [ 文章一， 文章二 ...]
// 实际操作中，只要涉及到修改原有值，一保存就报错
// 如splice，pop，或者直接赋值都报错，但push就成功

// 找到专栏，对专栏文章进行splice可以成功修改，但保存操作时报错
user.articles[cindex].articles.splice(aindex, 1, newarticle) // cindex 专栏序号 aindex 文章序号
id = column.articles[aindex]._id
console.log("发布文章更新，id为：", id) // 能输出结果
user.save()

// 可成功修改，保存报错
user.articles[cindex].articles[aindex].name = 'asdfsadf'
user.save()

// 成功
column.articles.push({
    _id : column.articles[aindex]._id,
    name: 'asdfsdf'
})
user.save()

// 报错如下：
// Unhandled rejection Error
//     at model.wrappedPointCut [as save] (C:\nodejs\myblog\node_modules\mongoose\lib\services\model\applyHooks.js:111:29)
//     at User.findOne.then.user (C:\nodejs\myblog\models\UserActions.js:299:10)
//     at tryCatcher (C:\nodejs\myblog\node_modules\bluebird\js\release\util.js:16:23)
//     at Promise._settlePromiseFromHandler (C:\nodejs\myblog\node_modules\bluebird\js\release\promise.js:512:31)
//     at Promise._settlePromise (C:\nodejs\myblog\node_modules\bluebird\js\release\promise.js:569:18)
//     at Promise._settlePromise0 (C:\nodejs\myblog\node_modules\bluebird\js\release\promise.js:614:10)
//     at Promise._settlePromises (C:\nodejs\myblog\node_modules\bluebird\js\release\promise.js:693:18)

When I use save(err=>console.log(err)), a versionkey error is reported. Then I disable versionkey and temporarily prevent this error from occurring.
But after all, I still haven’t figured out the cause of this problem. Please also explain in detail.

Answer 1

You need to use relevant methods to modify and save database data. You cannot directly operate the data attributes. Use save when finished

Answer 2

save method has parameters