Mongoose 有时将 objectId 保存为字符串，有时不保存 [英] Mongoose sometimes save objectId as string, some times no

问题描述

有时 mongoose 将main_id"保存为字符串而不是 ObjectId，保存后我在 mongoshell 和 UI 客户端中看到字符串类型.

Sometimes mongoose save "main_id" as string instead of ObjectId, after save I see string type in mongoshell and UI client.

猫鼬:4.11.0

我有架构:

var building = new Schema({
    location: {
        main_id: { type: Schema.Types.ObjectId,  ref: 'locations'},
        title: {type: String},
        description: {type: String}
    },
    year: {type: Number}
});

var User = new Schema({    
    my_location: {
        now: building,
        more: [building]
    }
})

当下面的代码运行时，有时我在数据库中得到字符串而不是 objectId.

When code below runs sometimes I got string in DB instead objectId.

user.my_location.more[i].location.main_id = new mongoose.Types.ObjectId("584fe811ed936fe74d8b470e")
user.save()

当我在保存后检查 typeof user.my_location.more[i].location.main_id 时显示对象"但在 DB 中显示字符串:) 并且当我在 mongoDB 中使用 ObjectId 运行查询时，我找不到这个更新的文档

When I check typeof user.my_location.more[i].location.main_id after save is says "object" but in DB show string :) and when I run query in mongoDB with ObjectId I can't found this updated document

推荐答案

强制告诉猫鼬保存一些东西(在我的案例中解决了有时"问题)

当我为变量 mongoose 设置类似值的字段时，会检查架构的更改并仅更新它们(正如我从文档中所理解的那样)，但 mongoose 不会检查嵌套数组的更改.

When I set field like value for variable mongoose checks changes for schema and update only them (as I understood from docs) but mongoose don't check nested arrays for changes.

所以我们有两个原生技巧:

So we have two native tricks:

1. 强制告诉猫鼬哪个字段被修改了

1. Force tell mongoose which field was modified

user.markModified('my_location.more')user.save()//现在一切顺利

通过set

user.my_location.more[i].location.main_id = new mongoose.Types.ObjectId("584fe811ed936fe74d8b470e")user.my_location.more[i].year = 2019user.my_location.set(i, user.my_location.more)//设置整个改变的对象user.save()

这篇关于Mongoose 有时将 objectId 保存为字符串，有时不保存的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！