node.js 阻止 Mongoose 为子文档数组项创建 _id 属性
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Stop Mongoose from creating _id property for sub-document array items
提问by Atlas
If you have subdocument arrays, Mongoose automatically creates ids for each one. Example:
如果您有子文档数组，Mongoose 会自动为每个数组创建 id。例子：
{
_id: "mainId"
subDocArray: [
{
_id: "unwantedId",
field: "value"
},
{
_id: "unwantedId",
field: "value"
}
]
}
Is there a way to tell Mongoose to not create ids for objects within an array?
有没有办法告诉 Mongoose 不为数组中的对象创建 id？
回答by throrin19
It's simple, you can define this in the subschema :
很简单，你可以在 subschema 中定义它：
var mongoose = require("mongoose");
var subSchema = mongoose.Schema({
//your subschema content
},{ _id : false });
var schema = mongoose.Schema({
// schema content
subSchemaCollection : [subSchema]
});
var model = mongoose.model('tablename', schema);
回答by Joel Grenon
You can create sub-documents without schema and avoid _id. Just add _id:falseto your subdocument declaration.
您可以创建没有架构的子文档并避免_id. 只需添加_id:false到您的子文档声明。
var schema = new mongoose.Schema({
field1:{
type:String
},
subdocArray:[{
_id:false,
field :{type:String}
}]
});
This will prevent the creation of an _idfield in your subdoc.
这将阻止_id在您的子文档中创建字段。
Tested in Mongoose v5.9.10
在猫鼬中测试 v5.9.10
回答by wlingke
Additionally, if you use an object literal syntax for specifying a sub-schema, you may also just add _id: falseto supress it.
此外，如果您使用对象字面量语法来指定子模式，您也可以添加_id: false以抑制它。
{
sub: {
property1: String,
property2: String,
_id: false
}
}
回答by jemiloii
I'm using mongoose 4.6.3 and all I had to do was add _id: false in the schema, no need to make a subschema.
我正在使用 mongoose 4.6.3，我所要做的就是在模式中添加 _id: false ，无需创建子模式。
{
_id: ObjectId
subDocArray: [
{
_id: false,
field: "String"
}
]
}
回答by Deeksha Sharma
You can use either of the one
您可以使用其中任何一个
var subSchema = mongoose.Schema({
//subschema fields
},{ _id : false });
or
或者
var subSchema = mongoose.Schema({
//subschema content
_id : false
});
Check your mongoose version before using the second option
在使用第二个选项之前检查你的猫鼬版本
回答by Oliver White
If you want to use a predefined schema (with _id) as subdocument (without _id), you can do as follow in theory :
如果您想使用预定义的模式（带 _id）作为子文档（不带 _id），理论上可以执行以下操作：
const sourceSchema = mongoose.Schema({
key : value
})
const subSourceSchema = sourceSchema.clone().set('_id',false);
But that didn't work for me. So I added that :
但这对我不起作用。所以我补充说：
delete subSourceSchema.paths._id;
Now I can include subSourceSchema in my parent document without _id. I'm not sure this is the clean way to do it, but it work.
现在我可以在没有 _id 的情况下在我的父文档中包含 subSourceSchema。我不确定这是做到这一点的干净方式，但它有效。
