node.js 如何将 Mongoose 文档转换为普通对象？
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How do you turn a Mongoose document into a plain object?
提问by respectTheCode
I have a document from a mongoose find that I want to extend before JSON encoding and sending out as a response. If I try adding properties to the doc it is ignored. The properties don't appear in Object.getOwnPropertyNames(doc)making a normal extend not possible. The strange thing is that JSON.parse(JSON.encode(doc))works and returns an object with all of the correct properties. Is there a better way to do this?
我有一个来自猫鼬的文档，我想在 JSON 编码和作为响应发送之前扩展它。如果我尝试向文档添加属性，它会被忽略。这些属性不会出现在Object.getOwnPropertyNames(doc)使正常扩展不可能的情况下。奇怪的是，它JSON.parse(JSON.encode(doc))可以工作并返回一个具有所有正确属性的对象。有一个更好的方法吗？
回答by jmar777
Mongoose Models inherit from Documents, which have a toObject()method. I believe what you're looking for should be the result of doc.toObject().
Mongoose Models 继承自Documents，它有一个toObject()方法。我相信你正在寻找的应该是doc.toObject().
http://mongoosejs.com/docs/api.html#document_Document-toObject
http://mongoosejs.com/docs/api.html#document_Document-toObject
回答by JohnnyHK
Another way to do this is to tell Mongoose that all you need is a plain JavaScript version of the returned doc by using lean()in the query chain. That way Mongoose skips the step of creating the full model instance and you directly get a docyou can modify:
另一种方法是通过lean()在查询链中使用，告诉 Mongoose 您需要的只是返回文档的纯 JavaScript 版本。这样 Mongoose 就跳过了创建完整模型实例的步骤，你直接得到一个doc可以修改的：
MyModel.findOne().lean().exec(function(err, doc) {
doc.addedProperty = 'foobar';
res.json(doc);
});
回答by alban maillere
the fast way if the property is not in the model :
如果属性不在模型中，快速方法：
document.set( key,value, { strict: false });
document.set( key,value, { strict: false });
回答by Jalasem
A better way of tackling an issue like this is using doc.toObject()like this
解决这样的问题的一个更好的办法是使用doc.toObject()这样的
doc.toObject({ getters: true })
other options include:
其他选项包括：
getters:apply all getters (path and virtual getters)virtuals:apply virtual getters (can override getters option)minimize:remove empty objects (defaults to true)transform:a transform function to apply to the resulting document before returningdepopulate:depopulate any populated paths, replacing them with their original refs (defaults to false)versionKey:whether to include the version key (defaults to true)
getters:应用所有吸气剂（路径和虚拟吸气剂）virtuals:应用虚拟吸气剂（可以覆盖吸气剂选项）minimize:删除空对象（默认为 true）transform:在返回之前应用于结果文档的转换函数depopulate:删除任何填充的路径，用它们的原始引用替换它们（默认为 false）versionKey:是否包含版本密钥（默认为 true）
so for example you can say
所以例如你可以说
Model.findOne().exec((err, doc) => {
if (!err) {
doc.toObject({ getters: true })
console.log('doc _id:', doc._id)
}
})
and now it will work.
现在它会起作用了。
For reference, see: http://mongoosejs.com/docs/api.html#document_Document-toObject
参考：http: //mongoosejs.com/docs/api.html#document_Document-toObject
回答by dd619
To get plain object from Mongoose document, I used _docproperty as follows
为了从 Mongoose 文档中获取普通对象，我使用_doc了如下属性
mongooseDoc._doc //returns plain json object
I tried with toObjectbut it gave me functions,arguments and all other things which i don't need.
我试过了，toObject但它给了我函数、参数和所有其他我不需要的东西。
回答by kaushik_pm
You can also stringify the object and then again parse to make the normal object. For example like:-
您还可以将对象字符串化，然后再次解析以生成普通对象。例如像：-
const obj = JSON.parse(JSON.stringify(mongoObj))
回答by Antonio Brandao
A convenient way is to apply it straight to the model schema.
一种方便的方法是将其直接应用于模型模式。
As stated in the Mongoose documentation:
正如猫鼬文档中所述：
"To apply these options to every document of your schema by default, set your schemas toObject option to the same argument."
“要将这些选项默认应用于架构的每个文档，请将架构 toObject 选项设置为相同的参数。”
schema.set('toObject', { virtuals: true })
schema.set('toObject', { virtuals: true })
