这可以提高对哈希键的查询性能,因为 MongoDB 不需要扫描整个集合来查找匹配的文档。...const userSchema = new mongoose.Schema({ _id: mongoose.Schema.Types.ObjectId }); userSchema.index...({ title: 'text', content: 'text' }); 唯一索引(Unique In
type, when used in a schema has special meaning within Mongoose. If your schema requires usingtypeas a nested property you must use object notation: newSchema({broken:{type:Boolean},asset:{name:String,type:String// uh oh, it broke. asset will be interpreted as String}});newSchema({works...
Returns true if Mongoose can cast the given value to an ObjectId, or false otherwise. Example: mongoose.isValidObjectId(new mongoose.Types.ObjectId()); // true mongoose.isValidObjectId('0123456789ab'); // true mongoose.isValidObjectId(6); // falseMongoose...
Mongoose assigns each of your schemas an _id field by default if one is not passed into the Schema constructor. The type assigned is an ObjectId to coincide with MongoDB's default behavior. If you don't want an _id added to your schema at all, you may disable it using this option....
ObjectIdsmquery clones query arguments before passing them to a collection method for execution. This prevents accidental side-affects to the objects you pass. To clone ObjectIds we need to make some assumptions.First, to check if an object is an ObjectId, we check its constructors name. ...
{ type: mongoose.Schema.Types.ObjectId, ref: 'Post' }] }); const User = mongoose.model('User', userSchema); const Post = mongoose.model('Post', postSchema); // 查询用户信息,并填充关联的帖子数据 User.findOne({ name: 'John' }) .populate('posts') .exec((err, user) => { if ...
String、Number、Date、Buffer、Boolean、Mixed、ObjectId(要指定类型为 ObjectId,在声明中使用Schema.Types.ObjectId) 、Array、Decimal128 2、required 布尔值或函数 如果值为真,为此属性添加 required 验证器。 3、default: 任何值或函数 设置此路径默认值。如果是函数,函数返回值为默认值。
ObjectId数据类型通常指定到数据库中另一个文档的链接。 例如,如果您有书籍和作者的集合,则书籍文档可能包含一个ObjectId属性,该属性引用文档的特定作者。 Array数据类型允许您存储类似JavaScript的数组。 使用Array数据类型,您可以对它们执行常见JavaScript数组操作,例如推,弹出,移位,切片等。
constSchema=mongoose.Schema;constObjectId=Schema.ObjectId;constBlogPost=newSchema({author:ObjectId,title:String,body:String,date:Date}); Aside from defining the structure of your documents and the types of data you're storing, a Schema handles the definition of: ...
That's it. Now you can create book entities at will and they will have an _id field added of type Number and will automatically increment with each new document. Even declaring references is easy, just remember to change the reference property's type to Number instead of ObjectId if the ...