Difference between new mongoose.schema and mongoose.schema
In Mongoose, mongoose.Schema
and new mongoose.Schema
are two different ways to create a schema, but they are equivalent in terms of functionality.
mongoose.Schema
mongoose.Schema
is a static method of the Mongoose module that returns a new schema object. When you call mongoose.Schema
, you are creating a new schema object that you can then use to define your model's structure.
Example:
const mongoose = require('mongoose');
const schema = mongoose.Schema({
name: String,
age: Number
});
In this example, mongoose.Schema
is called with an object literal that defines the schema's structure. The resulting schema
object can then be used to create a model.
new mongoose.Schema
new mongoose.Schema
is a constructor function that creates a new schema object. When you call new mongoose.Schema
, you are creating a new instance of the Schema
class, which is a subclass of Object
.
Example:
const mongoose = require('mongoose');
const schema = new mongoose.Schema({
name: String,
age: Number
});
In this example, new mongoose.Schema
is called with an object literal that defines the schema's structure. The resulting schema
object is an instance of the Schema
class and can be used to create a model.
Key differences
While both mongoose.Schema
and new mongoose.Schema
create a new schema object, there are some subtle differences:
mongoose.Schema
returns a static schema object, whereasnew mongoose.Schema
returns an instance of theSchema
class.mongoose.Schema
is a static method, whereasnew mongoose.Schema
is a constructor function.mongoose.Schema
is often used when you want to create a schema programmatically, whereasnew mongoose.Schema
is often used when you want to create a schema instance that can be used to create a model.
In practice, both approaches are equivalent, and you can use either one to create a schema. However, if you need to create multiple schema instances or want more control over the schema creation process, using new mongoose.Schema
might be a better choice.