How do you reference another schema?

How do you reference another schema?

First of all you have to make a small change to your postSchema, refer the following schema structure:

1. var postSchema = new Schema({
2. name: String,
3. postedBy: {type: mongoose.Schema.Types.ObjectId, ref: ‘User’},
4. dateCreated: Date,
5. comments: [{body:”string”, by: mongoose.Schema.Types.ObjectId}],
6. });

What is ref in mongoose schema?

The ref option is what tells Mongoose which model to use during population, in our case the Story model. All _id s we store here must be document _id s from the Story model. Note: ObjectId , Number , String , and Buffer are valid for use as refs.

How do I reference a different model in MongoDB?

MongoDB applications use one of two methods for relating documents:

1. Manual references where you save the _id field of one document in another document as a reference.
2. DBRefs are references from one document to another using the value of the first document’s _id field, collection name, and, optionally, its database name.

Can I import a mongoose?

Installing and importing mongoose in Nodejs js”. In this file, we will import mongoose. Any package can be imported in a NodeJs file by using the require keyword and passing the package name in single quotes.

What is ref schema?

In a JSON schema, a $ref keyword is a JSON Pointer to a schema, or a type or property in a schema. A JSON pointer takes the form of A # B in which: A is the relative path from the current schema to a target schema. If A is empty, the reference is to a type or property in the same schema, an in-schema reference.

What is path in mongoose?

Schema Paths and Casting The first parameter to the Schema class constructor is a definition object. This object defines what paths a schema has. For example, the below userSchema has a name path and an age path. const userSchema = new mongoose. Schema({ name: String, age: Number }); const UserModel = mongoose.

What is the use of populate in mongoose?

populate() function in mongoose is used for populating the data inside the reference. In your example StorySchema is having _creator field which will reference to the _id field which is basically the ObjectId of the mongodb document. populate() function can accept a string or an object as an input.

Which model is used to describe reference relationships between documents?

Model Relationships Between Documents¶ Presents a data model that uses references to describe one-to-many relationships between documents.

Does MongoDB have relationships?

Relationships in MongoDB represent how various documents are logically related to each other. Relationships can be modeled via Embedded and Referenced approaches. Such relationships can be either 1:1, 1:N, N:1 or N:N.

What eats a mongoose?

Predators of Mongooses include hawks, snakes, and jackals.

Should I use Mongodb or mongoose?

So if you wanna go for a multitenant application, go for mongodb native driver. mongo-db is likely not a great choice for new developers. On the other hand mongoose as an ORM (Object Relational Mapping) can be a better choice for the new-bies.

How do I reference a JSON Schema?