CODEWITHSUNDEEP
node.jsmongodb
Turqus
Turqus

Reputation: 117

How to create reference in Model Schema in mongoose

If I have model Products:

var ProductSchema = new Schema({
  title: {
    type: String,
    maxlength: 20,
    required: true
},
  description: {
    type: String,
    maxlength: 300
  },
  price: Number,
  active: Boolean,
  category: {

  }
});

And I must create category, type ObjectID with reference to category model I create right now this:

var CategorySchema = new Schema({
  name: {
    type: String,
    maxlength: 300
},
  description: {
    type: String,
    maxlength: 300
  }
});

Can someone what to do now? Because i do not know how.

Upvotes: 0

Views: 1118

Answers (1)

Ninja
Ninja

Reputation: 496

The category object in the schema should be as following:

category: { 
  type: Schema.Types.ObjectId, 
  ref: 'Category' //category model name
}

For more information about references you should read the following paragraph:

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. By including these names, DBRefs allow documents located in multiple collections to be more easily linked with documents from a single collection. To resolve DBRefs, your application must perform additional queries to return the referenced documents like population queries.

Upvotes: 3

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