How to load referenced document in Mongoose?-CodePudding

I have a MongoDB collection called categories which has a self-reference(parent) like follows.

const schema = mongoose.Schema({
    name: String,
    parent: {
        type: mongoose.Schema.Types.ObjectId,
        ref: 'Category',
    }
});

export default mongoose.model('Category', schema);

When i query it just returns the object id of the referenced document.

{ "_id": "63731fe1ce1bf2f534f9307e", "name": "Glass cleaners", "parent": "63731fbbce1bf2f534f9307d", }


I want to load the document referenced by `parent`, so i used following code to load the parent seperatly.

let parentCat = await Category.findOne({ _id: category.parent });


Is there an easy way of doing this because above is bit difficult to maintain if in my opinion.

Thanks

CodePudding user response：

You can use query population in mongoose instead of querying parent again.

https://mongoosejs.com/docs/populate.html

You have to call populate() when you query which will load parent document.

 Category.find().populate('parent');

Highly suggest you to go through the mongoose documentation.