populate module mongoose collection ref in javascript

To populate a mongoose collection ref using JavaScript, you can use the populate() function provided by mongoose.

Assuming you have two mongoose schemas A and B where A references B, and you want to populate the ref field in A, you would first query for A, and then use the populate() function to populate the ref field with the corresponding data from the B collection.

Here's an example:

index.tsx
const A = mongoose.model('A', { bId: { type: mongoose.Schema.Types.ObjectId, ref: 'B' } });
const B = mongoose.model('B', { name: String });

async function getA() {
  const a = await A.findOne({}).populate('bId');
  console.log(a);
}

getA();
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In this example, we define two mongoose models A and B, where A has a field bId that references the _id field of the B schema. We then define a function getA() that finds a document in the A collection using findOne(), and then uses the populate() function to populate the bId field with the corresponding data from the B collection. Finally, we log the result to the console.

You can modify the populate() function to suit your specific needs depending on your schema setup.