Ways to utilize populate with an array of ObjectId items

Question

Ways to utilize populate with an array of ObjectId items

I need to query a MongoDB database from NestJs to retrieve an object with the specific structure outlined below:

{  
 "_id": "64b89403e704cb73a2d42140",  
 "programs": [64b075f35742e25803cd2357, 64b075f35742e25803cd2357],
}

I have attempted the following methods:

  async getInstructors(): Promise<NotFoundException | Instructor[]> {
    const response = await this.instructorModel.find().populate('campus').populate({path: 'programs'}).exec();

However, both attempts resulted in an empty array being returned.

Is there a correct way to achieve this?

I am looking for the request to return an array containing the actual document data, rather than just the ObjectId.

typescript mongodb nestjs

Answer 1

Answer №1

After reviewing the structure of the object you provided, it appears that you are attempting to populate an array with references to other documents in the programas field. To populate the programas field with the actual documents rather than just ObjectIds, you can utilize the populate() method along with the path option to specify which field to populate and the model option to designate the Model for the referenced documents. Below is a sample code snippet demonstrating how you can adjust your query:

async getInstructors(): Promise<NotFoundException | Instructor[]> {
  const result = await this.instructorModel.find().populate('sede').populate({ path: 'programas', model: 'Programa' }).exec();
  return result;
}

In the provided example, 'Programa' represents the name of the Model associated with the referenced documents in the programas field. Make sure to replace it with the accurate name of your Model.

This modification should retrieve the documents with the populated programas field containing the actual documents instead of solely ObjectIds.

Answer 2

After reviewing the structure of the object you provided, it appears that you are attempting to populate an array with references to other documents in the programas field. To populate the programas field with the actual documents rather than just ObjectIds, you can utilize the populate() method along with the path option to specify which field to populate and the model option to designate the Model for the referenced documents. Below is a sample code snippet demonstrating how you can adjust your query:

async getInstructors(): Promise<NotFoundException | Instructor[]> {
  const result = await this.instructorModel.find().populate('sede').populate({ path: 'programas', model: 'Programa' }).exec();
  return result;
}

In the provided example, 'Programa' represents the name of the Model associated with the referenced documents in the programas field. Make sure to replace it with the accurate name of your Model.

This modification should retrieve the documents with the populated programas field containing the actual documents instead of solely ObjectIds.

Ways to utilize populate with an array of ObjectId items

Answer №1

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