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To modify an array of objects in Angular (Mongoose/MongoDB) that is a property of a model, you can follow these steps:

1. Fetch the original document from the database using the model's findOne() method or any other appropriate method.
2. Access the array property that needs to be modified.
3. Modify the array by using any of the array methods such as push(), pop(), splice(), etc. as per the requirement.
4. Save the modified document back to the database using the save() method.

Here's an example:

// Fetch the original document
Model.findOne({ _id: ObjectId("documentId") }, function(err, document) {
  if (err) throw err;

  // Access the array property
  const arrayToModify = document.arrayProperty;

  // Modify the array
  arrayToModify.push({ newItem: 'value' });

  // Save the modified document back to the database
  document.save(function(err, updatedDocument) {
    if (err) throw err;

    console.log(updatedDocument);
  });
});

Note that this example uses Mongoose syntax and assumes that you have established a connection to your MongoDB. Also, make sure to handle errors appropriately.