User: delete many mongodb with _id
Assistant: To delete multiple documents in MongoDB by their `_id` values, you can use the `deleteMany` method along with the `$in` operator. Here's a step-by-step guide on how to achieve this:

1. **Ensure Proper Connection**: Make sure you are connected to your MongoDB database.

2. **Prepare the List of `_id` Values**: Create an array containing the `_id` values of the documents you want to delete. Remember that the `_id` values are typically `ObjectId` types.

3. **Use `deleteMany` with `$in`**: Execute the `deleteMany` function with a query that uses the `$in` operator to match any of the given `_id` values.

Here is an example using Node.js with the `mongodb` driver:

```javascript
const { MongoClient, ObjectId } = require('mongodb');

async function deleteDocuments() {
    const uri = "your_mongodb_connection_uri"; // Replace with your MongoDB URI
    const client = new MongoClient(uri, { useNewUrlParser: true, useUnifiedTopology: true });

    try {
        await client.connect();
        const database = client.db('your_database_name'); // Replace with your database name
        const collection = database.collection('your_collection_name'); // Replace with your collection name

        // List of _id values for documents you want to delete
        const idsToDelete = [
            ObjectId('60d5ec49f8b9f700159e619d'),
            ObjectId('60d5ec49f8b9f700159e619e'),
            // Add more ObjectId values as needed
        ];

        // Delete documents
        const result = await collection.deleteMany({
            _id: { $in: idsToDelete }
        });

        console.log(`${result.deletedCount} documents were deleted.`);
    } catch (error) {
        console.error('Error deleting documents:', error);
    } finally {
        await client.close();
    }
}

deleteDocuments().catch(console.dir);
```

### Important Notes:

- Replace `"your_mongodb_connection_uri"`, `your_database_name`, and `your_collection_name` with your specific MongoDB URI, database name, and collection name.
- The `ObjectId` function is used to ensure the IDs are in the correct format. If your `_id` values are not of type `ObjectId`, simply list them as strings or the appropriate type.
- As always, use caution when deleting data to avoid accidental loss of important information. Consider running tests on a development or staging environment first to verify your commands perform as expected.
User: Class constructor ObjectId cannot be invoked without 'new'
Assistant: The error "Class constructor ObjectId cannot be invoked without 'new'" indicates that the `ObjectId` function must be called as a constructor with the `new` keyword. This is a common mistake when working with MongoDB's `ObjectId`. Here's how you can fix this issue:

Use the `new` keyword when creating an `ObjectId`. Here's the corrected example:

```javascript
const { MongoClient, ObjectId } = require('mongodb');

async function deleteDocuments() {
    const uri = "your_mongodb_connection_uri"; // Replace with your MongoDB URI
    const client = new MongoClient(uri, { useNewUrlParser: true, useUnifiedTopology: true });

    try {
        await client.connect();
        const database = client.db('your_database_name'); // Replace with your database name
        const collection = database.collection('your_collection_name'); // Replace with your collection name

        // List of _id values for documents you want to delete
        const idsToDelete = [
            new ObjectId('60d5ec49f8b9f700159e619d'),
            new ObjectId('60d5ec49f8b9f700159e619e'),
            // Add more ObjectId values as needed
        ];

        // Delete documents
        const result = await collection.deleteMany({
            _id: { $in: idsToDelete }
        });

        console.log(`${result.deletedCount} documents were deleted.`);
    } catch (error) {
        console.error('Error deleting documents:', error);
    } finally {
        await client.close();
    }
}

deleteDocuments().catch(console.dir);
```

### Key Adjustments:
- Ensure you create each `ObjectId` using `new ObjectId('your_id_here')`.
- Ensure your MongoDB connection URI, database name, and collection name are correctly specified.

By making these changes, you'll properly instantiate `ObjectId`s and be able to use them in the `deleteMany` query.
User: getting duplicate _id if using new ObjectId
Assistant: