Deleting documents in Express - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to delete a document by ID using Express and Mongoose.

Express

app.delete('/items/:id', async (req, res) => {
  try {
    await Item.[1](req.params.id);
    res.send('Deleted successfully');
  } catch (error) {
    res.status(500).send(error.message);
  }
});

Drag options to blanks, or click blank then click option'

AfindByIdAndDelete

BdeleteOneById

CremoveById

DdeleteById

Attempts:

3 left

💡 Hint

Common Mistakes

Using a method that does not exist like 'removeById'.

Trying to delete without specifying the ID.

The findByIdAndDelete method deletes a document by its ID in Mongoose.

2fill in blank

medium

Complete the code to send a 404 status if the document to delete is not found.

Express

app.delete('/users/:id', async (req, res) => {
  const deletedUser = await User.findByIdAndDelete(req.params.id);
  if (![1]) {
    return res.status(404).send('User not found');
  }
  res.send('User deleted');
});

Drag options to blanks, or click blank then click option'

Areq.params.id

BdeletedUser

CUser

Dres

Attempts:

3 left

💡 Hint

Common Mistakes

Checking req.params.id instead of the deleted document.

Not handling the case when the document is not found.

We check if deletedUser is null or undefined to know if the user was found and deleted.

3fill in blank

hard

Fix the error in the code to delete a document using Express and Mongoose.

Express

app.delete('/posts/:id', async (req, res) => {
  try {
    const result = await Post.[1]({ _id: req.params.id });
    if (result.deletedCount === 0) {
      return res.status(404).send('Post not found');
    }
    res.send('Post deleted');
  } catch (err) {
    res.status(500).send(err.message);
  }
});

Drag options to blanks, or click blank then click option'

AdeleteOne

Bremove

CfindByIdAndDelete

DdeleteMany

Attempts:

3 left

💡 Hint

Common Mistakes

Using remove which is deprecated.

Using findByIdAndDelete which returns the deleted document, not a result with deletedCount.

The deleteOne method deletes a single document matching the filter and returns a result with deletedCount.

4fill in blank

hard

Fill both blanks to delete multiple documents matching a condition and send the count of deleted documents.

Express

app.delete('/tasks/completed', async (req, res) => {
  const result = await Task.[1]({ completed: true });
  res.send(`Deleted [2] completed tasks`);
});

Drag options to blanks, or click blank then click option'

AdeleteMany

Bcount

Cresult.deletedCount

Dfind

Attempts:

3 left

💡 Hint

Common Mistakes

Using find which only retrieves documents.

Trying to use count instead of deletedCount.

deleteMany deletes all documents matching the filter. The deletedCount property shows how many were deleted.

5fill in blank

hard

Fill all three blanks to delete a document by ID, handle errors, and send appropriate responses.

Express

app.delete('/comments/:id', async (req, res) => {
  try {
    const deleted = await Comment.[1](req.params.id);
    if (![2]) {
      return res.status(404).send('Comment not found');
    }
    res.[3]('Comment deleted');
  } catch (error) {
    res.status(500).send(error.message);
  }
});

Drag options to blanks, or click blank then click option'

AfindByIdAndDelete

Bdeleted

Csend

DdeleteOne

Attempts:

3 left

💡 Hint

Common Mistakes

Using deleteOne with ID directly (needs filter object).

Checking the wrong variable for deletion result.

Using res.sendStatus instead of res.send for success message.

Use findByIdAndDelete to delete by ID. Check if deleted is null to handle not found. Use send to send the response.