$rename operator for field names in MongoDB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to rename the field 'oldName' to 'newName' in a MongoDB update operation.

MongoDB

db.collection.updateOne({}, { $rename: { [1]: 'newName' } })

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

A'newName'

B'oldName'

C'old_name'

D'nameOld'

Attempts:

3 left

💡 Hint

Common Mistakes

Using the new field name as the key instead of the old field name.

Forgetting to put the field name in quotes.

The $rename operator requires the current field name as the key and the new field name as the value.

2fill in blank

medium

Complete the code to rename the field 'username' to 'user_name' in all documents.

MongoDB

db.collection.updateMany({}, { $rename: { [1]: 'user_name' } })

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

A'username'

B'user_name'

C'userName'

D'user-name'

Attempts:

3 left

💡 Hint

Common Mistakes

Using the new field name as the key.

Changing the case of the field name incorrectly.

The $rename operator needs the exact current field name as the key to rename it.

3fill in blank

hard

Fix the error in the code to rename 'address' to 'location' in one document.

MongoDB

db.collection.updateOne({}, { $rename: { address: [1] } })

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

Alocation

B'address'

Clocation'

D'location'

Attempts:

3 left

💡 Hint

Common Mistakes

Not putting the new field name in quotes.

Using unbalanced quotes.

The new field name must be a string inside quotes when used as the value in $rename.

4fill in blank

hard

Fill both blanks to rename 'phone' to 'contactNumber' in all documents.

MongoDB

db.collection.updateMany({}, { $rename: { [1]: [2] } })

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

A'phone'

B'contactNumber'

C'phoneNumber'

D'contact_number'

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping old and new field names.

Forgetting quotes around field names.

The $rename operator needs the old field name as the key and the new field name as the value, both as strings.

5fill in blank

hard

Fill all three blanks to rename 'email' to 'contactEmail' and 'dob' to 'dateOfBirth' in one update operation.

MongoDB

db.collection.updateMany({}, { $rename: { [1]: [2], [3]: 'dateOfBirth' } })

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

A'email'

B'contactEmail'

C'dob'

D'dateOfBirth'

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up old and new field names.

Not quoting field names properly.

Use $rename with old field names as keys and new field names as values, all as strings.